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HDFS-6109 let sync_file_range() system call run in background (Liang Xie via stack)

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1599347 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2014-06-02 20:27:15 +00:00
parent 0aad2d56df
commit f15ff5e4f4
8 changed files with 65 additions and 4 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -464,6 +464,9 @@ Release 2.5.0 - UNRELEASED
HDFS-6110 adding more slow action log in critical write path
(Liang Xie via stack)
HDFS-6109 let sync_file_range() system call run in background
(Liang Xie via stack)
OPTIMIZATIONS
HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -111,6 +111,8 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final boolean DFS_DATANODE_DROP_CACHE_BEHIND_WRITES_DEFAULT = false;
public static final String DFS_DATANODE_SYNC_BEHIND_WRITES_KEY = "dfs.datanode.sync.behind.writes";
public static final boolean DFS_DATANODE_SYNC_BEHIND_WRITES_DEFAULT = false;
public static final String DFS_DATANODE_SYNC_BEHIND_WRITES_IN_BACKGROUND_KEY = "dfs.datanode.sync.behind.writes.in.background";
public static final boolean DFS_DATANODE_SYNC_BEHIND_WRITES_IN_BACKGROUND_DEFAULT = false;
public static final String DFS_DATANODE_DROP_CACHE_BEHIND_READS_KEY = "dfs.datanode.drop.cache.behind.reads";
public static final boolean DFS_DATANODE_DROP_CACHE_BEHIND_READS_DEFAULT = false;
public static final String DFS_DATANODE_USE_DN_HOSTNAME = "dfs.datanode.use.datanode.hostname";

18
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
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@ -104,6 +104,7 @@ class BlockReceiver implements Closeable {
private boolean dropCacheBehindWrites;
private long lastCacheManagementOffset = 0;
private boolean syncBehindWrites;
private boolean syncBehindWritesInBackground;
/** The client name. It is empty if a datanode is the client */
private final String clientname;
@ -207,6 +208,8 @@ class BlockReceiver implements Closeable {
datanode.getDnConf().dropCacheBehindWrites :
cachingStrategy.getDropBehind();
this.syncBehindWrites = datanode.getDnConf().syncBehindWrites;
this.syncBehindWritesInBackground = datanode.getDnConf().
syncBehindWritesInBackground;
final boolean isCreate = isDatanode || isTransfer
|| stage == BlockConstructionStage.PIPELINE_SETUP_CREATE;
@ -668,10 +671,17 @@ private void manageWriterOsCache(long offsetInBlock) {
// of file
//
if (syncBehindWrites) {
NativeIO.POSIX.syncFileRangeIfPossible(outFd,
lastCacheManagementOffset,
offsetInBlock - lastCacheManagementOffset,
NativeIO.POSIX.SYNC_FILE_RANGE_WRITE);
if (syncBehindWritesInBackground) {
this.datanode.getFSDataset().submitBackgroundSyncFileRangeRequest(
block, outFd, lastCacheManagementOffset,
offsetInBlock - lastCacheManagementOffset,
NativeIO.POSIX.SYNC_FILE_RANGE_WRITE);
} else {
NativeIO.POSIX.syncFileRangeIfPossible(outFd,
lastCacheManagementOffset, offsetInBlock
- lastCacheManagementOffset,
NativeIO.POSIX.SYNC_FILE_RANGE_WRITE);
}
}
//
// For POSIX_FADV_DONTNEED, we want to drop from the beginning

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DNConf.java
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@ -67,6 +67,7 @@ public class DNConf {
final boolean transferToAllowed;
final boolean dropCacheBehindWrites;
final boolean syncBehindWrites;
final boolean syncBehindWritesInBackground;
final boolean dropCacheBehindReads;
final boolean syncOnClose;
final boolean encryptDataTransfer;
@ -119,6 +120,9 @@ public DNConf(Configuration conf) {
syncBehindWrites = conf.getBoolean(
DFSConfigKeys.DFS_DATANODE_SYNC_BEHIND_WRITES_KEY,
DFSConfigKeys.DFS_DATANODE_SYNC_BEHIND_WRITES_DEFAULT);
syncBehindWritesInBackground = conf.getBoolean(
DFSConfigKeys.DFS_DATANODE_SYNC_BEHIND_WRITES_IN_BACKGROUND_KEY,
DFSConfigKeys.DFS_DATANODE_SYNC_BEHIND_WRITES_IN_BACKGROUND_DEFAULT);
dropCacheBehindReads = conf.getBoolean(
DFSConfigKeys.DFS_DATANODE_DROP_CACHE_BEHIND_READS_KEY,
DFSConfigKeys.DFS_DATANODE_DROP_CACHE_BEHIND_READS_DEFAULT);

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java
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@ -19,6 +19,7 @@
import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
@ -431,5 +432,12 @@ public HdfsBlocksMetadata getHdfsBlocksMetadata(String bpid,
* @return true when trash is enabled
*/
public boolean trashEnabled(String bpid);
/**
* submit a sync_file_range request to AsyncDiskService
*/
public void submitBackgroundSyncFileRangeRequest(final ExtendedBlock block,
final FileDescriptor fd, final long offset, final long nbytes,
final int flags);
}

19
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
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@ -19,6 +19,7 @@
package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
import java.io.File;
import java.io.FileDescriptor;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;
@ -31,6 +32,8 @@
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.apache.hadoop.io.nativeio.NativeIOException;
/**
* This class is a container of multiple thread pools, each for a volume,
@ -42,6 +45,7 @@
* can be slow, and we don't want to use a single thread pool because that
* is inefficient when we have more than 1 volume. AsyncDiskService is the
* solution for these.
* Another example of async disk operation is requesting sync_file_range().
*
* This class and {@link org.apache.hadoop.util.AsyncDiskService} are similar.
* They should be combined.
@ -148,6 +152,21 @@ synchronized void shutdown() {
}
}
public void submitSyncFileRangeRequest(FsVolumeImpl volume,
final FileDescriptor fd, final long offset, final long nbytes,
final int flags) {
execute(volume.getCurrentDir(), new Runnable() {
@Override
public void run() {
try {
NativeIO.POSIX.syncFileRangeIfPossible(fd, offset, nbytes, flags);
} catch (NativeIOException e) {
LOG.warn("sync_file_range error", e);
}
}
});
}
/**
* Delete the block file and meta file from the disk asynchronously, adjust
* dfsUsed statistics accordingly.

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
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@ -1907,5 +1907,13 @@ public RollingLogs createRollingLogs(String bpid, String prefix
}
return new RollingLogsImpl(dir, prefix);
}
@Override
public void submitBackgroundSyncFileRangeRequest(ExtendedBlock block,
FileDescriptor fd, long offset, long nbytes, int flags) {
FsVolumeImpl fsVolumeImpl = this.getVolume(block);
asyncDiskService.submitSyncFileRangeRequest(fsVolumeImpl, fd, offset,
nbytes, flags);
}
}

7
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
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@ -18,6 +18,7 @@
package org.apache.hadoop.hdfs.server.datanode;
import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@ -1112,5 +1113,11 @@ public RollingLogs createRollingLogs(String bpid, String prefix) {
public FsVolumeSpi getVolume(ExtendedBlock b) {
throw new UnsupportedOperationException();
}
@Override
public void submitBackgroundSyncFileRangeRequest(ExtendedBlock block,
FileDescriptor fd, long offset, long nbytes, int flags) {
throw new UnsupportedOperationException();
}
}