[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |
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| 19 | package org.apache.hadoop.hdfs; |
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| 20 | |
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| 21 | import java.io.IOException; |
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| 22 | import java.net.InetSocketAddress; |
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| 23 | import java.net.URL; |
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| 24 | import java.util.regex.Matcher; |
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| 25 | import java.util.regex.Pattern; |
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| 26 | import java.io.*; |
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| 27 | import java.nio.channels.FileChannel; |
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| 28 | import java.util.Random; |
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| 29 | |
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| 30 | import org.apache.commons.logging.Log; |
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| 31 | import org.apache.commons.logging.LogFactory; |
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| 32 | import org.apache.hadoop.conf.Configuration; |
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| 33 | import org.apache.hadoop.hdfs.protocol.Block; |
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| 34 | import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
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| 35 | import org.apache.hadoop.hdfs.protocol.LocatedBlocks; |
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| 36 | import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType; |
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| 37 | import org.apache.hadoop.fs.FileSystem; |
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| 38 | import org.apache.hadoop.fs.Path; |
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| 39 | import org.apache.hadoop.io.IOUtils; |
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| 40 | |
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| 41 | import junit.framework.TestCase; |
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| 42 | |
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| 43 | /** |
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| 44 | * This test verifies that block verification occurs on the datanode |
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| 45 | */ |
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| 46 | public class TestDatanodeBlockScanner extends TestCase { |
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| 47 | |
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| 48 | private static final Log LOG = |
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| 49 | LogFactory.getLog(TestDatanodeBlockScanner.class); |
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| 50 | |
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| 51 | private static Pattern pattern = |
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| 52 | Pattern.compile(".*?(blk_[-]*\\d+).*?scan time\\s*:\\s*(\\d+)"); |
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| 53 | /** |
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| 54 | * This connects to datanode and fetches block verification data. |
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| 55 | * It repeats this until the given block has a verification time > 0. |
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| 56 | */ |
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| 57 | private static long waitForVerification(DatanodeInfo dn, FileSystem fs, |
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| 58 | Path file) throws IOException { |
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| 59 | URL url = new URL("http://localhost:" + dn.getInfoPort() + |
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| 60 | "/blockScannerReport?listblocks"); |
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| 61 | long lastWarnTime = System.currentTimeMillis(); |
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| 62 | long verificationTime = 0; |
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| 63 | |
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| 64 | String block = DFSTestUtil.getFirstBlock(fs, file).getBlockName(); |
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| 65 | |
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| 66 | while (verificationTime <= 0) { |
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| 67 | String response = DFSTestUtil.urlGet(url); |
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| 68 | for(Matcher matcher = pattern.matcher(response); matcher.find();) { |
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| 69 | if (block.equals(matcher.group(1))) { |
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| 70 | verificationTime = Long.parseLong(matcher.group(2)); |
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| 71 | break; |
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| 72 | } |
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| 73 | } |
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| 74 | |
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| 75 | if (verificationTime <= 0) { |
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| 76 | long now = System.currentTimeMillis(); |
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| 77 | if ((now - lastWarnTime) >= 5*1000) { |
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| 78 | LOG.info("Waiting for verification of " + block); |
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| 79 | lastWarnTime = now; |
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| 80 | } |
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| 81 | try { |
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| 82 | Thread.sleep(500); |
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| 83 | } catch (InterruptedException ignored) {} |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | return verificationTime; |
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| 88 | } |
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| 89 | |
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| 90 | public void testDatanodeBlockScanner() throws IOException { |
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| 91 | |
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| 92 | long startTime = System.currentTimeMillis(); |
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| 93 | |
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| 94 | Configuration conf = new Configuration(); |
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| 95 | MiniDFSCluster cluster = new MiniDFSCluster(conf, 1, true, null); |
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| 96 | cluster.waitActive(); |
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| 97 | |
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| 98 | FileSystem fs = cluster.getFileSystem(); |
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| 99 | Path file1 = new Path("/tmp/testBlockVerification/file1"); |
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| 100 | Path file2 = new Path("/tmp/testBlockVerification/file2"); |
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| 101 | |
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| 102 | /* |
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| 103 | * Write the first file and restart the cluster. |
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| 104 | */ |
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| 105 | DFSTestUtil.createFile(fs, file1, 10, (short)1, 0); |
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| 106 | cluster.shutdown(); |
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| 107 | cluster = new MiniDFSCluster(conf, 1, false, null); |
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| 108 | cluster.waitActive(); |
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| 109 | |
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| 110 | DFSClient dfsClient = new DFSClient(new InetSocketAddress("localhost", |
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| 111 | cluster.getNameNodePort()), conf); |
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| 112 | fs = cluster.getFileSystem(); |
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| 113 | DatanodeInfo dn = dfsClient.datanodeReport(DatanodeReportType.LIVE)[0]; |
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| 114 | |
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| 115 | /* |
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| 116 | * The cluster restarted. The block should be verified by now. |
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| 117 | */ |
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| 118 | assertTrue(waitForVerification(dn, fs, file1) > startTime); |
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| 119 | |
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| 120 | /* |
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| 121 | * Create a new file and read the block. The block should be marked |
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| 122 | * verified since the client reads the block and verifies checksum. |
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| 123 | */ |
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| 124 | DFSTestUtil.createFile(fs, file2, 10, (short)1, 0); |
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| 125 | IOUtils.copyBytes(fs.open(file2), new IOUtils.NullOutputStream(), |
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| 126 | conf, true); |
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| 127 | assertTrue(waitForVerification(dn, fs, file2) > startTime); |
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| 128 | |
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| 129 | cluster.shutdown(); |
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| 130 | } |
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| 131 | |
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| 132 | public static boolean corruptReplica(String blockName, int replica) throws IOException { |
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| 133 | Random random = new Random(); |
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| 134 | File baseDir = new File(System.getProperty("test.build.data"), "dfs/data"); |
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| 135 | boolean corrupted = false; |
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| 136 | for (int i=replica*2; i<replica*2+2; i++) { |
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| 137 | File blockFile = new File(baseDir, "data" + (i+1)+ "/current/" + |
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| 138 | blockName); |
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| 139 | if (blockFile.exists()) { |
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| 140 | // Corrupt replica by writing random bytes into replica |
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| 141 | RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw"); |
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| 142 | FileChannel channel = raFile.getChannel(); |
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| 143 | String badString = "BADBAD"; |
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| 144 | int rand = random.nextInt((int)channel.size()/2); |
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| 145 | raFile.seek(rand); |
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| 146 | raFile.write(badString.getBytes()); |
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| 147 | raFile.close(); |
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| 148 | corrupted = true; |
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| 149 | } |
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| 150 | } |
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| 151 | return corrupted; |
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| 152 | } |
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| 153 | |
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| 154 | public void testBlockCorruptionPolicy() throws IOException { |
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| 155 | Configuration conf = new Configuration(); |
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| 156 | conf.setLong("dfs.blockreport.intervalMsec", 1000L); |
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| 157 | Random random = new Random(); |
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| 158 | FileSystem fs = null; |
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| 159 | DFSClient dfsClient = null; |
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| 160 | LocatedBlocks blocks = null; |
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| 161 | int blockCount = 0; |
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| 162 | int rand = random.nextInt(3); |
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| 163 | |
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| 164 | MiniDFSCluster cluster = new MiniDFSCluster(conf, 3, true, null); |
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| 165 | cluster.waitActive(); |
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| 166 | fs = cluster.getFileSystem(); |
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| 167 | Path file1 = new Path("/tmp/testBlockVerification/file1"); |
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| 168 | DFSTestUtil.createFile(fs, file1, 1024, (short)3, 0); |
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| 169 | String block = DFSTestUtil.getFirstBlock(fs, file1).getBlockName(); |
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| 170 | |
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| 171 | dfsClient = new DFSClient(new InetSocketAddress("localhost", |
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| 172 | cluster.getNameNodePort()), conf); |
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| 173 | do { |
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| 174 | blocks = dfsClient.namenode. |
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| 175 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 176 | blockCount = blocks.get(0).getLocations().length; |
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| 177 | try { |
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| 178 | LOG.info("Looping until expected blockCount of 3 is received"); |
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| 179 | Thread.sleep(1000); |
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| 180 | } catch (InterruptedException ignore) { |
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| 181 | } |
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| 182 | } while (blockCount != 3); |
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| 183 | assertTrue(blocks.get(0).isCorrupt() == false); |
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| 184 | |
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| 185 | // Corrupt random replica of block |
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| 186 | corruptReplica(block, rand); |
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| 187 | |
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| 188 | // Restart the datanode hoping the corrupt block to be reported |
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| 189 | cluster.restartDataNode(rand); |
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| 190 | |
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| 191 | // We have 2 good replicas and block is not corrupt |
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| 192 | do { |
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| 193 | blocks = dfsClient.namenode. |
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| 194 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 195 | blockCount = blocks.get(0).getLocations().length; |
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| 196 | try { |
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| 197 | LOG.info("Looping until expected blockCount of 2 is received"); |
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| 198 | Thread.sleep(1000); |
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| 199 | } catch (InterruptedException ignore) { |
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| 200 | } |
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| 201 | } while (blockCount != 2); |
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| 202 | assertTrue(blocks.get(0).isCorrupt() == false); |
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| 203 | |
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| 204 | // Corrupt all replicas. Now, block should be marked as corrupt |
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| 205 | // and we should get all the replicas |
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| 206 | corruptReplica(block, 0); |
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| 207 | corruptReplica(block, 1); |
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| 208 | corruptReplica(block, 2); |
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| 209 | |
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| 210 | // Read the file to trigger reportBadBlocks by client |
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| 211 | try { |
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| 212 | IOUtils.copyBytes(fs.open(file1), new IOUtils.NullOutputStream(), |
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| 213 | conf, true); |
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| 214 | } catch (IOException e) { |
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| 215 | // Ignore exception |
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| 216 | } |
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| 217 | |
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| 218 | // We now have the blocks to be marked as corrupt and we get back all |
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| 219 | // its replicas |
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| 220 | do { |
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| 221 | blocks = dfsClient.namenode. |
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| 222 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 223 | blockCount = blocks.get(0).getLocations().length; |
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| 224 | try { |
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| 225 | LOG.info("Looping until expected blockCount of 3 is received"); |
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| 226 | Thread.sleep(1000); |
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| 227 | } catch (InterruptedException ignore) { |
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| 228 | } |
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| 229 | } while (blockCount != 3); |
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| 230 | assertTrue(blocks.get(0).isCorrupt() == true); |
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| 231 | |
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| 232 | cluster.shutdown(); |
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| 233 | } |
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| 234 | |
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| 235 | /** |
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| 236 | * testBlockCorruptionRecoveryPolicy. |
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| 237 | * This tests recovery of corrupt replicas, first for one corrupt replica |
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| 238 | * then for two. The test invokes blockCorruptionRecoveryPolicy which |
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| 239 | * 1. Creates a block with desired number of replicas |
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| 240 | * 2. Corrupts the desired number of replicas and restarts the datanodes |
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| 241 | * containing the corrupt replica. Additionaly we also read the block |
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| 242 | * in case restarting does not report corrupt replicas. |
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| 243 | * Restarting or reading from the datanode would trigger reportBadBlocks |
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| 244 | * to namenode. |
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| 245 | * NameNode adds it to corruptReplicasMap and neededReplication |
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| 246 | * 3. Test waits until all corrupt replicas are reported, meanwhile |
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| 247 | * Re-replciation brings the block back to healthy state |
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| 248 | * 4. Test again waits until the block is reported with expected number |
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| 249 | * of good replicas. |
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| 250 | */ |
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| 251 | public void testBlockCorruptionRecoveryPolicy() throws IOException { |
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| 252 | // Test recovery of 1 corrupt replica |
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| 253 | LOG.info("Testing corrupt replica recovery for one corrupt replica"); |
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| 254 | blockCorruptionRecoveryPolicy(4, (short)3, 1); |
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| 255 | |
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| 256 | // Test recovery of 2 corrupt replicas |
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| 257 | LOG.info("Testing corrupt replica recovery for two corrupt replicas"); |
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| 258 | blockCorruptionRecoveryPolicy(5, (short)3, 2); |
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| 259 | } |
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| 260 | |
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| 261 | private void blockCorruptionRecoveryPolicy(int numDataNodes, |
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| 262 | short numReplicas, |
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| 263 | int numCorruptReplicas) |
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| 264 | throws IOException { |
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| 265 | Configuration conf = new Configuration(); |
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| 266 | conf.setLong("dfs.blockreport.intervalMsec", 30L); |
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| 267 | conf.setLong("dfs.replication.interval", 30); |
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| 268 | conf.setLong("dfs.heartbeat.interval", 30L); |
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| 269 | conf.setBoolean("dfs.replication.considerLoad", false); |
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| 270 | Random random = new Random(); |
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| 271 | FileSystem fs = null; |
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| 272 | DFSClient dfsClient = null; |
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| 273 | LocatedBlocks blocks = null; |
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| 274 | int replicaCount = 0; |
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| 275 | int rand = random.nextInt(numDataNodes); |
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| 276 | |
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| 277 | MiniDFSCluster cluster = new MiniDFSCluster(conf, numDataNodes, true, null); |
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| 278 | cluster.waitActive(); |
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| 279 | fs = cluster.getFileSystem(); |
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| 280 | Path file1 = new Path("/tmp/testBlockCorruptRecovery/file"); |
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| 281 | DFSTestUtil.createFile(fs, file1, 1024, numReplicas, 0); |
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| 282 | Block blk = DFSTestUtil.getFirstBlock(fs, file1); |
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| 283 | String block = blk.getBlockName(); |
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| 284 | |
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| 285 | dfsClient = new DFSClient(new InetSocketAddress("localhost", |
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| 286 | cluster.getNameNodePort()), conf); |
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| 287 | blocks = dfsClient.namenode. |
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| 288 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 289 | replicaCount = blocks.get(0).getLocations().length; |
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| 290 | |
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| 291 | // Wait until block is replicated to numReplicas |
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| 292 | while (replicaCount != numReplicas) { |
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| 293 | try { |
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| 294 | LOG.info("Looping until expected replicaCount of " + numReplicas + |
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| 295 | "is reached"); |
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| 296 | Thread.sleep(1000); |
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| 297 | } catch (InterruptedException ignore) { |
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| 298 | } |
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| 299 | blocks = dfsClient.namenode. |
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| 300 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 301 | replicaCount = blocks.get(0).getLocations().length; |
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| 302 | } |
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| 303 | assertTrue(blocks.get(0).isCorrupt() == false); |
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| 304 | |
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| 305 | // Corrupt numCorruptReplicas replicas of block |
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| 306 | int[] corruptReplicasDNIDs = new int[numCorruptReplicas]; |
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| 307 | for (int i=0, j=0; (j != numCorruptReplicas) && (i < numDataNodes); i++) { |
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| 308 | if (corruptReplica(block, i)) |
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| 309 | corruptReplicasDNIDs[j++] = i; |
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| 310 | } |
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| 311 | |
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| 312 | // Restart the datanodes containing corrupt replicas |
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| 313 | // so they would be reported to namenode and re-replicated |
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| 314 | for (int i =0; i < numCorruptReplicas; i++) |
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| 315 | cluster.restartDataNode(corruptReplicasDNIDs[i]); |
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| 316 | |
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| 317 | // Loop until all corrupt replicas are reported |
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| 318 | int corruptReplicaSize = cluster.getNameNode().namesystem. |
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| 319 | corruptReplicas.numCorruptReplicas(blk); |
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| 320 | while (corruptReplicaSize != numCorruptReplicas) { |
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| 321 | try { |
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| 322 | IOUtils.copyBytes(fs.open(file1), new IOUtils.NullOutputStream(), |
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| 323 | conf, true); |
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| 324 | } catch (IOException e) { |
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| 325 | } |
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| 326 | try { |
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| 327 | LOG.info("Looping until expected " + numCorruptReplicas + " are " + |
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| 328 | "reported. Current reported " + corruptReplicaSize); |
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| 329 | Thread.sleep(1000); |
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| 330 | } catch (InterruptedException ignore) { |
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| 331 | } |
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| 332 | corruptReplicaSize = cluster.getNameNode().namesystem. |
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| 333 | corruptReplicas.numCorruptReplicas(blk); |
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| 334 | } |
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| 335 | |
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| 336 | // Loop until the block recovers after replication |
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| 337 | blocks = dfsClient.namenode. |
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| 338 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 339 | replicaCount = blocks.get(0).getLocations().length; |
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| 340 | while (replicaCount != numReplicas) { |
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| 341 | try { |
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| 342 | LOG.info("Looping until block gets rereplicated to " + numReplicas); |
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| 343 | Thread.sleep(1000); |
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| 344 | } catch (InterruptedException ignore) { |
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| 345 | } |
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| 346 | blocks = dfsClient.namenode. |
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| 347 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 348 | replicaCount = blocks.get(0).getLocations().length; |
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| 349 | } |
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| 350 | |
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| 351 | // Make sure the corrupt replica is invalidated and removed from |
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| 352 | // corruptReplicasMap |
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| 353 | corruptReplicaSize = cluster.getNameNode().namesystem. |
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| 354 | corruptReplicas.numCorruptReplicas(blk); |
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| 355 | while (corruptReplicaSize != 0 || replicaCount != numReplicas) { |
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| 356 | try { |
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| 357 | LOG.info("Looping until corrupt replica is invalidated"); |
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| 358 | Thread.sleep(1000); |
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| 359 | } catch (InterruptedException ignore) { |
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| 360 | } |
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| 361 | corruptReplicaSize = cluster.getNameNode().namesystem. |
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| 362 | corruptReplicas.numCorruptReplicas(blk); |
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| 363 | blocks = dfsClient.namenode. |
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| 364 | getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
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| 365 | replicaCount = blocks.get(0).getLocations().length; |
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| 366 | } |
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| 367 | // Make sure block is healthy |
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| 368 | assertTrue(corruptReplicaSize == 0); |
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| 369 | assertTrue(replicaCount == numReplicas); |
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| 370 | assertTrue(blocks.get(0).isCorrupt() == false); |
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| 371 | cluster.shutdown(); |
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| 372 | } |
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| 373 | |
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| 374 | /** Test if NameNode handles truncated blocks in block report */ |
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| 375 | public void testTruncatedBlockReport() throws Exception { |
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| 376 | final Configuration conf = new Configuration(); |
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| 377 | final short REPLICATION_FACTOR = (short)2; |
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| 378 | |
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| 379 | MiniDFSCluster cluster = new MiniDFSCluster(conf, REPLICATION_FACTOR, true, null); |
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| 380 | cluster.waitActive(); |
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| 381 | FileSystem fs = cluster.getFileSystem(); |
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| 382 | try { |
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| 383 | final Path fileName = new Path("/file1"); |
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| 384 | DFSTestUtil.createFile(fs, fileName, 1, REPLICATION_FACTOR, 0); |
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| 385 | DFSTestUtil.waitReplication(fs, fileName, REPLICATION_FACTOR); |
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| 386 | |
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| 387 | String block = DFSTestUtil.getFirstBlock(fs, fileName).getBlockName(); |
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| 388 | |
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| 389 | // Truncate replica of block |
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| 390 | changeReplicaLength(block, 0, -1); |
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| 391 | |
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| 392 | cluster.shutdown(); |
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| 393 | |
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| 394 | // restart the cluster |
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| 395 | cluster = new MiniDFSCluster( |
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| 396 | 0, conf, REPLICATION_FACTOR, false, true, null, null, null); |
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| 397 | cluster.startDataNodes(conf, 1, true, null, null); |
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| 398 | cluster.waitActive(); // now we have 3 datanodes |
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| 399 | |
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| 400 | // wait for truncated block be detected and the block to be replicated |
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| 401 | DFSTestUtil.waitReplication( |
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| 402 | cluster.getFileSystem(), fileName, REPLICATION_FACTOR); |
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| 403 | |
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| 404 | // Make sure that truncated block will be deleted |
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| 405 | waitForBlockDeleted(block, 0); |
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| 406 | } finally { |
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| 407 | cluster.shutdown(); |
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| 408 | } |
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| 409 | } |
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| 410 | |
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| 411 | /** |
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| 412 | * Change the length of a block at datanode dnIndex |
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| 413 | */ |
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| 414 | static boolean changeReplicaLength(String blockName, int dnIndex, int lenDelta) throws IOException { |
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| 415 | File baseDir = new File(System.getProperty("test.build.data"), "dfs/data"); |
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| 416 | for (int i=dnIndex*2; i<dnIndex*2+2; i++) { |
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| 417 | File blockFile = new File(baseDir, "data" + (i+1)+ "/current/" + |
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| 418 | blockName); |
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| 419 | if (blockFile.exists()) { |
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| 420 | RandomAccessFile raFile = new RandomAccessFile(blockFile, "rw"); |
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| 421 | raFile.setLength(raFile.length()+lenDelta); |
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| 422 | raFile.close(); |
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| 423 | return true; |
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| 424 | } |
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| 425 | } |
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| 426 | return false; |
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| 427 | } |
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| 428 | |
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| 429 | private static void waitForBlockDeleted(String blockName, int dnIndex) |
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| 430 | throws IOException, InterruptedException { |
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| 431 | File baseDir = new File(System.getProperty("test.build.data"), "dfs/data"); |
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| 432 | File blockFile1 = new File(baseDir, "data" + (2*dnIndex+1)+ "/current/" + |
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| 433 | blockName); |
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| 434 | File blockFile2 = new File(baseDir, "data" + (2*dnIndex+2)+ "/current/" + |
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| 435 | blockName); |
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| 436 | while (blockFile1.exists() || blockFile2.exists()) { |
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| 437 | Thread.sleep(100); |
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| 438 | } |
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| 439 | } |
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| 440 | } |
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