| /** |
| * 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.datanode; |
| |
| import static org.apache.hadoop.test.MetricsAsserts.assertCounter; |
| import static org.apache.hadoop.test.MetricsAsserts.getMetrics; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assume.assumeTrue; |
| |
| import java.io.File; |
| import java.util.ArrayList; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.commons.logging.impl.Log4JLogger; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.FileUtil; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.DFSTestUtil; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor; |
| import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager; |
| import org.apache.log4j.Level; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| /** |
| * Test reporting of DN volume failure counts and metrics. |
| */ |
| public class TestDataNodeVolumeFailureReporting { |
| |
| private static final Log LOG = LogFactory.getLog(TestDataNodeVolumeFailureReporting.class); |
| { |
| ((Log4JLogger)TestDataNodeVolumeFailureReporting.LOG).getLogger().setLevel(Level.ALL); |
| } |
| |
| private FileSystem fs; |
| private MiniDFSCluster cluster; |
| private Configuration conf; |
| private String dataDir; |
| |
| // Sleep at least 3 seconds (a 1s heartbeat plus padding) to allow |
| // for heartbeats to propagate from the datanodes to the namenode. |
| final int WAIT_FOR_HEARTBEATS = 3000; |
| |
| // Wait at least (2 * re-check + 10 * heartbeat) seconds for |
| // a datanode to be considered dead by the namenode. |
| final int WAIT_FOR_DEATH = 15000; |
| |
| @Before |
| public void setUp() throws Exception { |
| conf = new HdfsConfiguration(); |
| conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 512L); |
| /* |
| * Lower the DN heartbeat, DF rate, and recheck interval to one second |
| * so state about failures and datanode death propagates faster. |
| */ |
| conf.setInt(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1); |
| conf.setInt(DFSConfigKeys.DFS_DF_INTERVAL_KEY, 1000); |
| conf.setInt(DFSConfigKeys.DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY, 1000); |
| // Allow a single volume failure (there are two volumes) |
| conf.setInt(DFSConfigKeys.DFS_DATANODE_FAILED_VOLUMES_TOLERATED_KEY, 1); |
| cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build(); |
| cluster.waitActive(); |
| fs = cluster.getFileSystem(); |
| dataDir = cluster.getDataDirectory(); |
| } |
| |
| @After |
| public void tearDown() throws Exception { |
| for (int i = 0; i < 3; i++) { |
| FileUtil.setExecutable(new File(dataDir, "data"+(2*i+1)), true); |
| FileUtil.setExecutable(new File(dataDir, "data"+(2*i+2)), true); |
| } |
| cluster.shutdown(); |
| } |
| |
| /** |
| * Test that individual volume failures do not cause DNs to fail, that |
| * all volumes failed on a single datanode do cause it to fail, and |
| * that the capacities and liveliness is adjusted correctly in the NN. |
| */ |
| @Test |
| public void testSuccessiveVolumeFailures() throws Exception { |
| assumeTrue(!System.getProperty("os.name").startsWith("Windows")); |
| |
| // Bring up two more datanodes |
| cluster.startDataNodes(conf, 2, true, null, null); |
| cluster.waitActive(); |
| |
| /* |
| * Calculate the total capacity of all the datanodes. Sleep for |
| * three seconds to be sure the datanodes have had a chance to |
| * heartbeat their capacities. |
| */ |
| Thread.sleep(WAIT_FOR_HEARTBEATS); |
| final DatanodeManager dm = cluster.getNamesystem().getBlockManager( |
| ).getDatanodeManager(); |
| |
| final long origCapacity = DFSTestUtil.getLiveDatanodeCapacity(dm); |
| long dnCapacity = DFSTestUtil.getDatanodeCapacity(dm, 0); |
| |
| File dn1Vol1 = new File(dataDir, "data"+(2*0+1)); |
| File dn2Vol1 = new File(dataDir, "data"+(2*1+1)); |
| File dn3Vol1 = new File(dataDir, "data"+(2*2+1)); |
| File dn3Vol2 = new File(dataDir, "data"+(2*2+2)); |
| |
| /* |
| * Make the 1st volume directories on the first two datanodes |
| * non-accessible. We don't make all three 1st volume directories |
| * readonly since that would cause the entire pipeline to |
| * fail. The client does not retry failed nodes even though |
| * perhaps they could succeed because just a single volume failed. |
| */ |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, false)); |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, false)); |
| |
| /* |
| * Create file1 and wait for 3 replicas (ie all DNs can still |
| * store a block). Then assert that all DNs are up, despite the |
| * volume failures. |
| */ |
| Path file1 = new Path("/test1"); |
| DFSTestUtil.createFile(fs, file1, 1024, (short)3, 1L); |
| DFSTestUtil.waitReplication(fs, file1, (short)3); |
| ArrayList<DataNode> dns = cluster.getDataNodes(); |
| assertTrue("DN1 should be up", dns.get(0).isDatanodeUp()); |
| assertTrue("DN2 should be up", dns.get(1).isDatanodeUp()); |
| assertTrue("DN3 should be up", dns.get(2).isDatanodeUp()); |
| |
| /* |
| * The metrics should confirm the volume failures. |
| */ |
| assertCounter("VolumeFailures", 1L, |
| getMetrics(dns.get(0).getMetrics().name())); |
| assertCounter("VolumeFailures", 1L, |
| getMetrics(dns.get(1).getMetrics().name())); |
| assertCounter("VolumeFailures", 0L, |
| getMetrics(dns.get(2).getMetrics().name())); |
| |
| // Ensure we wait a sufficient amount of time |
| assert (WAIT_FOR_HEARTBEATS * 10) > WAIT_FOR_DEATH; |
| |
| // Eventually the NN should report two volume failures |
| DFSTestUtil.waitForDatanodeStatus(dm, 3, 0, 2, |
| origCapacity - (1*dnCapacity), WAIT_FOR_HEARTBEATS); |
| |
| /* |
| * Now fail a volume on the third datanode. We should be able to get |
| * three replicas since we've already identified the other failures. |
| */ |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol1, false)); |
| Path file2 = new Path("/test2"); |
| DFSTestUtil.createFile(fs, file2, 1024, (short)3, 1L); |
| DFSTestUtil.waitReplication(fs, file2, (short)3); |
| assertTrue("DN3 should still be up", dns.get(2).isDatanodeUp()); |
| assertCounter("VolumeFailures", 1L, |
| getMetrics(dns.get(2).getMetrics().name())); |
| |
| ArrayList<DatanodeDescriptor> live = new ArrayList<DatanodeDescriptor>(); |
| ArrayList<DatanodeDescriptor> dead = new ArrayList<DatanodeDescriptor>(); |
| dm.fetchDatanodes(live, dead, false); |
| live.clear(); |
| dead.clear(); |
| dm.fetchDatanodes(live, dead, false); |
| assertEquals("DN3 should have 1 failed volume", |
| 1, live.get(2).getVolumeFailures()); |
| |
| /* |
| * Once the datanodes have a chance to heartbeat their new capacity the |
| * total capacity should be down by three volumes (assuming the host |
| * did not grow or shrink the data volume while the test was running). |
| */ |
| dnCapacity = DFSTestUtil.getDatanodeCapacity(dm, 0); |
| DFSTestUtil.waitForDatanodeStatus(dm, 3, 0, 3, |
| origCapacity - (3*dnCapacity), WAIT_FOR_HEARTBEATS); |
| |
| /* |
| * Now fail the 2nd volume on the 3rd datanode. All its volumes |
| * are now failed and so it should report two volume failures |
| * and that it's no longer up. Only wait for two replicas since |
| * we'll never get a third. |
| */ |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol2, false)); |
| Path file3 = new Path("/test3"); |
| DFSTestUtil.createFile(fs, file3, 1024, (short)3, 1L); |
| DFSTestUtil.waitReplication(fs, file3, (short)2); |
| |
| // The DN should consider itself dead |
| DFSTestUtil.waitForDatanodeDeath(dns.get(2)); |
| |
| // And report two failed volumes |
| assertCounter("VolumeFailures", 2L, |
| getMetrics(dns.get(2).getMetrics().name())); |
| |
| // The NN considers the DN dead |
| DFSTestUtil.waitForDatanodeStatus(dm, 2, 1, 2, |
| origCapacity - (4*dnCapacity), WAIT_FOR_HEARTBEATS); |
| |
| /* |
| * The datanode never tries to restore the failed volume, even if |
| * it's subsequently repaired, but it should see this volume on |
| * restart, so file creation should be able to succeed after |
| * restoring the data directories and restarting the datanodes. |
| */ |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, true)); |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, true)); |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol1, true)); |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn3Vol2, true)); |
| cluster.restartDataNodes(); |
| cluster.waitActive(); |
| Path file4 = new Path("/test4"); |
| DFSTestUtil.createFile(fs, file4, 1024, (short)3, 1L); |
| DFSTestUtil.waitReplication(fs, file4, (short)3); |
| |
| /* |
| * Eventually the capacity should be restored to its original value, |
| * and that the volume failure count should be reported as zero by |
| * both the metrics and the NN. |
| */ |
| DFSTestUtil.waitForDatanodeStatus(dm, 3, 0, 0, origCapacity, |
| WAIT_FOR_HEARTBEATS); |
| } |
| |
| /** |
| * Test that the NN re-learns of volume failures after restart. |
| */ |
| @Test |
| public void testVolFailureStatsPreservedOnNNRestart() throws Exception { |
| assumeTrue(!System.getProperty("os.name").startsWith("Windows")); |
| |
| // Bring up two more datanodes that can tolerate 1 failure |
| cluster.startDataNodes(conf, 2, true, null, null); |
| cluster.waitActive(); |
| |
| final DatanodeManager dm = cluster.getNamesystem().getBlockManager( |
| ).getDatanodeManager(); |
| long origCapacity = DFSTestUtil.getLiveDatanodeCapacity(dm); |
| long dnCapacity = DFSTestUtil.getDatanodeCapacity(dm, 0); |
| |
| // Fail the first volume on both datanodes (we have to keep the |
| // third healthy so one node in the pipeline will not fail). |
| File dn1Vol1 = new File(dataDir, "data"+(2*0+1)); |
| File dn2Vol1 = new File(dataDir, "data"+(2*1+1)); |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn1Vol1, false)); |
| assertTrue("Couldn't chmod local vol", FileUtil.setExecutable(dn2Vol1, false)); |
| |
| Path file1 = new Path("/test1"); |
| DFSTestUtil.createFile(fs, file1, 1024, (short)2, 1L); |
| DFSTestUtil.waitReplication(fs, file1, (short)2); |
| |
| // The NN reports two volumes failures |
| DFSTestUtil.waitForDatanodeStatus(dm, 3, 0, 2, |
| origCapacity - (1*dnCapacity), WAIT_FOR_HEARTBEATS); |
| |
| // After restarting the NN it still see the two failures |
| cluster.restartNameNode(0); |
| cluster.waitActive(); |
| DFSTestUtil.waitForDatanodeStatus(dm, 3, 0, 2, |
| origCapacity - (1*dnCapacity), WAIT_FOR_HEARTBEATS); |
| } |
| } |