DonalEvans commented on a change in pull request #6561:
URL: https://github.com/apache/geode/pull/6561#discussion_r652252991



##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);

Review comment:
       Warnings here can be fixed by using `Region<String, TestObject>`.

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }

Review comment:
       This block is reused in every test case. Would it be possible to pull it 
out into a `@Before` method?

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();

Review comment:
       These catch blocks all have the same behaviour, so they can be condensed 
into one:
   ```
           } catch (FunctionDomainException | TypeMismatchException | 
NameResolutionException
               | QueryInvocationTargetException e) {
             e.printStackTrace();
           }
   ```

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());

Review comment:
       Could this use AssertJ assertions instead of JUnit please:
   ```
   assertThat(numberOfEntries).isEqualTo(rs2.size());
   ```
   According to the Geode wiki page for writing DUnit tests, AssertJ is the 
preferred assertion library to use: 
https://cwiki.apache.org/confluence/display/GEODE/About+Distributed+Testing

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestPdxSerializable());
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName, hostName, hostName},
+        new int[] {port0, port1, port2}, true);
+
+    try {
+      vm3.invoke(() -> {
+        TestPdxSerializable.throwExceptionOnDeserialization = true;
+        QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+        logger.info("### Executing Query on server: " + queryString[1]);
+        Query query = remoteQueryService.newQuery(queryString[1]);
+        SelectResults rs2 = (SelectResults) query.execute();
+        assertEquals(numberOfEntries, rs2.size());

Review comment:
       Using AssertJ assertions, this would be 
`assertThat(numberOfEntries).isEqualTo(rs2.size());`

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);

Review comment:
       To fix some warnings here, this can be `Region<String, 
TestPdxSerializable>`

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestPdxSerializable());
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";

Review comment:
       This String is used in all the test cases. Could it be extracted to a 
constant?

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);

Review comment:
       Could these be renamed to make it clearer which are the servers and 
which are the clients?

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);

Review comment:
       To fix warnings about parameterized types, this can be 
`SelectResults<TestObject>`.

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }

Review comment:
       To clean up some warnings, a List can be used instead of an array here, 
which would turn this into:
   ```
       List<AsyncInvocation<Void>> asyncInvocationArray = new ArrayList<>();
       for (int i = 0; i < size; i++) {
         asyncInvocationArray.add(
             vm3.invokeAsync(() -> {
               QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
               logger.info("### Executing Query on server: " + queryString[1]);
               Query query = remoteQueryService.newQuery(queryString[1]);
               SelectResults<TestObject> rs2 = uncheckedCast(query.execute());
               assertThat(numberOfEntries).isEqualTo(rs2.size());
             }));
       }
   
       for (AsyncInvocation<Void> invocation : asyncInvocationArray) {
         invocation.await();
       }
   ```

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {

Review comment:
       This can be simplified to:
   ```
   IntStream.range(0, size).parallel().forEach(a -> {
   ```

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestPdxSerializable());
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName, hostName, hostName},
+        new int[] {port0, port1, port2}, true);
+
+    try {

Review comment:
       What's the purpose of the try/finally block here? When I remove it, the 
test still passes. If they're not necessary, the two `vm3.invoke()` calls can 
be combined to one, which simplifies things a bit.

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);

Review comment:
       This step is repeated at the end of every test case. Could it be moved 
to an `@After` method?

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();

Review comment:
       This variable is not used and can be removed.

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);

Review comment:
       If using `Region<String, TestObject>` to fix warnings, this becomes:
   ```
         Region<String, TestObject> region = clientCache
             .<String, 
TestObject>createClientRegionFactory(ClientRegionShortcut.PROXY)
             .create(regionName);
   ```

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);

Review comment:
       To fix warnings, this can be `Region<String, TestObject>`

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestPdxSerializable());
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName, hostName, hostName},
+        new int[] {port0, port1, port2}, true);
+
+    try {
+      vm3.invoke(() -> {
+        TestPdxSerializable.throwExceptionOnDeserialization = true;
+        QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+        logger.info("### Executing Query on server: " + queryString[1]);
+        Query query = remoteQueryService.newQuery(queryString[1]);
+        SelectResults rs2 = (SelectResults) query.execute();

Review comment:
       Warnings here can be fixed by using: 
   ```
           SelectResults<TestPdxSerializable> rs2 = 
uncheckedCast(query.execute());
   ```

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {

Review comment:
       `InterruptedException` is never thrown here, so that can be removed.

##########
File path: 
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxMultiThreadQueryDUnitTest.java
##########
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.cache.query.dunit;
+
+import static org.apache.geode.test.awaitility.GeodeAwaitility.await;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.logging.log4j.Logger;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import org.apache.geode.cache.CacheException;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientCache;
+import org.apache.geode.cache.client.ClientCacheFactory;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+import org.apache.geode.cache.client.PoolManager;
+import org.apache.geode.cache.query.FunctionDomainException;
+import org.apache.geode.cache.query.NameResolutionException;
+import org.apache.geode.cache.query.Query;
+import org.apache.geode.cache.query.QueryInvocationTargetException;
+import org.apache.geode.cache.query.QueryService;
+import org.apache.geode.cache.query.SelectResults;
+import org.apache.geode.cache.query.TypeMismatchException;
+import org.apache.geode.logging.internal.log4j.api.LogService;
+import org.apache.geode.pdx.PdxReader;
+import org.apache.geode.pdx.PdxSerializable;
+import org.apache.geode.pdx.PdxSerializationException;
+import org.apache.geode.pdx.PdxWriter;
+import org.apache.geode.test.dunit.AsyncInvocation;
+import org.apache.geode.test.dunit.Host;
+import org.apache.geode.test.dunit.NetworkUtils;
+import org.apache.geode.test.dunit.VM;
+import org.apache.geode.test.junit.categories.OQLQueryTest;
+import org.apache.geode.test.version.VersionManager;
+
+@Category({OQLQueryTest.class})
+public class PdxMultiThreadQueryDUnitTest extends PDXQueryTestBase {
+  public static final Logger logger = LogService.getLogger();
+
+  static final int numberOfEntries = 100;
+
+  public PdxMultiThreadQueryDUnitTest() {
+    super();
+  }
+
+  @Test
+  public void testClientServerQuery() throws CacheException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client region
+    vm3.invoke(() -> {
+      ClientCacheFactory cf = new ClientCacheFactory();
+      cf.addPoolServer(hostName, port1);
+      cf.addPoolServer(hostName, port2);
+      cf.addPoolServer(hostName, port0);
+      cf.setPdxReadSerialized(false);
+      ClientCache clientCache = getClientCache(cf);
+      Region region =
+          
clientCache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
+
+      logger.info("### Executing Query on server: " + queryString[1] + ": from 
client region: "
+          + region.getFullPath());
+      final int size = 100;
+      int[] array = new int[size];
+      for (int i = 0; i < size; i++) {
+        array[i] = i;
+      }
+      Arrays.stream(array).parallel().forEach(a -> {
+        try {
+          SelectResults rs2 = region.query(queryString[1]);
+          assertEquals(numberOfEntries, rs2.size());
+        } catch (FunctionDomainException e) {
+          e.printStackTrace();
+        } catch (TypeMismatchException e) {
+          e.printStackTrace();
+        } catch (NameResolutionException e) {
+          e.printStackTrace();
+        } catch (QueryInvocationTargetException e) {
+          e.printStackTrace();
+        }
+      });
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testClientServerQueryUsingRemoteQueryService()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestObject(i, "vmware"));
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName}, new int[] {port1, 
port2, port0}, true);
+
+    final int size = 100;
+    AsyncInvocation[] asyncInvocationArray = new AsyncInvocation[size];
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i] =
+          vm3.invokeAsync(() -> {
+            ClientCache clientCache = getClientCache();
+            QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+            logger.info("### Executing Query on server: " + queryString[1]);
+            Query query = remoteQueryService.newQuery(queryString[1]);
+            SelectResults rs2 = (SelectResults) query.execute();
+            assertEquals(numberOfEntries, rs2.size());
+          });
+    }
+
+    for (int i = 0; i < size; i++) {
+      asyncInvocationArray[i].await();
+    }
+    vm3.invoke(() -> {
+      await().until(() -> TestObject.numInstance.get() == size * 
numberOfEntries);
+    });
+
+    this.closeClient(vm3);
+    this.closeClient(vm2);
+    this.closeClient(vm1);
+    this.closeClient(vm0);
+  }
+
+  @Test
+  public void testRetryWithPdxSerializationException()
+      throws CacheException, InterruptedException {
+    final Host host = Host.getHost(0);
+    final String hostName = NetworkUtils.getServerHostName();
+
+    VM vm0 = host.getVM(VersionManager.CURRENT_VERSION, 0);
+    VM vm1 = host.getVM(VersionManager.CURRENT_VERSION, 1);
+    VM vm2 = host.getVM(VersionManager.CURRENT_VERSION, 2);
+    VM vm3 = host.getVM(VersionManager.CURRENT_VERSION, 3);
+
+    // Start servers
+    for (VM vm : Arrays.asList(vm0, vm1, vm2)) {
+      vm.invoke(() -> {
+        configAndStartBridgeServer();
+      });
+    }
+
+    // create pdx instance at servers
+    vm0.invoke(() -> {
+      Region region = getRootRegion().getSubregion(regionName);
+      for (int i = 0; i < numberOfEntries; i++) {
+        region.put("key-" + i, new TestPdxSerializable());
+      }
+    });
+
+    final int port0 = vm0.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port1 = vm1.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+    final int port2 = vm2.invoke(() -> PdxQueryDUnitTest.getCacheServerPort());
+
+    // Create client pool.
+    final String poolName = "testClientServerQueryPool";
+    createPool(vm3, poolName, new String[] {hostName, hostName, hostName},
+        new int[] {port0, port1, port2}, true);
+
+    try {
+      vm3.invoke(() -> {
+        TestPdxSerializable.throwExceptionOnDeserialization = true;
+        QueryService remoteQueryService = 
(PoolManager.find(poolName)).getQueryService();
+        logger.info("### Executing Query on server: " + queryString[1]);
+        Query query = remoteQueryService.newQuery(queryString[1]);
+        SelectResults rs2 = (SelectResults) query.execute();
+        assertEquals(numberOfEntries, rs2.size());
+      });
+    } finally {
+      vm3.invoke(() -> {
+        assertEquals(false, 
TestPdxSerializable.throwExceptionOnDeserialization);
+        // the failed try will increment numInstance once
+        assertEquals(numberOfEntries + 1, 
TestPdxSerializable.numInstance.get());

Review comment:
       Using AssertJ assertions here, these would become:
   ```
           
assertThat(TestPdxSerializable.throwExceptionOnDeserialization).isFalse();
           // the failed try will increment numInstance once
           assertThat(numberOfEntries + 
1).isEqualTo(TestPdxSerializable.numInstance.get());
   ```




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