/**
* 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.blockmanagement;
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 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.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.CachedFullPathNames;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.CachedLocatedBlocks;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.FileType;
import org.apache.hadoop.hdfs.server.namenode.FSInodeInfo;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.NameNodeRaidTestUtil;
import org.apache.hadoop.hdfs.server.namenode.NameNodeRaidUtil;
import org.apache.hadoop.net.NetworkTopology;
import org.apache.hadoop.raid.RaidNode;
import org.junit.Assert;
import org.junit.Test;
public class TestBlockPlacementPolicyRaid {
private Configuration conf = null;
private MiniDFSCluster cluster = null;
private FSNamesystem namesystem = null;
private BlockManager blockManager;
private NetworkTopology networktopology;
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(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 1000L);
conf.set("dfs.replication.pending.timeout.sec", "2");
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1L);
conf.set("dfs.block.replicator.classname",
BlockPlacementPolicyRaid.class.getName());
conf.set(RaidNode.STRIPE_LENGTH_KEY, "2");
conf.set(RaidNode.RS_PARITY_LENGTH_KEY, "3");
conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, 1);
// start the cluster with one datanode first
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).
format(true).racks(rack1).hosts(host1).build();
cluster.waitActive();
namesystem = cluster.getNameNode().getNamesystem();
blockManager = namesystem.getBlockManager();
networktopology = blockManager.getDatanodeManager().getNetworkTopology();
Assert.assertTrue("BlockPlacementPolicy type is not correct.",
blockManager.getBlockPlacementPolicy() instanceof BlockPlacementPolicyRaid);
policy = (BlockPlacementPolicyRaid)blockManager.getBlockPlacementPolicy();
fs = cluster.getFileSystem();
xorPrefix = RaidNode.xorDestinationPath(conf).toUri().getPath();
raidTempPrefix = RaidNode.xorTempPrefix(conf);
raidrsTempPrefix = RaidNode.rsTempPrefix(conf);
raidrsHarTempPrefix = RaidNode.rsHarTempPrefix(conf);
}
/**
* Test that the parity files will be placed at the good locations when we
* create them.
*/
@Test
public void testChooseTargetForRaidFile() throws IOException {
setupCluster();
try {
String src = "/dir/file";
String parity = raidrsTempPrefix + src;
DFSTestUtil.createFile(fs, new Path(src), 4, (short)1, 0L);
DFSTestUtil.waitReplication(fs, new Path(src), (short)1);
refreshPolicy();
setBlockPlacementPolicy(namesystem, policy);
// start 3 more datanodes
String[] racks = {"/rack2", "/rack2", "/rack2",
"/rack2", "/rack2", "/rack2"};
String[] hosts =
{"host2.rack2.com", "host3.rack2.com", "host4.rack2.com",
"host5.rack2.com", "host6.rack2.com", "host7.rack2.com"};
cluster.startDataNodes(conf, 6, true, null, racks, hosts, null);
int numBlocks = 6;
DFSTestUtil.createFile(fs, new Path(parity), numBlocks, (short)2, 0L);
DFSTestUtil.waitReplication(fs, new Path(parity), (short)2);
FileStatus srcStat = fs.getFileStatus(new Path(src));
BlockLocation[] srcLoc =
fs.getFileBlockLocations(srcStat, 0, srcStat.getLen());
FileStatus parityStat = fs.getFileStatus(new Path(parity));
BlockLocation[] parityLoc =
fs.getFileBlockLocations(parityStat, 0, parityStat.getLen());
int parityLen = RaidNode.rsParityLength(conf);
for (int i = 0; i < numBlocks / parityLen; i++) {
Set<String> locations = new HashSet<String>();
for (int j = 0; j < srcLoc.length; j++) {
String [] names = srcLoc[j].getNames();
for (int k = 0; k < names.length; k++) {
LOG.info("Source block location: " + names[k]);
locations.add(names[k]);
}
}
for (int j = 0 ; j < parityLen; j++) {
String[] names = parityLoc[j + i * parityLen].getNames();
for (int k = 0; k < names.length; k++) {
LOG.info("Parity block location: " + names[k]);
Assert.assertTrue(locations.add(names[k]));
}
}
}
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Test that the har parity files will be placed at the good locations when we
* create them.
*/
@Test
public void testChooseTargetForHarRaidFile() throws IOException {
setupCluster();
try {
String[] racks = {"/rack2", "/rack2", "/rack2",
"/rack2", "/rack2", "/rack2"};
String[] hosts =
{"host2.rack2.com", "host3.rack2.com", "host4.rack2.com",
"host5.rack2.com", "host6.rack2.com", "host7.rack2.com"};
cluster.startDataNodes(conf, 6, true, null, racks, hosts, null);
String harParity = raidrsHarTempPrefix + "/dir/file";
int numBlocks = 11;
DFSTestUtil.createFile(fs, new Path(harParity), numBlocks, (short)1, 0L);
DFSTestUtil.waitReplication(fs, new Path(harParity), (short)1);
FileStatus stat = fs.getFileStatus(new Path(harParity));
BlockLocation[] loc = fs.getFileBlockLocations(stat, 0, stat.getLen());
int rsParityLength = RaidNode.rsParityLength(conf);
for (int i = 0; i < numBlocks - rsParityLength; i++) {
Set<String> locations = new HashSet<String>();
for (int j = 0; j < rsParityLength; j++) {
for (int k = 0; k < loc[i + j].getNames().length; k++) {
// verify that every adjacent 4 blocks are on differnt nodes
String name = loc[i + j].getNames()[k];
LOG.info("Har Raid block location: " + name);
Assert.assertTrue(locations.add(name));
}
}
}
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Test BlockPlacementPolicyRaid.CachedLocatedBlocks
* Verify that the results obtained from cache is the same as
* the results obtained directly
*/
@Test
public void testCachedBlocks() throws IOException {
setupCluster();
try {
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);
// test blocks cache
CachedLocatedBlocks cachedBlocks = new CachedLocatedBlocks(namesystem);
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);
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Test BlockPlacementPolicyRaid.CachedFullPathNames
* Verify that the results obtained from cache is the same as
* the results obtained directly
*/
@Test
public void testCachedPathNames() throws IOException {
setupCluster();
try {
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);
// test full path cache
CachedFullPathNames cachedFullPathNames =
new CachedFullPathNames(namesystem);
final FSInodeInfo[] inodes = NameNodeRaidTestUtil.getFSInodeInfo(
namesystem, file1, file2);
verifyCachedFullPathNameResult(cachedFullPathNames, inodes[0]);
verifyCachedFullPathNameResult(cachedFullPathNames, inodes[0]);
verifyCachedFullPathNameResult(cachedFullPathNames, inodes[1]);
verifyCachedFullPathNameResult(cachedFullPathNames, inodes[1]);
try {
Thread.sleep(1200L);
} catch (InterruptedException e) {
}
verifyCachedFullPathNameResult(cachedFullPathNames, inodes[1]);
verifyCachedFullPathNameResult(cachedFullPathNames, inodes[0]);
} 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, networktopology));
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.getBlockManager().setBlockPlacementPolicy(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, networktopology));
DatanodeDescriptor datanode1 = blockManager.getDatanodeManager(
).getDatanodeCyclicIteration("").iterator().next().getValue();
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(Map.Entry<String, DatanodeDescriptor> e : blockManager.getDatanodeManager(
).getDatanodeCyclicIteration("")) {
final DatanodeDescriptor d = e.getValue();
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, networktopology);
}
private void verifyCompanionBlocks(Collection<LocatedBlock> companionBlocks,
List<LocatedBlock> sourceBlocks, List<LocatedBlock> parityBlocks,
int[] sourceBlockIndexes, int[] parityBlockIndexes) {
Set<ExtendedBlock> blockSet = new HashSet<ExtendedBlock>();
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 {
String res1 = inode.getFullPathName();
String res2 = cachedFullPathNames.get(inode);
LOG.info("Actual path name: " + res1);
LOG.info("Cached path name: " + res2);
Assert.assertEquals(cachedFullPathNames.get(inode),
inode.getFullPathName());
}
private void verifyCachedBlocksResult(CachedLocatedBlocks cachedBlocks,
FSNamesystem namesystem, String file) throws IOException{
long len = NameNodeRaidUtil.getFileInfo(namesystem, file, true).getLen();
List<LocatedBlock> res1 = NameNodeRaidUtil.getBlockLocations(namesystem,
file, 0L, len, false, false).getLocatedBlocks();
List<LocatedBlock> res2 = cachedBlocks.get(file);
for (int i = 0; i < res1.size(); i++) {
LOG.info("Actual block: " + res1.get(i).getBlock());
LOG.info("Cached block: " + res2.get(i).getBlock());
Assert.assertEquals(res1.get(i).getBlock(), res2.get(i).getBlock());
}
}
private Collection<LocatedBlock> getCompanionBlocks(
FSNamesystem namesystem, BlockPlacementPolicyRaid policy,
ExtendedBlock block) throws IOException {
INodeFile inode = blockManager.blocksMap.getINode(block
.getLocalBlock());
FileType type = policy.getFileType(inode.getFullPathName());
return policy.getCompanionBlocks(inode.getFullPathName(), type,
block.getLocalBlock());
}
private List<LocatedBlock> getBlocks(FSNamesystem namesystem, String file)
throws IOException {
long len = NameNodeRaidUtil.getFileInfo(namesystem, file, true).getLen();
return NameNodeRaidUtil.getBlockLocations(namesystem,
file, 0, len, false, false).getLocatedBlocks();
}
}