| /** |
| * 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.hdfs.server.blockmanagement; |
| |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.TestBlockStoragePolicy; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
| import org.apache.hadoop.net.NetworkTopology; |
| import org.apache.hadoop.test.GenericTestUtils.DelayAnswer; |
| import org.junit.Test; |
| |
| import java.util.ArrayList; |
| import java.util.Set; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| |
| import static org.apache.hadoop.fs.contract.hdfs.HDFSContract.BLOCK_SIZE; |
| import static org.mockito.Mockito.doAnswer; |
| import static org.mockito.Mockito.spy; |
| |
| /** |
| * This class tests RedundancyMonitor in BlockManager. |
| */ |
| public class TestRedundancyMonitor { |
| private static final String FILENAME = "/dummyfile.txt"; |
| |
| /** |
| * RedundancyMonitor invoke choose target out of global lock when |
| * #computeDatanodeWork. However it may result in NN terminate when choose |
| * target meet runtime exception(ArithmeticException) since we stop all |
| * DataNodes during that time. |
| * Verify that NN should not terminate even stop all datanodes. |
| */ |
| @Test |
| public void testChooseTargetWhenAllDataNodesStop() throws Throwable { |
| |
| HdfsConfiguration conf = new HdfsConfiguration(); |
| String[] hosts = new String[]{"host1", "host2"}; |
| String[] racks = new String[]{"/d1/r1", "/d1/r1"}; |
| try (MiniDFSCluster miniCluster = new MiniDFSCluster.Builder(conf) |
| .racks(racks).hosts(hosts).numDataNodes(hosts.length).build()) { |
| miniCluster.waitActive(); |
| |
| FSNamesystem fsn = miniCluster.getNamesystem(); |
| BlockManager blockManager = fsn.getBlockManager(); |
| |
| BlockPlacementPolicyDefault replicator |
| = (BlockPlacementPolicyDefault) blockManager |
| .getBlockPlacementPolicy(); |
| Set<DatanodeDescriptor> dns = blockManager.getDatanodeManager() |
| .getDatanodes(); |
| |
| DelayAnswer delayer = new DelayAnswer(BlockPlacementPolicyDefault.LOG); |
| NetworkTopology clusterMap = replicator.clusterMap; |
| NetworkTopology spyClusterMap = spy(clusterMap); |
| replicator.clusterMap = spyClusterMap; |
| doAnswer(delayer).when(spyClusterMap).getNumOfRacks(); |
| |
| ExecutorService pool = Executors.newFixedThreadPool(2); |
| |
| // Trigger chooseTarget |
| Future<Void> chooseTargetFuture = pool.submit(() -> { |
| replicator.chooseTarget(FILENAME, 2, dns.iterator().next(), |
| new ArrayList<DatanodeStorageInfo>(), false, null, BLOCK_SIZE, |
| TestBlockStoragePolicy.DEFAULT_STORAGE_POLICY, null); |
| return null; |
| }); |
| |
| // Wait until chooseTarget calls NetworkTopology#getNumOfRacks |
| delayer.waitForCall(); |
| // Remove all DataNodes |
| Future<Void> stopDatanodesFuture = pool.submit(() -> { |
| for (DatanodeDescriptor dn : dns) { |
| spyClusterMap.remove(dn); |
| } |
| return null; |
| }); |
| // Wait stopDatanodesFuture run finish |
| stopDatanodesFuture.get(); |
| |
| // Allow chooseTarget to proceed |
| delayer.proceed(); |
| try { |
| chooseTargetFuture.get(); |
| } catch (ExecutionException ee) { |
| throw ee.getCause(); |
| } |
| } |
| } |
| } |