| /** |
| * 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.net; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Test the static mapping class. |
| * Because the map is actually static, this map needs to be reset for every test |
| */ |
| public class TestStaticMapping extends Assert { |
| private static final Log LOG = LogFactory.getLog(TestStaticMapping.class); |
| |
| /** |
| * Reset the map then create a new instance of the {@link StaticMapping} |
| * class with a null configuration |
| * @return a new instance |
| */ |
| private StaticMapping newInstance() { |
| StaticMapping.resetMap(); |
| return new StaticMapping(); |
| } |
| |
| |
| /** |
| * Reset the map then create a new instance of the {@link StaticMapping} |
| * class with the topology script in the configuration set to |
| * the parameter |
| * @param script a (never executed) script, can be null |
| * @return a new instance |
| */ |
| private StaticMapping newInstance(String script) { |
| StaticMapping mapping = newInstance(); |
| mapping.setConf(createConf(script)); |
| return mapping; |
| } |
| |
| /** |
| * Create a configuration with a specific topology script |
| * @param script a (never executed) script, can be null |
| * @return a configuration |
| */ |
| private Configuration createConf(String script) { |
| Configuration conf = new Configuration(); |
| if (script != null) { |
| conf.set(CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY, |
| script); |
| } else { |
| conf.unset(CommonConfigurationKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY); |
| } |
| return conf; |
| } |
| |
| private void assertSingleSwitch(DNSToSwitchMapping mapping) { |
| assertEquals("Expected a single switch mapping " |
| + mapping, |
| true, |
| AbstractDNSToSwitchMapping.isMappingSingleSwitch(mapping)); |
| } |
| |
| private void assertMultiSwitch(DNSToSwitchMapping mapping) { |
| assertEquals("Expected a multi switch mapping " |
| + mapping, |
| false, |
| AbstractDNSToSwitchMapping.isMappingSingleSwitch(mapping)); |
| } |
| |
| protected void assertMapSize(AbstractDNSToSwitchMapping switchMapping, int expectedSize) { |
| assertEquals( |
| "Expected two entries in the map " + switchMapping.dumpTopology(), |
| expectedSize, switchMapping.getSwitchMap().size()); |
| } |
| |
| private List<String> createQueryList() { |
| List<String> l1 = new ArrayList<String>(2); |
| l1.add("n1"); |
| l1.add("unknown"); |
| return l1; |
| } |
| |
| @Test |
| public void testStaticIsSingleSwitchOnNullScript() throws Throwable { |
| StaticMapping mapping = newInstance(null); |
| mapping.setConf(createConf(null)); |
| assertSingleSwitch(mapping); |
| } |
| |
| @Test |
| public void testStaticIsMultiSwitchOnScript() throws Throwable { |
| StaticMapping mapping = newInstance("ls"); |
| assertMultiSwitch(mapping); |
| } |
| |
| @Test |
| public void testAddResolveNodes() throws Throwable { |
| StaticMapping mapping = newInstance(); |
| StaticMapping.addNodeToRack("n1", "/r1"); |
| List<String> queryList = createQueryList(); |
| List<String> resolved = mapping.resolve(queryList); |
| assertEquals(2, resolved.size()); |
| assertEquals("/r1", resolved.get(0)); |
| assertEquals(NetworkTopology.DEFAULT_RACK, resolved.get(1)); |
| // get the switch map and examine it |
| Map<String, String> switchMap = mapping.getSwitchMap(); |
| String topology = mapping.dumpTopology(); |
| LOG.info(topology); |
| assertEquals(topology, 1, switchMap.size()); |
| assertEquals(topology, "/r1", switchMap.get("n1")); |
| } |
| |
| /** |
| * Verify that a configuration string builds a topology |
| */ |
| @Test |
| public void testReadNodesFromConfig() throws Throwable { |
| StaticMapping mapping = newInstance(); |
| Configuration conf = new Configuration(); |
| conf.set(StaticMapping.KEY_HADOOP_CONFIGURED_NODE_MAPPING, "n1=/r1,n2=/r2"); |
| mapping.setConf(conf); |
| //even though we have inserted elements into the list, because |
| //it is driven by the script key in the configuration, it still |
| //thinks that it is single rack |
| assertSingleSwitch(mapping); |
| List<String> l1 = new ArrayList<String>(3); |
| l1.add("n1"); |
| l1.add("unknown"); |
| l1.add("n2"); |
| List<String> resolved = mapping.resolve(l1); |
| assertEquals(3, resolved.size()); |
| assertEquals("/r1", resolved.get(0)); |
| assertEquals(NetworkTopology.DEFAULT_RACK, resolved.get(1)); |
| assertEquals("/r2", resolved.get(2)); |
| |
| Map<String, String> switchMap = mapping.getSwitchMap(); |
| String topology = mapping.dumpTopology(); |
| LOG.info(topology); |
| assertEquals(topology, 2, switchMap.size()); |
| assertEquals(topology, "/r1", switchMap.get("n1")); |
| assertNull(topology, switchMap.get("unknown")); |
| } |
| |
| |
| /** |
| * Verify that if the inner mapping is single-switch, so is the cached one |
| * @throws Throwable on any problem |
| */ |
| @Test |
| public void testCachingRelaysSingleSwitchQueries() throws Throwable { |
| //create a single switch map |
| StaticMapping staticMapping = newInstance(null); |
| assertSingleSwitch(staticMapping); |
| CachedDNSToSwitchMapping cachedMap = |
| new CachedDNSToSwitchMapping(staticMapping); |
| LOG.info("Mapping: " + cachedMap + "\n" + cachedMap.dumpTopology()); |
| assertSingleSwitch(cachedMap); |
| } |
| |
| /** |
| * Verify that if the inner mapping is multi-switch, so is the cached one |
| * @throws Throwable on any problem |
| */ |
| @Test |
| public void testCachingRelaysMultiSwitchQueries() throws Throwable { |
| StaticMapping staticMapping = newInstance("top"); |
| assertMultiSwitch(staticMapping); |
| CachedDNSToSwitchMapping cachedMap = |
| new CachedDNSToSwitchMapping(staticMapping); |
| LOG.info("Mapping: " + cachedMap + "\n" + cachedMap.dumpTopology()); |
| assertMultiSwitch(cachedMap); |
| } |
| |
| |
| /** |
| * This test verifies that resultion queries get relayed to the inner rack |
| * @throws Throwable on any problem |
| */ |
| @Test |
| public void testCachingRelaysResolveQueries() throws Throwable { |
| StaticMapping mapping = newInstance(); |
| mapping.setConf(createConf("top")); |
| StaticMapping staticMapping = mapping; |
| CachedDNSToSwitchMapping cachedMap = |
| new CachedDNSToSwitchMapping(staticMapping); |
| assertMapSize(cachedMap, 0); |
| //add a node to the static map |
| StaticMapping.addNodeToRack("n1", "/r1"); |
| //verify it is there |
| assertMapSize(staticMapping, 1); |
| //verify that the cache hasn't picked it up yet |
| assertMapSize(cachedMap, 0); |
| //now relay the query |
| cachedMap.resolve(createQueryList()); |
| //and verify the cache is no longer empty |
| assertMapSize(cachedMap, 2); |
| } |
| |
| /** |
| * This test verifies that resultion queries get relayed to the inner rack |
| * @throws Throwable on any problem |
| */ |
| @Test |
| public void testCachingCachesNegativeEntries() throws Throwable { |
| StaticMapping staticMapping = newInstance(); |
| CachedDNSToSwitchMapping cachedMap = |
| new CachedDNSToSwitchMapping(staticMapping); |
| assertMapSize(cachedMap, 0); |
| assertMapSize(staticMapping, 0); |
| List<String> resolved = cachedMap.resolve(createQueryList()); |
| //and verify the cache is no longer empty while the static map is |
| assertMapSize(staticMapping, 0); |
| assertMapSize(cachedMap, 2); |
| } |
| |
| |
| } |