| /** |
| * 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 java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Random; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| 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.protocol.Block; |
| import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState; |
| import org.apache.hadoop.hdfs.server.datanode.FSDataset.FSVolume; |
| import org.apache.hadoop.hdfs.server.datanode.FSDatasetInterface.FSVolumeInterface; |
| import org.apache.hadoop.io.IOUtils; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** Test if a datanode can correctly upgrade itself */ |
| public class TestDatanodeRestart { |
| // test finalized replicas persist across DataNode restarts |
| @Test public void testFinalizedReplicas() throws Exception { |
| // bring up a cluster of 3 |
| Configuration conf = new HdfsConfiguration(); |
| conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1024L); |
| conf.setInt(DFSConfigKeys.DFS_CLIENT_WRITE_PACKET_SIZE_KEY, 512); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build(); |
| cluster.waitActive(); |
| FileSystem fs = cluster.getFileSystem(); |
| try { |
| // test finalized replicas |
| final String TopDir = "/test"; |
| DFSTestUtil util = new DFSTestUtil("TestCrcCorruption", 2, 3, 8*1024); |
| util.createFiles(fs, TopDir, (short)3); |
| util.waitReplication(fs, TopDir, (short)3); |
| util.checkFiles(fs, TopDir); |
| cluster.restartDataNodes(); |
| cluster.waitActive(); |
| util.checkFiles(fs, TopDir); |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| // test rbw replicas persist across DataNode restarts |
| public void testRbwReplicas() throws IOException { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1024L); |
| conf.setInt(DFSConfigKeys.DFS_CLIENT_WRITE_PACKET_SIZE_KEY, 512); |
| conf.setBoolean("dfs.support.append", true); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build(); |
| cluster.waitActive(); |
| try { |
| testRbwReplicas(cluster, false); |
| testRbwReplicas(cluster, true); |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| private void testRbwReplicas(MiniDFSCluster cluster, boolean isCorrupt) |
| throws IOException { |
| FSDataOutputStream out = null; |
| FileSystem fs = cluster.getFileSystem(); |
| final Path src = new Path("/test.txt"); |
| try { |
| final int fileLen = 515; |
| // create some rbw replicas on disk |
| byte[] writeBuf = new byte[fileLen]; |
| new Random().nextBytes(writeBuf); |
| out = fs.create(src); |
| out.write(writeBuf); |
| out.hflush(); |
| DataNode dn = cluster.getDataNodes().get(0); |
| for (FSVolumeInterface v : dn.data.getVolumes()) { |
| FSVolume volume = (FSVolume)v; |
| File currentDir = volume.getCurrentDir().getParentFile().getParentFile(); |
| File rbwDir = new File(currentDir, "rbw"); |
| for (File file : rbwDir.listFiles()) { |
| if (isCorrupt && Block.isBlockFilename(file)) { |
| new RandomAccessFile(file, "rw").setLength(fileLen-1); // corrupt |
| } |
| } |
| } |
| cluster.restartDataNodes(); |
| cluster.waitActive(); |
| dn = cluster.getDataNodes().get(0); |
| |
| // check volumeMap: one rwr replica |
| String bpid = cluster.getNamesystem().getBlockPoolId(); |
| ReplicasMap replicas = ((FSDataset)(dn.data)).volumeMap; |
| Assert.assertEquals(1, replicas.size(bpid)); |
| ReplicaInfo replica = replicas.replicas(bpid).iterator().next(); |
| Assert.assertEquals(ReplicaState.RWR, replica.getState()); |
| if (isCorrupt) { |
| Assert.assertEquals((fileLen-1)/512*512, replica.getNumBytes()); |
| } else { |
| Assert.assertEquals(fileLen, replica.getNumBytes()); |
| } |
| dn.data.invalidate(bpid, new Block[]{replica}); |
| } finally { |
| IOUtils.closeStream(out); |
| if (fs.exists(src)) { |
| fs.delete(src, false); |
| } |
| fs.close(); |
| } |
| } |
| |
| // test recovering unlinked tmp replicas |
| @Test public void testRecoverReplicas() throws IOException { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1024L); |
| conf.setInt(DFSConfigKeys.DFS_CLIENT_WRITE_PACKET_SIZE_KEY, 512); |
| conf.setBoolean("dfs.support.append", true); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build(); |
| cluster.waitActive(); |
| try { |
| FileSystem fs = cluster.getFileSystem(); |
| for (int i=0; i<4; i++) { |
| Path fileName = new Path("/test"+i); |
| DFSTestUtil.createFile(fs, fileName, 1, (short)1, 0L); |
| DFSTestUtil.waitReplication(fs, fileName, (short)1); |
| } |
| String bpid = cluster.getNamesystem().getBlockPoolId(); |
| DataNode dn = cluster.getDataNodes().get(0); |
| Iterator<ReplicaInfo> replicasItor = |
| ((FSDataset)dn.data).volumeMap.replicas(bpid).iterator(); |
| ReplicaInfo replica = replicasItor.next(); |
| createUnlinkTmpFile(replica, true, true); // rename block file |
| createUnlinkTmpFile(replica, false, true); // rename meta file |
| replica = replicasItor.next(); |
| createUnlinkTmpFile(replica, true, false); // copy block file |
| createUnlinkTmpFile(replica, false, false); // copy meta file |
| replica = replicasItor.next(); |
| createUnlinkTmpFile(replica, true, true); // rename block file |
| createUnlinkTmpFile(replica, false, false); // copy meta file |
| |
| cluster.restartDataNodes(); |
| cluster.waitActive(); |
| dn = cluster.getDataNodes().get(0); |
| |
| // check volumeMap: 4 finalized replica |
| Collection<ReplicaInfo> replicas = |
| ((FSDataset)(dn.data)).volumeMap.replicas(bpid); |
| Assert.assertEquals(4, replicas.size()); |
| replicasItor = replicas.iterator(); |
| while (replicasItor.hasNext()) { |
| Assert.assertEquals(ReplicaState.FINALIZED, |
| replicasItor.next().getState()); |
| } |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| private static void createUnlinkTmpFile(ReplicaInfo replicaInfo, |
| boolean changeBlockFile, |
| boolean isRename) throws IOException { |
| File src; |
| if (changeBlockFile) { |
| src = replicaInfo.getBlockFile(); |
| } else { |
| src = replicaInfo.getMetaFile(); |
| } |
| File dst = DatanodeUtil.getUnlinkTmpFile(src); |
| if (isRename) { |
| src.renameTo(dst); |
| } else { |
| FileInputStream in = new FileInputStream(src); |
| try { |
| FileOutputStream out = new FileOutputStream(dst); |
| try { |
| IOUtils.copyBytes(in, out, 1); |
| } finally { |
| out.close(); |
| } |
| } finally { |
| in.close(); |
| } |
| } |
| } |
| } |