/**
* 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.datanode;
import java.io.DataOutputStream;
import java.io.File;
import java.net.InetSocketAddress;
import java.net.Socket;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.DataTransferProtocol;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.DiskChecker;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
import org.junit.Test;
import org.junit.Before;
import org.junit.After;
import static org.junit.Assert.*;
/**
* Test that datanodes can correctly handle errors during block read/write.
*/
public class TestDiskError {
private FileSystem fs;
private MiniDFSCluster cluster;
private Configuration conf;
private String dataDir;
@Before
public void setUp() throws Exception {
conf = new Configuration();
conf.setLong("dfs.block.size", 512L);
cluster = new MiniDFSCluster(conf, 1, true, null);
cluster.waitActive();
fs = cluster.getFileSystem();
dataDir = cluster.getDataDirectory();
}
@After
public void tearDown() throws Exception {
cluster.shutdown();
}
/**
* Test to check that a DN goes down when all its volumes have failed.
*/
@Test
public void testShutdown() throws Exception {
if (System.getProperty("os.name").startsWith("Windows")) {
/**
* This test depends on OS not allowing file creations on a directory
* that does not have write permissions for the user. Apparently it is
* not the case on Windows (at least under Cygwin), and possibly AIX.
* This is disabled on Windows.
*/
return;
}
// Bring up two more datanodes
cluster.startDataNodes(conf, 2, true, null, null);
cluster.waitActive();
final int dnIndex = 0;
String dataDir = cluster.getDataDirectory();
File dir1 = new File(new File(dataDir, "data"+(2*dnIndex+1)), "blocksBeingWritten");
File dir2 = new File(new File(dataDir, "data"+(2*dnIndex+2)), "blocksBeingWritten");
try {
// make the data directory of the first datanode to be readonly
assertTrue("Couldn't chmod local vol", dir1.setReadOnly());
assertTrue("Couldn't chmod local vol", dir2.setReadOnly());
// create files and make sure that first datanode will be down
DataNode dn = cluster.getDataNodes().get(dnIndex);
for (int i=0; DataNode.isDatanodeUp(dn); i++) {
Path fileName = new Path("/test.txt"+i);
DFSTestUtil.createFile(fs, fileName, 1024, (short)2, 1L);
DFSTestUtil.waitReplication(fs, fileName, (short)2);
fs.delete(fileName, true);
}
} finally {
// restore its old permission
dir1.setWritable(true);
dir2.setWritable(true);
}
}
/**
* Test that when there is a failure replicating a block the temporary
* and meta files are cleaned up and subsequent replication succeeds.
*/
@Test
public void testReplicationError() throws Exception {
// Bring up two more datanodes
cluster.startDataNodes(conf, 2, true, null, null);
cluster.waitActive();
// create a file of replication factor of 1
final Path fileName = new Path("/test.txt");
final int fileLen = 1;
DFSTestUtil.createFile(fs, fileName, 1, (short)1, 1L);
DFSTestUtil.waitReplication(fs, fileName, (short)1);
// get the block belonged to the created file
LocatedBlocks blocks = cluster.getNameNode().namesystem.getBlockLocations(
fileName.toString(), 0, (long)fileLen);
assertEquals(blocks.locatedBlockCount(), 1);
LocatedBlock block = blocks.get(0);
// bring up a second datanode
cluster.startDataNodes(conf, 1, true, null, null);
cluster.waitActive();
final int sndNode = 1;
DataNode datanode = cluster.getDataNodes().get(sndNode);
// replicate the block to the second datanode
InetSocketAddress target = datanode.getSelfAddr();
Socket s = new Socket(target.getAddress(), target.getPort());
//write the header.
DataOutputStream out = new DataOutputStream(
s.getOutputStream());
out.writeShort( DataTransferProtocol.DATA_TRANSFER_VERSION );
out.write( DataTransferProtocol.OP_WRITE_BLOCK );
out.writeLong( block.getBlock().getBlockId());
out.writeLong( block.getBlock().getGenerationStamp() );
out.writeInt(1);
out.writeBoolean( false ); // recovery flag
Text.writeString( out, "" );
out.writeBoolean(false); // Not sending src node information
out.writeInt(0);
BlockTokenSecretManager.DUMMY_TOKEN.write(out);
// write check header
out.writeByte( 1 );
out.writeInt( 512 );
out.flush();
// close the connection before sending the content of the block
out.close();
// the temporary block & meta files should be deleted
String dataDir = cluster.getDataDirectory();
File dir1 = new File(new File(dataDir, "data"+(2*sndNode+1)), "tmp");
File dir2 = new File(new File(dataDir, "data"+(2*sndNode+2)), "tmp");
while (dir1.listFiles().length != 0 || dir2.listFiles().length != 0) {
Thread.sleep(100);
}
// then increase the file's replication factor
fs.setReplication(fileName, (short)2);
// replication should succeed
DFSTestUtil.waitReplication(fs, fileName, (short)1);
// clean up the file
fs.delete(fileName, false);
}
/**
* Check that the permissions of the local DN directories are as expected.
*/
@Test
public void testLocalDirs() throws Exception {
final String permStr = conf.get(
DataNode.DATA_DIR_PERMISSION_KEY);
FsPermission expected = new FsPermission(permStr);
// Check permissions on directories in 'dfs.data.dir'
FileSystem localFS = FileSystem.getLocal(conf);
for (DataNode dn : cluster.getDataNodes()) {
String[] dataDirs = dn.getConf().getStrings(DataNode.DATA_DIR_KEY);
for (String dir : dataDirs) {
Path dataDir = new Path(dir);
FsPermission actual = localFS.getFileStatus(dataDir).getPermission();
assertEquals("Permission for dir: " + dataDir, expected, actual);
}
}
}
}