goiri commented on a change in pull request #1399: HADOOP-16543: Cached DNS name resolution error URL: https://github.com/apache/hadoop/pull/1399#discussion_r331669429
########## File path: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/TestNoHaRMFailoverProxyProvider.java ########## @@ -0,0 +1,286 @@ + + +/** + * 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 + * <p> + * http://www.apache.org/licenses/LICENSE-2.0 + * <p> + * 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.yarn.client; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.io.retry.FailoverProxyProvider; +import org.apache.hadoop.yarn.api.ApplicationClientProtocol; +import org.apache.hadoop.yarn.api.records.NodeReport; +import org.apache.hadoop.yarn.client.api.YarnClient; +import org.apache.hadoop.yarn.conf.YarnConfiguration; +import org.apache.hadoop.yarn.exceptions.YarnException; +import org.apache.hadoop.yarn.server.MiniYARNCluster; +import org.junit.Before; +import org.junit.Test; + +import java.io.Closeable; +import java.io.IOException; +import java.lang.reflect.InvocationHandler; +import java.lang.reflect.Proxy; +import java.net.InetSocketAddress; +import java.util.List; + +import static org.junit.Assert.*; +import static org.mockito.Mockito.any; +import static org.mockito.Mockito.eq; +import static org.mockito.Mockito.times; +import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.verify; +import static org.mockito.Mockito.when; + +/** + * Unit tests for {@link DefaultNoHARMFailoverProxyProvider} and + * {@link AutoRefreshNoHARMFailoverProxyProvider}. + */ +public class TestNoHaRMFailoverProxyProvider { + private final int numNodeManagers = 1; + private Configuration conf; + + @Before + public void setUp() throws IOException, YarnException { + conf = new YarnConfiguration(); + } + + /** + * Tests the proxy generated by {@link DefaultNoHAFailoverProxyProvider} + * will connect to RM. + */ + @Test + public void testRestartedRM() throws Exception { + MiniYARNCluster cluster = + new MiniYARNCluster("testRestartedRMNegative", numNodeManagers, 1, 1); + YarnClient rmClient = YarnClient.createYarnClient(); + try { + cluster.init(conf); + cluster.start(); + final Configuration yarnConf = cluster.getConfig(); + rmClient = YarnClient.createYarnClient(); + rmClient.init(yarnConf); + rmClient.start(); + List <NodeReport> nodeReports = rmClient.getNodeReports(); + assertEquals( + "The proxy didn't get expected number of node reports", + numNodeManagers, nodeReports.size()); + } finally { + if (rmClient != null) { + rmClient.stop(); + } + cluster.stop(); + } + } + + /** + * Tests the proxy generated by + * {@link AutoRefreshNoHARMFailoverProxyProvider} will connect to RM. + */ + @Test + public void testConnectingToRM() throws Exception { + conf.setClass(YarnConfiguration.CLIENT_FAILOVER_NO_HA_PROXY_PROVIDER, + AutoRefreshNoHARMFailoverProxyProvider.class, + RMFailoverProxyProvider.class); + MiniYARNCluster cluster = + new MiniYARNCluster("testRestartedRMNegative", numNodeManagers, 1, 1); + YarnClient rmClient = null; + try { + cluster.init(conf); + cluster.start(); + final Configuration yarnConf = cluster.getConfig(); + rmClient = YarnClient.createYarnClient(); + rmClient.init(yarnConf); + rmClient.start(); + List <NodeReport> nodeReports = rmClient.getNodeReports(); + assertEquals( + "The proxy didn't get expected number of node reports", + numNodeManagers, nodeReports.size()); + } finally { + if (rmClient != null) { + rmClient.stop(); + } + cluster.stop(); + } + } + + /** + * Test that the {@link DefaultNoHARMFailoverProxyProvider} + * will generate different proxies after RM IP changed + * and {@link DefaultNoHARMFailoverProxyProvider#performFailover(Object)} + * get called. + */ + @Test + public void testDefaultFPPGetOneProxy() throws Exception { + class MockProxy extends Proxy implements Closeable { + protected MockProxy(InvocationHandler h) { + super(h); + } + + @Override + public void close() throws IOException { + } + } + + // Create a proxy and mock a RMProxy + Proxy mockProxy1 = new MockProxy((proxy, method, args) -> null); + Class protocol = ApplicationClientProtocol.class; + RMProxy mockRMProxy = mock(RMProxy.class); + DefaultNoHARMFailoverProxyProvider <RMProxy> fpp = + new DefaultNoHARMFailoverProxyProvider<RMProxy>(); + + // Default port of yarn RM + int port1 = 8032; Review comment: Do you want to make this as field or at least final? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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