| /** |
| * 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.namenode; |
| |
| import junit.framework.TestCase; |
| import java.io.*; |
| import java.net.URI; |
| import java.util.Iterator; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.permission.*; |
| |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream; |
| import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory; |
| import org.apache.hadoop.hdfs.server.namenode.FSImage.NameNodeDirType; |
| import org.apache.hadoop.hdfs.server.namenode.FSImage.NameNodeFile; |
| |
| /** |
| * This class tests the creation and validation of a checkpoint. |
| */ |
| public class TestEditLog extends TestCase { |
| static final int NUM_DATA_NODES = 1; |
| |
| // This test creates NUM_THREADS threads and each thread does |
| // 2 * NUM_TRANSACTIONS Transactions concurrently. |
| static final int NUM_TRANSACTIONS = 100; |
| static final int NUM_THREADS = 100; |
| |
| // |
| // an object that does a bunch of transactions |
| // |
| static class Transactions implements Runnable { |
| FSNamesystem namesystem; |
| int numTransactions; |
| short replication = 3; |
| long blockSize = 64; |
| |
| Transactions(FSNamesystem ns, int num) { |
| namesystem = ns; |
| numTransactions = num; |
| } |
| |
| // add a bunch of transactions. |
| public void run() { |
| PermissionStatus p = namesystem.createFsOwnerPermissions( |
| new FsPermission((short)0777)); |
| FSEditLog editLog = namesystem.getEditLog(); |
| |
| for (int i = 0; i < numTransactions; i++) { |
| try { |
| INodeFileUnderConstruction inode = new INodeFileUnderConstruction( |
| p, replication, blockSize, 0, "", "", null); |
| editLog.logOpenFile("/filename" + i, inode); |
| editLog.logCloseFile("/filename" + i, inode); |
| editLog.logSync(); |
| } catch (IOException e) { |
| System.out.println("Transaction " + i + " encountered exception " + |
| e); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Tests transaction logging in dfs. |
| */ |
| public void testEditLog() throws IOException { |
| |
| // start a cluster |
| Configuration conf = new HdfsConfiguration(); |
| MiniDFSCluster cluster = null; |
| FileSystem fileSys = null; |
| |
| try { |
| cluster = new MiniDFSCluster(conf, NUM_DATA_NODES, true, null); |
| cluster.waitActive(); |
| fileSys = cluster.getFileSystem(); |
| final FSNamesystem namesystem = cluster.getNamesystem(); |
| |
| for (Iterator<URI> it = cluster.getNameDirs().iterator(); it.hasNext(); ) { |
| File dir = new File(it.next().getPath()); |
| System.out.println(dir); |
| } |
| |
| FSImage fsimage = namesystem.getFSImage(); |
| FSEditLog editLog = fsimage.getEditLog(); |
| |
| // set small size of flush buffer |
| editLog.setBufferCapacity(2048); |
| editLog.close(); |
| editLog.open(); |
| |
| // Create threads and make them run transactions concurrently. |
| Thread threadId[] = new Thread[NUM_THREADS]; |
| for (int i = 0; i < NUM_THREADS; i++) { |
| Transactions trans = new Transactions(namesystem, NUM_TRANSACTIONS); |
| threadId[i] = new Thread(trans, "TransactionThread-" + i); |
| threadId[i].start(); |
| } |
| |
| // wait for all transactions to get over |
| for (int i = 0; i < NUM_THREADS; i++) { |
| try { |
| threadId[i].join(); |
| } catch (InterruptedException e) { |
| i--; // retry |
| } |
| } |
| |
| editLog.close(); |
| editLog.open(); |
| |
| // Verify that we can read in all the transactions that we have written. |
| // If there were any corruptions, it is likely that the reading in |
| // of these transactions will throw an exception. |
| // |
| for (Iterator<StorageDirectory> it = |
| fsimage.dirIterator(NameNodeDirType.EDITS); it.hasNext();) { |
| File editFile = FSImage.getImageFile(it.next(), NameNodeFile.EDITS); |
| System.out.println("Verifying file: " + editFile); |
| int numEdits = namesystem.getEditLog().loadFSEdits( |
| new EditLogFileInputStream(editFile)); |
| int numLeases = namesystem.leaseManager.countLease(); |
| System.out.println("Number of outstanding leases " + numLeases); |
| assertEquals(0, numLeases); |
| assertTrue("Verification for " + editFile + " failed. " + |
| "Expected " + (NUM_THREADS * 2 * NUM_TRANSACTIONS) + " transactions. "+ |
| "Found " + numEdits + " transactions.", |
| numEdits == NUM_THREADS * 2 * NUM_TRANSACTIONS); |
| |
| } |
| } finally { |
| if(fileSys != null) fileSys.close(); |
| if(cluster != null) cluster.shutdown(); |
| } |
| } |
| } |