/**
* 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.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.fs.FSDataOutputStream;
/**
* 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("io.file.buffer.size", 4096), (short) 2, (long) 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 Configuration();
// High value of replication interval
// so that blocks remain under-replicated
conf.setInt("dfs.replication.interval", 1000);
conf.setLong("dfs.heartbeat.interval", 1L);
conf.setLong("heartbeat.recheck.interval", 1L);
cluster = new MiniDFSCluster(conf, NUM_DATA_NODES, true, null);
cluster.waitActive();
fileSys = cluster.getFileSystem();
}
/**
* Tests metasave
*/
@Test
public void testMetaSave() throws IOException, InterruptedException {
final FSNamesystem namesystem = cluster.getNameNode().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();
}
}