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HDFS-4465. Optimize datanode ReplicasMap and ReplicaInfo. Contributed by Aaron T. Myers. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1499659 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2013-07-04 05:52:13 +00:00
parent 33fe54a25f
commit 5428bfbf53
5 changed files with 152 additions and 21 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -426,6 +426,8 @@ Release 2.1.0-beta - 2013-07-02
OPTIMIZATIONS
HDFS-4465. Optimize datanode ReplicasMap and ReplicaInfo. (atm)
BUG FIXES
HDFS-4626. ClientProtocol#getLinkTarget should throw an exception for

5
hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml
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@ -325,4 +325,9 @@
<Field name="modification" />
<Bug pattern="VO_VOLATILE_INCREMENT" />
</Match>
<Match>
<Class name="org.apache.hadoop.hdfs.server.datanode.ReplicaInfo" />
<Method name="setDirInternal" />
<Bug pattern="DM_STRING_CTOR" />
</Match>
</FindBugsFilter>

53
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceScanner.java
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@ -29,7 +29,6 @@ import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.atomic.AtomicInteger;
@ -49,6 +48,9 @@ import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.RollingLogs;
import org.apache.hadoop.hdfs.util.DataTransferThrottler;
import org.apache.hadoop.hdfs.util.GSet;
import org.apache.hadoop.hdfs.util.LightWeightGSet;
import org.apache.hadoop.hdfs.util.LightWeightGSet.LinkedElement;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.Time;
@ -82,8 +84,9 @@ class BlockPoolSliceScanner {
private final SortedSet<BlockScanInfo> blockInfoSet
= new TreeSet<BlockScanInfo>(BlockScanInfo.LAST_SCAN_TIME_COMPARATOR);
private final Map<Block, BlockScanInfo> blockMap
= new HashMap<Block, BlockScanInfo>();
private final GSet<Block, BlockScanInfo> blockMap
= new LightWeightGSet<Block, BlockScanInfo>(
LightWeightGSet.computeCapacity(0.5, "BlockMap"));
// processedBlocks keeps track of which blocks are scanned
// since the last run.
@ -107,8 +110,14 @@ class BlockPoolSliceScanner {
VERIFICATION_SCAN, // scanned as part of periodic verfication
NONE,
}
static class BlockScanInfo {
// Extend Block because in the DN process there's a 1-to-1 correspondence of
// BlockScanInfo to Block instances, so by extending rather than containing
// Block, we can save a bit of Object overhead (about 24 bytes per block
// replica.)
static class BlockScanInfo extends Block
implements LightWeightGSet.LinkedElement {
/** Compare the info by the last scan time. */
static final Comparator<BlockScanInfo> LAST_SCAN_TIME_COMPARATOR
= new Comparator<BlockPoolSliceScanner.BlockScanInfo>() {
@ -121,18 +130,18 @@ class BlockPoolSliceScanner {
}
};
final Block block;
long lastScanTime = 0;
ScanType lastScanType = ScanType.NONE;
boolean lastScanOk = true;
private LinkedElement next;
BlockScanInfo(Block block) {
this.block = block;
super(block);
}
@Override
public int hashCode() {
return block.hashCode();
return super.hashCode();
}
@Override
@ -142,12 +151,22 @@ class BlockPoolSliceScanner {
} else if (that == null || !(that instanceof BlockScanInfo)) {
return false;
}
return block.equals(((BlockScanInfo)that).block);
return super.equals(that);
}
long getLastScanTime() {
return (lastScanType == ScanType.NONE) ? 0 : lastScanTime;
}
@Override
public void setNext(LinkedElement next) {
this.next = next;
}
@Override
public LinkedElement getNext() {
return next;
}
}
BlockPoolSliceScanner(String bpid, DataNode datanode,
@ -203,19 +222,19 @@ class BlockPoolSliceScanner {
private synchronized void addBlockInfo(BlockScanInfo info) {
boolean added = blockInfoSet.add(info);
blockMap.put(info.block, info);
blockMap.put(info);
if (added) {
updateBytesToScan(info.block.getNumBytes(), info.lastScanTime);
updateBytesToScan(info.getNumBytes(), info.lastScanTime);
}
}
private synchronized void delBlockInfo(BlockScanInfo info) {
boolean exists = blockInfoSet.remove(info);
blockMap.remove(info.block);
blockMap.remove(info);
if (exists) {
updateBytesToScan(-info.block.getNumBytes(), info.lastScanTime);
updateBytesToScan(-info.getNumBytes(), info.lastScanTime);
}
}
@ -464,7 +483,7 @@ class BlockPoolSliceScanner {
private synchronized boolean isFirstBlockProcessed() {
if (!blockInfoSet.isEmpty()) {
long blockId = blockInfoSet.first().block.getBlockId();
long blockId = blockInfoSet.first().getBlockId();
if ((processedBlocks.get(blockId) != null)
&& (processedBlocks.get(blockId) == 1)) {
return true;
@ -478,7 +497,7 @@ class BlockPoolSliceScanner {
Block block = null;
synchronized (this) {
if (!blockInfoSet.isEmpty()) {
block = blockInfoSet.first().block;
block = blockInfoSet.first();
}
}
if ( block != null ) {
@ -520,7 +539,7 @@ class BlockPoolSliceScanner {
entry.genStamp));
if (info != null) {
if (processedBlocks.get(entry.blockId) == null) {
updateBytesLeft(-info.block.getNumBytes());
updateBytesLeft(-info.getNumBytes());
processedBlocks.put(entry.blockId, 1);
}
if (logIterator.isPrevious()) {
@ -712,7 +731,7 @@ class BlockPoolSliceScanner {
(info.lastScanType == ScanType.VERIFICATION_SCAN) ? "local" : "none";
buffer.append(String.format("%-26s : status : %-6s type : %-6s" +
" scan time : " +
"%-15d %s%n", info.block,
"%-15d %s%n", info,
(info.lastScanOk ? "ok" : "failed"),
scanType, scanTime,
(scanTime <= 0) ? "not yet verified" :

92
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ReplicaInfo.java
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@ -21,6 +21,10 @@ import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.FileUtil;
@ -29,16 +33,33 @@ import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.io.IOUtils;
import com.google.common.annotations.VisibleForTesting;
/**
* This class is used by datanodes to maintain meta data of its replicas.
* It provides a general interface for meta information of a replica.
*/
@InterfaceAudience.Private
abstract public class ReplicaInfo extends Block implements Replica {
/** volume where the replica belongs */
private FsVolumeSpi volume;
/** directory where block & meta files belong */
private File dir;
/**
* Base directory containing numerically-identified sub directories and
* possibly blocks.
*/
private File baseDir;
/**
* Ints representing the sub directory path from base dir to the directory
* containing this replica.
*/
private int[] subDirs;
private static final Map<String, File> internedBaseDirs = new HashMap<String, File>();
/**
* Constructor for a zero length replica
@ -74,7 +95,7 @@ abstract public class ReplicaInfo extends Block implements Replica {
FsVolumeSpi vol, File dir) {
super(blockId, len, genStamp);
this.volume = vol;
this.dir = dir;
setDirInternal(dir);
}
/**
@ -122,7 +143,18 @@ abstract public class ReplicaInfo extends Block implements Replica {
* @return the parent directory path where this replica is located
*/
File getDir() {
return dir;
if (subDirs == null) {
return null;
}
StringBuilder sb = new StringBuilder();
for (int i : subDirs) {
sb.append(DataStorage.BLOCK_SUBDIR_PREFIX);
sb.append(i);
sb.append("/");
}
File ret = new File(baseDir, sb.toString());
return ret;
}
/**
@ -130,7 +162,59 @@ abstract public class ReplicaInfo extends Block implements Replica {
* @param dir the parent directory where the replica is located
*/
public void setDir(File dir) {
this.dir = dir;
setDirInternal(dir);
}
private void setDirInternal(File dir) {
if (dir == null) {
subDirs = null;
baseDir = null;
return;
}
ReplicaDirInfo replicaDirInfo = parseSubDirs(dir);
this.subDirs = replicaDirInfo.subDirs;
synchronized (internedBaseDirs) {
if (!internedBaseDirs.containsKey(replicaDirInfo.baseDirPath)) {
// Create a new String path of this file and make a brand new File object
// to guarantee we drop the reference to the underlying char[] storage.
File baseDir = new File(new String(replicaDirInfo.baseDirPath));
internedBaseDirs.put(replicaDirInfo.baseDirPath, baseDir);
}
this.baseDir = internedBaseDirs.get(replicaDirInfo.baseDirPath);
}
}
@VisibleForTesting
public static class ReplicaDirInfo {
@VisibleForTesting
public String baseDirPath;
@VisibleForTesting
public int[] subDirs;
}
@VisibleForTesting
public static ReplicaDirInfo parseSubDirs(File dir) {
ReplicaDirInfo ret = new ReplicaDirInfo();
File currentDir = dir;
List<Integer> subDirList = new ArrayList<Integer>();
while (currentDir.getName().startsWith(DataStorage.BLOCK_SUBDIR_PREFIX)) {
// Prepend the integer into the list.
subDirList.add(0, Integer.parseInt(currentDir.getName().replaceFirst(
DataStorage.BLOCK_SUBDIR_PREFIX, "")));
currentDir = currentDir.getParentFile();
}
ret.subDirs = new int[subDirList.size()];
for (int i = 0; i < subDirList.size(); i++) {
ret.subDirs[i] = subDirList.get(i);
}
ret.baseDirPath = currentDir.getAbsolutePath();
return ret;
}
/**

21
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDatanodeBlockScanner.java
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@ -18,6 +18,7 @@
package org.apache.hadoop.hdfs;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
@ -43,6 +44,7 @@ import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.Time;
@ -437,4 +439,23 @@ public class TestDatanodeBlockScanner {
blockFile = MiniDFSCluster.getBlockFile(dnIndex, blk);
}
}
private static final String BASE_PATH = "/data/current/finalized";
@Test
public void testReplicaInfoParsing() throws Exception {
testReplicaInfoParsingSingle(BASE_PATH, new int[0]);
testReplicaInfoParsingSingle(BASE_PATH + "/subdir1", new int[]{1});
testReplicaInfoParsingSingle(BASE_PATH + "/subdir43", new int[]{43});
testReplicaInfoParsingSingle(BASE_PATH + "/subdir1/subdir2/subdir3", new int[]{1, 2, 3});
testReplicaInfoParsingSingle(BASE_PATH + "/subdir1/subdir2/subdir43", new int[]{1, 2, 43});
testReplicaInfoParsingSingle(BASE_PATH + "/subdir1/subdir23/subdir3", new int[]{1, 23, 3});
testReplicaInfoParsingSingle(BASE_PATH + "/subdir13/subdir2/subdir3", new int[]{13, 2, 3});
}
private static void testReplicaInfoParsingSingle(String subDirPath, int[] expectedSubDirs) {
File testFile = new File(subDirPath);
assertArrayEquals(expectedSubDirs, ReplicaInfo.parseSubDirs(testFile).subDirs);
assertEquals(BASE_PATH, ReplicaInfo.parseSubDirs(testFile).baseDirPath);
}
}