| /** |
| * 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; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.RandomAccessFile; |
| import java.net.InetSocketAddress; |
| import java.util.Iterator; |
| import java.util.Random; |
| import java.util.concurrent.TimeoutException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.BlockLocation; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.protocol.ClientProtocol; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
| import org.apache.hadoop.hdfs.protocol.ExtendedBlock; |
| import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlock; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlocks; |
| import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset; |
| import org.apache.hadoop.util.Time; |
| import org.junit.Test; |
| |
| /** |
| * This class tests the replication of a DFS file. |
| */ |
| public class TestReplication { |
| private static final long seed = 0xDEADBEEFL; |
| private static final int blockSize = 8192; |
| private static final int fileSize = 16384; |
| private static final String racks[] = new String[] { |
| "/d1/r1", "/d1/r1", "/d1/r2", "/d1/r2", "/d1/r2", "/d2/r3", "/d2/r3" |
| }; |
| private static final int numDatanodes = racks.length; |
| private static final Log LOG = LogFactory.getLog( |
| "org.apache.hadoop.hdfs.TestReplication"); |
| |
| private void writeFile(FileSystem fileSys, Path name, int repl) |
| throws IOException { |
| // create and write a file that contains three blocks of data |
| FSDataOutputStream stm = fileSys.create(name, true, fileSys.getConf() |
| .getInt(CommonConfigurationKeys.IO_FILE_BUFFER_SIZE_KEY, 4096), |
| (short) repl, blockSize); |
| byte[] buffer = new byte[fileSize]; |
| Random rand = new Random(seed); |
| rand.nextBytes(buffer); |
| stm.write(buffer); |
| stm.close(); |
| } |
| |
| /* check if there are at least two nodes are on the same rack */ |
| private void checkFile(FileSystem fileSys, Path name, int repl) |
| throws IOException { |
| Configuration conf = fileSys.getConf(); |
| ClientProtocol namenode = NameNodeProxies.createProxy(conf, fileSys.getUri(), |
| ClientProtocol.class).getProxy(); |
| |
| waitForBlockReplication(name.toString(), namenode, |
| Math.min(numDatanodes, repl), -1); |
| |
| LocatedBlocks locations = namenode.getBlockLocations(name.toString(),0, |
| Long.MAX_VALUE); |
| FileStatus stat = fileSys.getFileStatus(name); |
| BlockLocation[] blockLocations = fileSys.getFileBlockLocations(stat,0L, |
| Long.MAX_VALUE); |
| // verify that rack locations match |
| assertTrue(blockLocations.length == locations.locatedBlockCount()); |
| for (int i = 0; i < blockLocations.length; i++) { |
| LocatedBlock blk = locations.get(i); |
| DatanodeInfo[] datanodes = blk.getLocations(); |
| String[] topologyPaths = blockLocations[i].getTopologyPaths(); |
| assertTrue(topologyPaths.length == datanodes.length); |
| for (int j = 0; j < topologyPaths.length; j++) { |
| boolean found = false; |
| for (int k = 0; k < racks.length; k++) { |
| if (topologyPaths[j].startsWith(racks[k])) { |
| found = true; |
| break; |
| } |
| } |
| assertTrue(found); |
| } |
| } |
| |
| boolean isOnSameRack = true, isNotOnSameRack = true; |
| for (LocatedBlock blk : locations.getLocatedBlocks()) { |
| DatanodeInfo[] datanodes = blk.getLocations(); |
| if (datanodes.length <= 1) break; |
| if (datanodes.length == 2) { |
| isNotOnSameRack = !(datanodes[0].getNetworkLocation().equals( |
| datanodes[1].getNetworkLocation())); |
| break; |
| } |
| isOnSameRack = false; |
| isNotOnSameRack = false; |
| for (int i = 0; i < datanodes.length-1; i++) { |
| LOG.info("datanode "+ i + ": "+ datanodes[i]); |
| boolean onRack = false; |
| for( int j=i+1; j<datanodes.length; j++) { |
| if( datanodes[i].getNetworkLocation().equals( |
| datanodes[j].getNetworkLocation()) ) { |
| onRack = true; |
| } |
| } |
| if (onRack) { |
| isOnSameRack = true; |
| } |
| if (!onRack) { |
| isNotOnSameRack = true; |
| } |
| if (isOnSameRack && isNotOnSameRack) break; |
| } |
| if (!isOnSameRack || !isNotOnSameRack) break; |
| } |
| assertTrue(isOnSameRack); |
| assertTrue(isNotOnSameRack); |
| } |
| |
| private void cleanupFile(FileSystem fileSys, Path name) throws IOException { |
| assertTrue(fileSys.exists(name)); |
| fileSys.delete(name, true); |
| assertTrue(!fileSys.exists(name)); |
| } |
| |
| /* |
| * Test if Datanode reports bad blocks during replication request |
| */ |
| @Test |
| public void testBadBlockReportOnTransfer() throws Exception { |
| Configuration conf = new HdfsConfiguration(); |
| FileSystem fs = null; |
| DFSClient dfsClient = null; |
| LocatedBlocks blocks = null; |
| int replicaCount = 0; |
| short replFactor = 1; |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build(); |
| cluster.waitActive(); |
| fs = cluster.getFileSystem(); |
| dfsClient = new DFSClient(new InetSocketAddress("localhost", |
| cluster.getNameNodePort()), conf); |
| |
| // Create file with replication factor of 1 |
| Path file1 = new Path("/tmp/testBadBlockReportOnTransfer/file1"); |
| DFSTestUtil.createFile(fs, file1, 1024, replFactor, 0); |
| DFSTestUtil.waitReplication(fs, file1, replFactor); |
| |
| // Corrupt the block belonging to the created file |
| ExtendedBlock block = DFSTestUtil.getFirstBlock(fs, file1); |
| |
| int blockFilesCorrupted = cluster.corruptBlockOnDataNodes(block); |
| assertEquals("Corrupted too few blocks", replFactor, blockFilesCorrupted); |
| |
| // Increase replication factor, this should invoke transfer request |
| // Receiving datanode fails on checksum and reports it to namenode |
| replFactor = 2; |
| fs.setReplication(file1, replFactor); |
| |
| // Now get block details and check if the block is corrupt |
| blocks = dfsClient.getNamenode(). |
| getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
| while (blocks.get(0).isCorrupt() != true) { |
| try { |
| LOG.info("Waiting until block is marked as corrupt..."); |
| Thread.sleep(1000); |
| } catch (InterruptedException ie) { |
| } |
| blocks = dfsClient.getNamenode(). |
| getBlockLocations(file1.toString(), 0, Long.MAX_VALUE); |
| } |
| replicaCount = blocks.get(0).getLocations().length; |
| assertTrue(replicaCount == 1); |
| cluster.shutdown(); |
| } |
| |
| /** |
| * Tests replication in DFS. |
| */ |
| public void runReplication(boolean simulated) throws IOException { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_REPLICATION_CONSIDERLOAD_KEY, false); |
| if (simulated) { |
| SimulatedFSDataset.setFactory(conf); |
| } |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf) |
| .numDataNodes(numDatanodes) |
| .racks(racks).build(); |
| cluster.waitActive(); |
| |
| InetSocketAddress addr = new InetSocketAddress("localhost", |
| cluster.getNameNodePort()); |
| DFSClient client = new DFSClient(addr, conf); |
| |
| DatanodeInfo[] info = client.datanodeReport(DatanodeReportType.LIVE); |
| assertEquals("Number of Datanodes ", numDatanodes, info.length); |
| FileSystem fileSys = cluster.getFileSystem(); |
| try { |
| Path file1 = new Path("/smallblocktest.dat"); |
| writeFile(fileSys, file1, 3); |
| checkFile(fileSys, file1, 3); |
| cleanupFile(fileSys, file1); |
| writeFile(fileSys, file1, 10); |
| checkFile(fileSys, file1, 10); |
| cleanupFile(fileSys, file1); |
| writeFile(fileSys, file1, 4); |
| checkFile(fileSys, file1, 4); |
| cleanupFile(fileSys, file1); |
| writeFile(fileSys, file1, 1); |
| checkFile(fileSys, file1, 1); |
| cleanupFile(fileSys, file1); |
| writeFile(fileSys, file1, 2); |
| checkFile(fileSys, file1, 2); |
| cleanupFile(fileSys, file1); |
| } finally { |
| fileSys.close(); |
| cluster.shutdown(); |
| } |
| } |
| |
| |
| @Test |
| public void testReplicationSimulatedStorag() throws IOException { |
| runReplication(true); |
| } |
| |
| |
| @Test |
| public void testReplication() throws IOException { |
| runReplication(false); |
| } |
| |
| // Waits for all of the blocks to have expected replication |
| private void waitForBlockReplication(String filename, |
| ClientProtocol namenode, |
| int expected, long maxWaitSec) |
| throws IOException { |
| long start = Time.now(); |
| |
| //wait for all the blocks to be replicated; |
| LOG.info("Checking for block replication for " + filename); |
| while (true) { |
| boolean replOk = true; |
| LocatedBlocks blocks = namenode.getBlockLocations(filename, 0, |
| Long.MAX_VALUE); |
| |
| for (Iterator<LocatedBlock> iter = blocks.getLocatedBlocks().iterator(); |
| iter.hasNext();) { |
| LocatedBlock block = iter.next(); |
| int actual = block.getLocations().length; |
| if ( actual < expected ) { |
| LOG.info("Not enough replicas for " + block.getBlock() |
| + " yet. Expecting " + expected + ", got " + actual + "."); |
| replOk = false; |
| break; |
| } |
| } |
| |
| if (replOk) { |
| return; |
| } |
| |
| if (maxWaitSec > 0 && |
| (Time.now() - start) > (maxWaitSec * 1000)) { |
| throw new IOException("Timedout while waiting for all blocks to " + |
| " be replicated for " + filename); |
| } |
| |
| try { |
| Thread.sleep(500); |
| } catch (InterruptedException ignored) {} |
| } |
| } |
| |
| /* This test makes sure that NameNode retries all the available blocks |
| * for under replicated blocks. |
| * |
| * It creates a file with one block and replication of 4. It corrupts |
| * two of the blocks and removes one of the replicas. Expected behavior is |
| * that missing replica will be copied from one valid source. |
| */ |
| @Test |
| public void testPendingReplicationRetry() throws IOException { |
| |
| MiniDFSCluster cluster = null; |
| int numDataNodes = 4; |
| String testFile = "/replication-test-file"; |
| Path testPath = new Path(testFile); |
| |
| byte buffer[] = new byte[1024]; |
| for (int i=0; i<buffer.length; i++) { |
| buffer[i] = '1'; |
| } |
| |
| try { |
| Configuration conf = new HdfsConfiguration(); |
| conf.set(DFSConfigKeys.DFS_REPLICATION_KEY, Integer.toString(numDataNodes)); |
| //first time format |
| cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDataNodes).build(); |
| cluster.waitActive(); |
| DFSClient dfsClient = new DFSClient(new InetSocketAddress("localhost", |
| cluster.getNameNodePort()), |
| conf); |
| |
| OutputStream out = cluster.getFileSystem().create(testPath); |
| out.write(buffer); |
| out.close(); |
| |
| waitForBlockReplication(testFile, dfsClient.getNamenode(), numDataNodes, -1); |
| |
| // get first block of the file. |
| ExtendedBlock block = dfsClient.getNamenode().getBlockLocations(testFile, |
| 0, Long.MAX_VALUE).get(0).getBlock(); |
| |
| cluster.shutdown(); |
| cluster = null; |
| |
| for (int i=0; i<25; i++) { |
| buffer[i] = '0'; |
| } |
| |
| int fileCount = 0; |
| // Choose 3 copies of block file - delete 1 and corrupt the remaining 2 |
| for (int dnIndex=0; dnIndex<3; dnIndex++) { |
| File blockFile = MiniDFSCluster.getBlockFile(dnIndex, block); |
| LOG.info("Checking for file " + blockFile); |
| |
| if (blockFile != null && blockFile.exists()) { |
| if (fileCount == 0) { |
| LOG.info("Deleting file " + blockFile); |
| assertTrue(blockFile.delete()); |
| } else { |
| // corrupt it. |
| LOG.info("Corrupting file " + blockFile); |
| long len = blockFile.length(); |
| assertTrue(len > 50); |
| RandomAccessFile blockOut = new RandomAccessFile(blockFile, "rw"); |
| try { |
| blockOut.seek(len/3); |
| blockOut.write(buffer, 0, 25); |
| } finally { |
| blockOut.close(); |
| } |
| } |
| fileCount++; |
| } |
| } |
| assertEquals(3, fileCount); |
| |
| /* Start the MiniDFSCluster with more datanodes since once a writeBlock |
| * to a datanode node fails, same block can not be written to it |
| * immediately. In our case some replication attempts will fail. |
| */ |
| |
| LOG.info("Restarting minicluster after deleting a replica and corrupting 2 crcs"); |
| conf = new HdfsConfiguration(); |
| conf.set(DFSConfigKeys.DFS_REPLICATION_KEY, Integer.toString(numDataNodes)); |
| conf.set(DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_KEY, Integer.toString(2)); |
| conf.set("dfs.datanode.block.write.timeout.sec", Integer.toString(5)); |
| conf.set(DFSConfigKeys.DFS_NAMENODE_SAFEMODE_THRESHOLD_PCT_KEY, "0.75f"); // only 3 copies exist |
| |
| cluster = new MiniDFSCluster.Builder(conf) |
| .numDataNodes(numDataNodes * 2) |
| .format(false) |
| .build(); |
| cluster.waitActive(); |
| |
| dfsClient = new DFSClient(new InetSocketAddress("localhost", |
| cluster.getNameNodePort()), |
| conf); |
| |
| waitForBlockReplication(testFile, dfsClient.getNamenode(), numDataNodes, -1); |
| |
| } finally { |
| if (cluster != null) { |
| cluster.shutdown(); |
| } |
| } |
| } |
| |
| /** |
| * Test if replication can detect mismatched length on-disk blocks |
| * @throws Exception |
| */ |
| @Test |
| public void testReplicateLenMismatchedBlock() throws Exception { |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(new HdfsConfiguration()).numDataNodes(2).build(); |
| try { |
| cluster.waitActive(); |
| // test truncated block |
| changeBlockLen(cluster, -1); |
| // test extended block |
| changeBlockLen(cluster, 1); |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| private void changeBlockLen(MiniDFSCluster cluster, int lenDelta) |
| throws IOException, InterruptedException, TimeoutException { |
| final Path fileName = new Path("/file1"); |
| final short REPLICATION_FACTOR = (short)1; |
| final FileSystem fs = cluster.getFileSystem(); |
| final int fileLen = fs.getConf().getInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, 512); |
| DFSTestUtil.createFile(fs, fileName, fileLen, REPLICATION_FACTOR, 0); |
| DFSTestUtil.waitReplication(fs, fileName, REPLICATION_FACTOR); |
| |
| ExtendedBlock block = DFSTestUtil.getFirstBlock(fs, fileName); |
| |
| // Change the length of a replica |
| for (int i=0; i<cluster.getDataNodes().size(); i++) { |
| if (TestDatanodeBlockScanner.changeReplicaLength(block, i, lenDelta)) { |
| break; |
| } |
| } |
| |
| // increase the file's replication factor |
| fs.setReplication(fileName, (short)(REPLICATION_FACTOR+1)); |
| |
| // block replication triggers corrupt block detection |
| DFSClient dfsClient = new DFSClient(new InetSocketAddress("localhost", |
| cluster.getNameNodePort()), fs.getConf()); |
| LocatedBlocks blocks = dfsClient.getNamenode().getBlockLocations( |
| fileName.toString(), 0, fileLen); |
| if (lenDelta < 0) { // replica truncated |
| while (!blocks.get(0).isCorrupt() || |
| REPLICATION_FACTOR != blocks.get(0).getLocations().length) { |
| Thread.sleep(100); |
| blocks = dfsClient.getNamenode().getBlockLocations( |
| fileName.toString(), 0, fileLen); |
| } |
| } else { // no corruption detected; block replicated |
| while (REPLICATION_FACTOR+1 != blocks.get(0).getLocations().length) { |
| Thread.sleep(100); |
| blocks = dfsClient.getNamenode().getBlockLocations( |
| fileName.toString(), 0, fileLen); |
| } |
| } |
| fs.delete(fileName, true); |
| } |
| } |