ezoerner commented on a change in pull request #6925:
URL: https://github.com/apache/geode/pull/6925#discussion_r721792976



##########
File path: 
geode-apis-compatible-with-redis/src/distributedTest/java/org/apache/geode/redis/internal/executor/string/MSetNXDUnitTest.java
##########
@@ -0,0 +1,174 @@
+/*
+ * 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.redis.internal.executor.string;
+
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.BIND_ADDRESS;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.REDIS_CLIENT_TIMEOUT;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.List;
+import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Ignore;
+import org.junit.Test;
+import redis.clients.jedis.HostAndPort;
+import redis.clients.jedis.JedisCluster;
+
+import org.apache.geode.cache.control.RebalanceFactory;
+import org.apache.geode.cache.control.ResourceManager;
+import org.apache.geode.redis.ConcurrentLoopingThreads;
+import org.apache.geode.test.dunit.rules.ClusterStartupRule;
+import org.apache.geode.test.dunit.rules.MemberVM;
+import org.apache.geode.test.dunit.rules.RedisClusterStartupRule;
+import org.apache.geode.test.junit.rules.ExecutorServiceRule;
+
+public class MSetNXDUnitTest {
+
+  @ClassRule
+  public static RedisClusterStartupRule clusterStartUp = new 
RedisClusterStartupRule(4);
+
+  @ClassRule
+  public static ExecutorServiceRule executor = new ExecutorServiceRule();
+
+  private static final String HASHTAG = "{tag}";
+  private static JedisCluster jedis;
+  private static MemberVM server1;
+  private static int locatorPort;
+
+  private static MemberVM locator;
+
+  @BeforeClass
+  public static void classSetup() {
+    locator = clusterStartUp.startLocatorVM(0);
+    locatorPort = locator.getPort();
+    server1 = clusterStartUp.startRedisVM(1, locatorPort);
+    clusterStartUp.startRedisVM(2, locatorPort);
+    clusterStartUp.startRedisVM(3, locatorPort);
+
+    int redisServerPort1 = clusterStartUp.getRedisPort(1);
+    jedis = new JedisCluster(new HostAndPort(BIND_ADDRESS, redisServerPort1), 
REDIS_CLIENT_TIMEOUT);
+  }
+
+  @After
+  public void after() {
+    clusterStartUp.flushAll();
+  }
+
+  @AfterClass
+  public static void tearDown() {
+    jedis.close();
+  }
+
+  @Test
+  public void testMSetnx_concurrentInstancesHandleBucketMovement() {
+    int KEY_COUNT = 5000;
+    String[] keys = new String[KEY_COUNT];
+
+    for (int i = 0; i < keys.length; i++) {
+      keys[i] = HASHTAG + "key" + i;
+    }
+    String[] keysAndValues1 = makeKeysAndValues(keys, "valueOne");
+    String[] keysAndValues2 = makeKeysAndValues(keys, "valueTwo");
+
+    new ConcurrentLoopingThreads(100,
+        i -> jedis.msetnx(keysAndValues1),
+        i -> jedis.msetnx(keysAndValues2),
+        i -> clusterStartUp.moveBucketForKey(keys[0]))
+            .runWithAction(() -> {
+              assertThat(jedis.mget(keys)).satisfiesAnyOf(
+                  values -> assertThat(values)
+                      .allSatisfy(value -> 
assertThat(value).startsWith("valueOne")),
+                  values -> assertThat(values)
+                      .allSatisfy(value -> 
assertThat(value).startsWith("valueTwo")));
+              jedis.del(keys);
+            });
+  }
+
+  @Ignore("GEODE-9604")
+  @Test
+  public void testMSetnx_crashDoesNotLeaveInconsistencies() throws Exception {
+    int KEY_COUNT = 1000;
+    String[] keys = new String[KEY_COUNT];
+
+    for (int i = 0; i < keys.length; i++) {
+      keys[i] = HASHTAG + "key" + i;
+    }
+    String[] keysAndValues1 = makeKeysAndValues(keys, "valueOne");
+    String[] keysAndValues2 = makeKeysAndValues(keys, "valueTwo");
+    AtomicBoolean running = new AtomicBoolean(true);
+
+    Future<?> future = executor.submit(() -> {
+      for (int i = 0; i < 20 && running.get(); i++) {
+        clusterStartUp.moveBucketForKey(keys[0], "server-3");
+        // Sleep for a bit so that MSETs can execute
+        Thread.sleep(2000);

Review comment:
       Yeah, I was looking sideways at that sleep also, but in the interest in 
getting this ticket out of the critical path, I'm inclined to leave this for 
now. If you think this is important enough that it should be changed, can you 
open a ticket for it? Thanks.




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