sanjeet006py commented on code in PR #2169:
URL: https://github.com/apache/phoenix/pull/2169#discussion_r2143120355


##########
phoenix-core/src/it/java/org/apache/phoenix/monitoring/CQSIThreadPoolMetricsIT.java:
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@@ -0,0 +1,250 @@
+/*
+ * 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.phoenix.monitoring;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.phoenix.end2end.NeedsOwnMiniClusterTest;
+import org.apache.phoenix.jdbc.AbstractRPCConnectionInfo;
+import org.apache.phoenix.jdbc.ConnectionInfo;
+import org.apache.phoenix.jdbc.ZKConnectionInfo;
+import org.apache.phoenix.query.ConfigurationFactory;
+import org.apache.phoenix.query.QueryServices;
+import org.apache.phoenix.util.InstanceResolver;
+import org.apache.phoenix.util.PhoenixRuntime;
+import org.apache.phoenix.util.QueryUtil;
+import org.apache.phoenix.util.ReadOnlyProps;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+import static 
org.apache.phoenix.jdbc.ConnectionInfo.CLIENT_CONNECTION_REGISTRY_IMPL_CONF_KEY;
+import static org.apache.phoenix.query.QueryServices.CQSI_THREAD_POOL_ENABLED;
+import static 
org.apache.phoenix.query.QueryServices.CQSI_THREAD_POOL_METRICS_ENABLED;
+import static 
org.apache.phoenix.query.QueryServicesOptions.DEFAULT_QUERY_SERVICES_NAME;
+
+@Category(NeedsOwnMiniClusterTest.class)
+@RunWith(Parameterized.class)
+public class CQSIThreadPoolMetricsIT extends BaseHTableThreadPoolMetricsIT {
+
+    private final String registryClassName;
+    private final Properties props = new Properties();
+
+    public CQSIThreadPoolMetricsIT(String registryClassName) {
+        this.registryClassName = registryClassName;
+    }
+
+    @BeforeClass
+    public static void setUp() throws Exception {
+        final Configuration conf = HBaseConfiguration.create();
+        setUpConfigForMiniCluster(conf);
+        conf.setBoolean(CQSI_THREAD_POOL_METRICS_ENABLED, true);
+        conf.setBoolean(CQSI_THREAD_POOL_ENABLED, true);
+
+        InstanceResolver.clearSingletons();
+        // Override to get required config for static fields loaded that 
require HBase config
+        InstanceResolver.getSingleton(ConfigurationFactory.class, new 
ConfigurationFactory() {
+
+            @Override public Configuration getConfiguration() {
+                return conf;
+            }
+
+            @Override public Configuration getConfiguration(Configuration 
confToClone) {
+                Configuration copy = new Configuration(conf);
+                copy.addResource(confToClone);
+                return copy;
+            }
+        });
+
+        Map<String, String> props = new HashMap<>();
+        props.put(QueryServices.TESTS_MINI_CLUSTER_NUM_MASTERS, "2");
+        setUpTestDriver(new ReadOnlyProps(props));
+    }
+
+    @Before
+    public void testCaseSetup() {
+        props.setProperty(CLIENT_CONNECTION_REGISTRY_IMPL_CONF_KEY, 
registryClassName);
+    }
+
+    @After
+    public void cleanup() throws Exception {
+        driver.cleanUpCQSICache();
+        HTableThreadPoolMetricsManager.clearHTableThreadPoolHistograms();
+        props.clear();
+    }
+
+    @Parameterized.Parameters(name = 
"ExternalHTableThreadPoolMetricsIT_registryClassName={0}")
+    public synchronized static Collection<String> data() {
+        return Arrays.asList(ZKConnectionInfo.ZK_REGISTRY_NAME,
+                "org.apache.hadoop.hbase.client.RpcConnectionRegistry",
+                "org.apache.hadoop.hbase.client.MasterRegistry");
+    }
+
+    @Test
+    public void testHistogramsPerConnInfo() throws Exception {
+        String tableName = generateUniqueName();
+        String histogramKey;
+        String cqsiNameService1 = "service1";
+        String cqsiNameService2 = "service2";
+
+        // Create a connection for "service1" connection profile
+        String url = QueryUtil.getConnectionUrl(props, 
utility.getConfiguration(),
+                cqsiNameService1);
+        Map<String, List<HistogramDistribution>> htableThreadPoolHistograms;
+        try (Connection conn = driver.connect(url, props)) {
+            createTableAndUpsertData(conn, tableName);
+
+            htableThreadPoolHistograms = runQueryAndGetHistograms(conn, 
tableName);
+
+            histogramKey = getHistogramKey(url);
+            assertHTableThreadPoolUsed(htableThreadPoolHistograms, 
histogramKey);
+            Map<String, String> expectedTagKeyValues = 
getExpectedTagKeyValues(url,
+                    cqsiNameService1);
+            assertHistogramTags(htableThreadPoolHistograms, 
expectedTagKeyValues, histogramKey);
+        }
+
+        // Create a connection for "service2" connection profile
+        url = QueryUtil.getConnectionUrl(props, utility.getConfiguration(), 
cqsiNameService2);
+        htableThreadPoolHistograms = 
PhoenixRuntime.getHTableThreadPoolHistograms();
+        // Assert that HTableThreadPoolHistograms for service2 is not there yet
+        
Assert.assertNull(htableThreadPoolHistograms.get(getHistogramKey(url)));
+        try (Connection conn = driver.connect(url, props)) {
+            htableThreadPoolHistograms = runQueryAndGetHistograms(conn, 
tableName);
+
+            assertHTableThreadPoolNotUsed(htableThreadPoolHistograms, 
histogramKey);
+            Map<String, String> expectedTagKeyValues = 
getExpectedTagKeyValues(url,
+                    cqsiNameService1);
+            assertHistogramTags(htableThreadPoolHistograms, 
expectedTagKeyValues, histogramKey);

Review Comment:
   Yes, I am asserting on old tags to make sure they are still there in 
histogram correponding to `service1`. I wanted to check this to make sure using 
new CQSI instance with new principal is not messing up old tags of old 
principal.



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