/**
* 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 static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Random;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
/**
* 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 static FSNamesystem namesystem = 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();
namesystem = cluster.getNamesystem();
}
/**
* Tests metasave
*/
@Test
public void testMetaSave() throws IOException, InterruptedException {
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
FileInputStream fstream = new FileInputStream(getLogFile(
"metasave.out.txt"));
DataInputStream in = new DataInputStream(fstream);
BufferedReader reader = null;
try {
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]:.*"));
} finally {
if (reader != null)
reader.close();
}
}
/**
* Tests metasave after delete, to make sure there are no orphaned blocks
*/
@Test
public void testMetasaveAfterDelete()
throws IOException, InterruptedException {
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.delete("/filestatus0", true);
namesystem.delete("/filestatus1", true);
namesystem.metaSave("metasaveAfterDelete.out.txt");
// Verification
BufferedReader reader = null;
try {
FileInputStream fstream = new FileInputStream(getLogFile(
"metasaveAfterDelete.out.txt"));
DataInputStream in = new DataInputStream(fstream);
reader = new BufferedReader(new InputStreamReader(in));
reader.readLine();
String line = reader.readLine();
assertTrue(line.equals("Live Datanodes: 1"));
line = reader.readLine();
assertTrue(line.equals("Dead Datanodes: 1"));
line = reader.readLine();
assertTrue(line.equals("Metasave: Blocks waiting for replication: 0"));
line = reader.readLine();
assertTrue(line.equals("Mis-replicated blocks that have been postponed:"));
line = reader.readLine();
assertTrue(line.equals("Metasave: Blocks being replicated: 0"));
} finally {
if (reader != null)
reader.close();
}
}
/**
* Tests that metasave overwrites the output file (not append).
*/
@Test
public void testMetaSaveOverwrite() throws Exception {
// metaSave twice.
namesystem.metaSave("metaSaveOverwrite.out.txt");
namesystem.metaSave("metaSaveOverwrite.out.txt");
// Read output file.
FileInputStream fis = null;
InputStreamReader isr = null;
BufferedReader rdr = null;
try {
fis = new FileInputStream(getLogFile("metaSaveOverwrite.out.txt"));
isr = new InputStreamReader(fis);
rdr = new BufferedReader(isr);
// Validate that file was overwritten (not appended) by checking for
// presence of only one "Live Datanodes" line.
boolean foundLiveDatanodesLine = false;
String line = rdr.readLine();
while (line != null) {
if (line.startsWith("Live Datanodes")) {
if (foundLiveDatanodesLine) {
fail("multiple Live Datanodes lines, output file not overwritten");
}
foundLiveDatanodesLine = true;
}
line = rdr.readLine();
}
} finally {
IOUtils.cleanup(null, rdr, isr, fis);
}
}
@AfterClass
public static void tearDown() throws IOException {
if (fileSys != null)
fileSys.close();
if (cluster != null)
cluster.shutdown();
}
/**
* Returns a File for the given name inside the log directory.
*
* @param name String file name
* @return File for given name inside log directory
*/
private static File getLogFile(String name) {
return new File(System.getProperty("hadoop.log.dir"), name);
}
}