TestZookeeperExternalSessionsRegistryClient

Author: abstractdog

ql/src/test/org/apache/hadoop/hive/ql/exec/tez/TestZookeeperExternalSessionsRegistryClient.java

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+/*
+ * 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.hadoop.hive.ql.exec.tez;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.curator.framework.CuratorFrameworkFactory;
+import org.apache.curator.retry.RetryOneTime;
+import org.apache.curator.test.TestingServer;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
+import org.junit.Test;
+
+/**
+ * Tests for {@link ZookeeperExternalSessionsRegistryClient}.
+ */
+public class TestZookeeperExternalSessionsRegistryClient {
+
+  /**
+   * Integration-style unit test that ensures {@link ZookeeperExternalSessionsRegistryClient}
+   * can discover sessions from ZooKeeper and hand them out via {@link ExternalSessionsRegistry#getSession()}.
+   */
+  @Test
+  public void testGetAndReturnSession() throws Exception {
+    TestingServer server = null;
+    CuratorFramework client = null;
+    ZookeeperExternalSessionsRegistryClient registry = null;
+    try {
+      server = new TestingServer();
+      String connectString = server.getConnectString();
+
+      HiveConf conf = new HiveConf();
+      conf.setVar(ConfVars.HIVE_ZOOKEEPER_QUORUM, connectString);
+      conf.setVar(ConfVars.HIVE_SERVER2_TEZ_EXTERNAL_SESSIONS_NAMESPACE, "/tez_ns");
+      conf.setIntVar(ConfVars.HIVE_SERVER2_TEZ_EXTERNAL_SESSIONS_WAIT_MAX_ATTEMPTS, 1);
+
+      String namespace = HiveConf.getVar(conf, ConfVars.HIVE_SERVER2_TEZ_EXTERNAL_SESSIONS_NAMESPACE);
+      String effectivePath = namespace + "/tez_am/server";
+
+      CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder();
+      client = builder.connectString(connectString).retryPolicy(new RetryOneTime(1)).build();
+      client.start();
+
+      client.create().creatingParentsIfNeeded().forPath(effectivePath + "/app_1");
+      client.create().forPath(effectivePath + "/app_2");
+
+      registry = new ZookeeperExternalSessionsRegistryClient(conf);
+
+      String first = registry.getSession();
+      assertTrue(first.equals("app_1") || first.equals("app_2"));
+
+      registry.returnSession(first);
+      String second = registry.getSession();
+      assertNotNull(second);
+      assertTrue(second.equals("app_1") || second.equals("app_2"));
+    } finally {
+      if (registry != null) {
+        registry.close();
+      }
+      if (client != null) {
+        client.close();
+      }
+      if (server != null) {
+        server.close();
+      }
+    }
+  }
+
+  /**
+   * Verifies that the same external session ID can be obtained and returned
+   * multiple times in a row from {@link ZookeeperExternalSessionsRegistryClient}.
+   */
+  @Test
+  public void testReuseSameSession() throws Exception {
+    TestingServer server = null;
+    CuratorFramework client = null;
+    ZookeeperExternalSessionsRegistryClient registry = null;
+    try {
+      server = new TestingServer();
+      String connectString = server.getConnectString();
+
+      HiveConf conf = new HiveConf();
+      conf.setVar(ConfVars.HIVE_ZOOKEEPER_QUORUM, connectString);
+      conf.setVar(ConfVars.HIVE_SERVER2_TEZ_EXTERNAL_SESSIONS_NAMESPACE, "/tez_ns_reuse");
+      conf.setIntVar(ConfVars.HIVE_SERVER2_TEZ_EXTERNAL_SESSIONS_WAIT_MAX_ATTEMPTS, 1);
+
+      String namespace = HiveConf.getVar(conf, ConfVars.HIVE_SERVER2_TEZ_EXTERNAL_SESSIONS_NAMESPACE);
+      String effectivePath = namespace + "/tez_am/server";
+
+      CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder();
+      client = builder.connectString(connectString).retryPolicy(new RetryOneTime(1)).build();
+      client.start();
+
+      client.create().creatingParentsIfNeeded().forPath(effectivePath + "/app_reuse");
+
+      registry = new ZookeeperExternalSessionsRegistryClient(conf);
+
+      String first = registry.getSession();
+      assertEquals("app_reuse", first);
+
+      registry.returnSession(first);
+      String second = registry.getSession();
+      assertEquals("app_reuse", second);
+
+      registry.returnSession(second);
+      String third = registry.getSession();
+      assertEquals("app_reuse", third);
+    } finally {
+      if (registry != null) {
+        registry.close();
+      }
+      if (client != null) {
+        client.close();
+      }
+      if (server != null) {
+        server.close();
+      }
+    }
+  }
+}
+