| /** |
| * 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 org.junit.Test; |
| import org.junit.AfterClass; |
| import org.junit.BeforeClass; |
| import java.io.BufferedReader; |
| import java.io.FileInputStream; |
| import java.io.DataInputStream; |
| import java.io.InputStreamReader; |
| import java.io.IOException; |
| import java.lang.InterruptedException; |
| import java.util.Random; |
| import static org.junit.Assert.assertTrue; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| |
| /** |
| * This class tests the creation and validation of metasave |
| */ |
| public class TestMetaSave { |
| static final int NUM_DATA_NODES = 2; |
| static final long seed = 0xDEADBEEFL; |
| static final int blockSize = 8192; |
| private static MiniDFSCluster cluster = null; |
| private static FileSystem fileSys = null; |
| |
| private void createFile(FileSystem fileSys, Path name) throws IOException { |
| FSDataOutputStream stm = fileSys.create(name, true, fileSys.getConf() |
| .getInt(CommonConfigurationKeys.IO_FILE_BUFFER_SIZE_KEY, 4096), |
| (short) 2, blockSize); |
| byte[] buffer = new byte[1024]; |
| Random rand = new Random(seed); |
| rand.nextBytes(buffer); |
| stm.write(buffer); |
| stm.close(); |
| } |
| |
| @BeforeClass |
| public static void setUp() throws IOException { |
| // start a cluster |
| Configuration conf = new HdfsConfiguration(); |
| |
| // High value of replication interval |
| // so that blocks remain under-replicated |
| conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, 1000); |
| conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1L); |
| conf.setLong(DFSConfigKeys.DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY, 1L); |
| cluster = new MiniDFSCluster.Builder(conf).numDataNodes(NUM_DATA_NODES).build(); |
| cluster.waitActive(); |
| fileSys = cluster.getFileSystem(); |
| } |
| |
| /** |
| * Tests metasave |
| */ |
| @Test |
| public void testMetaSave() throws IOException, InterruptedException { |
| |
| final FSNamesystem namesystem = cluster.getNamesystem(); |
| |
| for (int i = 0; i < 2; i++) { |
| Path file = new Path("/filestatus" + i); |
| createFile(fileSys, file); |
| } |
| |
| cluster.stopDataNode(1); |
| // wait for namenode to discover that a datanode is dead |
| Thread.sleep(15000); |
| namesystem.setReplication("/filestatus0", (short) 4); |
| |
| namesystem.metaSave("metasave.out.txt"); |
| |
| // Verification |
| String logFile = System.getProperty("hadoop.log.dir") + "/" |
| + "metasave.out.txt"; |
| FileInputStream fstream = new FileInputStream(logFile); |
| DataInputStream in = new DataInputStream(fstream); |
| BufferedReader reader = new BufferedReader(new InputStreamReader(in)); |
| String line = reader.readLine(); |
| assertTrue(line.equals("3 files and directories, 2 blocks = 5 total")); |
| line = reader.readLine(); |
| assertTrue(line.equals("Live Datanodes: 1")); |
| line = reader.readLine(); |
| assertTrue(line.equals("Dead Datanodes: 1")); |
| line = reader.readLine(); |
| line = reader.readLine(); |
| assertTrue(line.matches("^/filestatus[01]:.*")); |
| } |
| |
| @AfterClass |
| public static void tearDown() throws IOException { |
| if (fileSys != null) |
| fileSys.close(); |
| if (cluster != null) |
| cluster.shutdown(); |
| } |
| } |