/**
* 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 java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import junit.framework.Assert;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicyRaid.CachedFullPathNames;
import org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicyRaid.CachedLocatedBlocks;
import org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicyRaid.FileType;
import org.apache.hadoop.raid.RaidNode;
import org.junit.Test;
public class TestBlockPlacementPolicyRaid {
private Configuration conf = null;
private MiniDFSCluster cluster = null;
private FSNamesystem namesystem = null;
private BlockPlacementPolicyRaid policy = null;
private FileSystem fs = null;
String[] rack1 = {"/rack1"};
String[] rack2 = {"/rack2"};
String[] host1 = {"host1.rack1.com"};
String[] host2 = {"host2.rack2.com"};
String xorPrefix = null;
String raidTempPrefix = null;
String raidrsTempPrefix = null;
String raidrsHarTempPrefix = null;
final static Log LOG =
LogFactory.getLog(TestBlockPlacementPolicyRaid.class);
protected void setupCluster() throws IOException {
conf = new Configuration();
conf.setLong("dfs.blockreport.intervalMsec", 1000L);
conf.set("dfs.replication.pending.timeout.sec", "2");
conf.setLong("dfs.block.size", 1L);
conf.set("dfs.block.replicator.classname",
"org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicyRaid");
conf.set(RaidNode.STRIPE_LENGTH_KEY, "2");
conf.set(RaidNode.RS_PARITY_LENGTH_KEY, "3");
conf.setInt("io.bytes.per.checksum", 1);
// start the cluster with one datanode
cluster = new MiniDFSCluster(conf, 1, true, rack1, host1);
cluster.waitActive();
namesystem = cluster.getNameNode().getNamesystem();
Assert.assertTrue("BlockPlacementPolicy type is not correct.",
namesystem.replicator instanceof BlockPlacementPolicyRaid);
policy = (BlockPlacementPolicyRaid) namesystem.replicator;
fs = cluster.getFileSystem();
xorPrefix = RaidNode.xorDestinationPath(conf).toUri().getPath();
raidTempPrefix = RaidNode.xorTempPrefix(conf);
raidrsTempPrefix = RaidNode.rsTempPrefix(conf);
raidrsHarTempPrefix = RaidNode.rsHarTempPrefix(conf);
}
/**
* Test BlockPlacementPolicyRaid.CachedLocatedBlocks and
* BlockPlacementPolicyRaid.CachedFullPathNames
* Verify that the results obtained from cache is the same as
* the results obtained directly
*/
@Test
public void testCachedResults() throws IOException {
setupCluster();
try {
// test blocks cache
CachedLocatedBlocks cachedBlocks = new CachedLocatedBlocks(conf);
String file1 = "/dir/file1";
String file2 = "/dir/file2";
DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
try {
Thread.sleep(1200L);
} catch (InterruptedException e) {
}
verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
// test full path cache
CachedFullPathNames cachedFullPathNames = new CachedFullPathNames(conf);
FSInodeInfo inode1 = null;
FSInodeInfo inode2 = null;
namesystem.dir.readLock();
try {
inode1 = namesystem.dir.rootDir.getNode(file1);
inode2 = namesystem.dir.rootDir.getNode(file2);
} finally {
namesystem.dir.readUnlock();
}
verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
try {
Thread.sleep(1200L);
} catch (InterruptedException e) {
}
verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Test the result of getCompanionBlocks() on the unraided files
*/
@Test
public void testGetCompanionBLocks() throws IOException {
setupCluster();
try {
String file1 = "/dir/file1";
String file2 = "/raid/dir/file2";
String file3 = "/raidrs/dir/file3";
// Set the policy to default policy to place the block in the default way
setBlockPlacementPolicy(namesystem, new BlockPlacementPolicyDefault(
conf, namesystem, namesystem.clusterMap));
DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
DFSTestUtil.createFile(fs, new Path(file3), 8, (short)1, 0L);
Collection<LocatedBlock> companionBlocks;
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file1).get(0).getBlock());
Assert.assertTrue(companionBlocks == null || companionBlocks.size() == 0);
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file1).get(2).getBlock());
Assert.assertTrue(companionBlocks == null || companionBlocks.size() == 0);
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file2).get(0).getBlock());
Assert.assertEquals(1, companionBlocks.size());
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file2).get(3).getBlock());
Assert.assertEquals(1, companionBlocks.size());
int rsParityLength = RaidNode.rsParityLength(conf);
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file3).get(0).getBlock());
Assert.assertEquals(rsParityLength, companionBlocks.size());
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file3).get(4).getBlock());
Assert.assertEquals(rsParityLength, companionBlocks.size());
companionBlocks = getCompanionBlocks(
namesystem, policy, getBlocks(namesystem, file3).get(6).getBlock());
Assert.assertEquals(2, companionBlocks.size());
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
static void setBlockPlacementPolicy(
FSNamesystem namesystem, BlockPlacementPolicy policy) {
namesystem.writeLock();
try {
namesystem.replicator = policy;
} finally {
namesystem.writeUnlock();
}
}
/**
* Test BlockPlacementPolicyRaid actually deletes the correct replica.
* Start 2 datanodes and create 1 source file and its parity file.
* 1) Start host1, create the parity file with replication 1
* 2) Start host2, create the source file with replication 2
* 3) Set repliation of source file to 1
* Verify that the policy should delete the block with more companion blocks.
*/
@Test
public void testDeleteReplica() throws IOException {
setupCluster();
try {
// Set the policy to default policy to place the block in the default way
setBlockPlacementPolicy(namesystem, new BlockPlacementPolicyDefault(
conf, namesystem, namesystem.clusterMap));
DatanodeDescriptor datanode1 =
namesystem.datanodeMap.values().iterator().next();
String source = "/dir/file";
String parity = xorPrefix + source;
final Path parityPath = new Path(parity);
DFSTestUtil.createFile(fs, parityPath, 3, (short)1, 0L);
DFSTestUtil.waitReplication(fs, parityPath, (short)1);
// start one more datanode
cluster.startDataNodes(conf, 1, true, null, rack2, host2, null);
DatanodeDescriptor datanode2 = null;
for (DatanodeDescriptor d : namesystem.datanodeMap.values()) {
if (!d.getName().equals(datanode1.getName())) {
datanode2 = d;
}
}
Assert.assertTrue(datanode2 != null);
cluster.waitActive();
final Path sourcePath = new Path(source);
DFSTestUtil.createFile(fs, sourcePath, 5, (short)2, 0L);
DFSTestUtil.waitReplication(fs, sourcePath, (short)2);
refreshPolicy();
Assert.assertEquals(parity,
policy.getParityFile(source));
Assert.assertEquals(source,
policy.getSourceFile(parity, xorPrefix));
List<LocatedBlock> sourceBlocks = getBlocks(namesystem, source);
List<LocatedBlock> parityBlocks = getBlocks(namesystem, parity);
Assert.assertEquals(5, sourceBlocks.size());
Assert.assertEquals(3, parityBlocks.size());
// verify the result of getCompanionBlocks()
Collection<LocatedBlock> companionBlocks;
companionBlocks = getCompanionBlocks(
namesystem, policy, sourceBlocks.get(0).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{0, 1}, new int[]{0});
companionBlocks = getCompanionBlocks(
namesystem, policy, sourceBlocks.get(1).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{0, 1}, new int[]{0});
companionBlocks = getCompanionBlocks(
namesystem, policy, sourceBlocks.get(2).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{2, 3}, new int[]{1});
companionBlocks = getCompanionBlocks(
namesystem, policy, sourceBlocks.get(3).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{2, 3}, new int[]{1});
companionBlocks = getCompanionBlocks(
namesystem, policy, sourceBlocks.get(4).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{4}, new int[]{2});
companionBlocks = getCompanionBlocks(
namesystem, policy, parityBlocks.get(0).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{0, 1}, new int[]{0});
companionBlocks = getCompanionBlocks(
namesystem, policy, parityBlocks.get(1).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{2, 3}, new int[]{1});
companionBlocks = getCompanionBlocks(
namesystem, policy, parityBlocks.get(2).getBlock());
verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
new int[]{4}, new int[]{2});
// Set the policy back to raid policy. We have to create a new object
// here to clear the block location cache
refreshPolicy();
setBlockPlacementPolicy(namesystem, policy);
// verify policy deletes the correct blocks. companion blocks should be
// evenly distributed.
fs.setReplication(sourcePath, (short)1);
DFSTestUtil.waitReplication(fs, sourcePath, (short)1);
Map<String, Integer> counters = new HashMap<String, Integer>();
refreshPolicy();
for (int i = 0; i < parityBlocks.size(); i++) {
companionBlocks = getCompanionBlocks(
namesystem, policy, parityBlocks.get(i).getBlock());
counters = BlockPlacementPolicyRaid.countCompanionBlocks(
companionBlocks, false);
Assert.assertTrue(counters.get(datanode1.getName()) >= 1 &&
counters.get(datanode1.getName()) <= 2);
Assert.assertTrue(counters.get(datanode1.getName()) +
counters.get(datanode2.getName()) ==
companionBlocks.size());
counters = BlockPlacementPolicyRaid.countCompanionBlocks(
companionBlocks, true);
Assert.assertTrue(counters.get(datanode1.getParent().getName()) >= 1 &&
counters.get(datanode1.getParent().getName()) <= 2);
Assert.assertTrue(counters.get(datanode1.getParent().getName()) +
counters.get(datanode2.getParent().getName()) ==
companionBlocks.size());
}
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
// create a new BlockPlacementPolicyRaid to clear the cache
private void refreshPolicy() {
policy = new BlockPlacementPolicyRaid();
policy.initialize(conf, namesystem, namesystem.clusterMap);
}
private void verifyCompanionBlocks(Collection<LocatedBlock> companionBlocks,
List<LocatedBlock> sourceBlocks, List<LocatedBlock> parityBlocks,
int[] sourceBlockIndexes, int[] parityBlockIndexes) {
Set<Block> blockSet = new HashSet<Block>();
for (LocatedBlock b : companionBlocks) {
blockSet.add(b.getBlock());
}
Assert.assertEquals(sourceBlockIndexes.length + parityBlockIndexes.length,
blockSet.size());
for (int index : sourceBlockIndexes) {
Assert.assertTrue(blockSet.contains(sourceBlocks.get(index).getBlock()));
}
for (int index : parityBlockIndexes) {
Assert.assertTrue(blockSet.contains(parityBlocks.get(index).getBlock()));
}
}
private void verifyCachedFullPathNameResult(
CachedFullPathNames cachedFullPathNames, FSInodeInfo inode)
throws IOException {
Assert.assertEquals(cachedFullPathNames.get(inode),
inode.getFullPathName());
}
private void verifyCachedBlocksResult(CachedLocatedBlocks cachedBlocks,
FSNamesystem namesystem, String file) throws IOException{
long len = namesystem.getFileInfo(file).getLen();
List<LocatedBlock> res1 =
namesystem.getBlockLocations(file, 0L, len).getLocatedBlocks();
List<LocatedBlock> res2 = cachedBlocks.get(file);
for (int i = 0; i < res1.size(); i++) {
Assert.assertEquals(res1.get(i).getBlock(), res2.get(i).getBlock());
}
}
private Collection<LocatedBlock> getCompanionBlocks(
FSNamesystem namesystem, BlockPlacementPolicyRaid policy,
Block block) throws IOException {
INodeFile inode = namesystem.blocksMap.getINode(block);
FileType type = policy.getFileType(inode.getFullPathName());
return policy.getCompanionBlocks(inode.getFullPathName(), type, block);
}
private List<LocatedBlock> getBlocks(FSNamesystem namesystem, String file)
throws IOException {
FileStatus stat = namesystem.getFileInfo(file);
return namesystem.getBlockLocations(
file, 0, stat.getLen()).getLocatedBlocks();
}
}