/**
* 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
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.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.hdfs.protocol.datatransfer.BlockConstructionStage;
import org.apache.hadoop.hdfs.protocol.datatransfer.Sender;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.util.DataChecksum;
import org.apache.hadoop.util.Time;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Test that datanodes can correctly handle errors during block read/write.
*/
public class TestDiskError {
private FileSystem fs;
private MiniDFSCluster cluster;
private Configuration conf;
@Before
public void setUp() throws Exception {
conf = new HdfsConfiguration();
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 512L);
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
cluster.waitActive();
fs = cluster.getFileSystem();
}
@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 bpid = cluster.getNamesystem().getBlockPoolId();
File storageDir = cluster.getInstanceStorageDir(dnIndex, 0);
File dir1 = MiniDFSCluster.getRbwDir(storageDir, bpid);
storageDir = cluster.getInstanceStorageDir(dnIndex, 1);
File dir2 = MiniDFSCluster.getRbwDir(storageDir, bpid);
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; dn.isDatanodeUp(); 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
FileUtil.setWritable(dir1, true);
FileUtil.setWritable(dir2, 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 {
// 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 = NameNodeAdapter.getBlockLocations(
cluster.getNameNode(), fileName.toString(), 0, (long)fileLen);
assertEquals("Should only find 1 block", 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.getXferAddress();
Socket s = new Socket(target.getAddress(), target.getPort());
// write the header.
DataOutputStream out = new DataOutputStream(s.getOutputStream());
DataChecksum checksum = DataChecksum.newDataChecksum(
DataChecksum.Type.CRC32, 512);
new Sender(out).writeBlock(block.getBlock(),
BlockTokenSecretManager.DUMMY_TOKEN, "",
new DatanodeInfo[0], null,
BlockConstructionStage.PIPELINE_SETUP_CREATE, 1, 0L, 0L, 0L,
checksum, CachingStrategy.newDefaultStrategy());
out.flush();
// close the connection before sending the content of the block
out.close();
// the temporary block & meta files should be deleted
String bpid = cluster.getNamesystem().getBlockPoolId();
File storageDir = cluster.getInstanceStorageDir(sndNode, 0);
File dir1 = MiniDFSCluster.getRbwDir(storageDir, bpid);
storageDir = cluster.getInstanceStorageDir(sndNode, 1);
File dir2 = MiniDFSCluster.getRbwDir(storageDir, bpid);
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 {
Configuration conf = new Configuration();
final String permStr = conf.get(
DFSConfigKeys.DFS_DATANODE_DATA_DIR_PERMISSION_KEY);
FsPermission expected = new FsPermission(permStr);
// Check permissions on directories in 'dfs.datanode.data.dir'
FileSystem localFS = FileSystem.getLocal(conf);
for (DataNode dn : cluster.getDataNodes()) {
for (FsVolumeSpi v : dn.getFSDataset().getVolumes()) {
String dir = v.getBasePath();
Path dataDir = new Path(dir);
FsPermission actual = localFS.getFileStatus(dataDir).getPermission();
assertEquals("Permission for dir: " + dataDir + ", is " + actual +
", while expected is " + expected, expected, actual);
}
}
}
/**
* Checks whether {@link DataNode#checkDiskError()} is being called or not.
* Before refactoring the code the above function was not getting called
* @throws IOException, InterruptedException
*/
@Test
public void testcheckDiskError() throws IOException, InterruptedException {
if(cluster.getDataNodes().size() <= 0) {
cluster.startDataNodes(conf, 1, true, null, null);
cluster.waitActive();
}
DataNode dataNode = cluster.getDataNodes().get(0);
long slackTime = dataNode.checkDiskErrorInterval/2;
//checking for disk error
dataNode.checkDiskError();
Thread.sleep(dataNode.checkDiskErrorInterval);
long lastDiskErrorCheck = dataNode.getLastDiskErrorCheck();
assertTrue("Disk Error check is not performed within " + dataNode.checkDiskErrorInterval + " ms", ((Time.monotonicNow()-lastDiskErrorCheck) < (dataNode.checkDiskErrorInterval + slackTime)));
}
}