| /** |
| * 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.yarn.util; |
| |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeysPublic; |
| import org.apache.hadoop.net.DNSToSwitchMapping; |
| import org.apache.hadoop.net.Node; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| public class TestRackResolver { |
| |
| private static Log LOG = LogFactory.getLog(TestRackResolver.class); |
| |
| public static final class MyResolver implements DNSToSwitchMapping { |
| |
| int numHost1 = 0; |
| public static String resolvedHost1 = "host1"; |
| |
| @Override |
| public List<String> resolve(List<String> hostList) { |
| // Only one host at a time |
| Assert.assertTrue("hostList size is " + hostList.size(), |
| hostList.size() <= 1); |
| List<String> returnList = new ArrayList<String>(); |
| if (hostList.isEmpty()) { |
| return returnList; |
| } |
| LOG.info("Received resolve request for " |
| + hostList.get(0)); |
| if (hostList.get(0).equals("host1") |
| || hostList.get(0).equals(resolvedHost1)) { |
| numHost1++; |
| returnList.add("/rack1"); |
| } |
| // I should not be reached again as RackResolver is supposed to do |
| // caching. |
| Assert.assertTrue(numHost1 <= 1); |
| return returnList; |
| } |
| |
| } |
| |
| @Test |
| public void testCaching() { |
| Configuration conf = new Configuration(); |
| conf.setClass( |
| CommonConfigurationKeysPublic.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY, |
| MyResolver.class, DNSToSwitchMapping.class); |
| RackResolver.init(conf); |
| try { |
| InetAddress iaddr = InetAddress.getByName("host1"); |
| MyResolver.resolvedHost1 = iaddr.getHostAddress(); |
| } catch (UnknownHostException e) { |
| // Ignore if not found |
| } |
| Node node = RackResolver.resolve("host1"); |
| Assert.assertEquals("/rack1", node.getNetworkLocation()); |
| node = RackResolver.resolve("host1"); |
| Assert.assertEquals("/rack1", node.getNetworkLocation()); |
| } |
| |
| } |