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HDFS-7112. LazyWriter should use either async IO or one thread per physical disk. Contributed by Xiaoyu Yao.

This commit is contained in:
cnauroth 2014-10-07 20:25:19 -07:00
parent 60f0f6fcde
commit 1efd9c9825
8 changed files with 413 additions and 85 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -357,6 +357,8 @@ Trunk (Unreleased)
HDFS-7171. Fix Jenkins failures in HDFS-6581 branch. (Arpit Agarwal)
HDFS-7112. LazyWriter should use either async IO or one thread per physical
disk. (Xiaoyu Yao via cnauroth)
Release 2.7.0 - UNRELEASED

13
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java
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@ -42,6 +42,7 @@
import org.apache.hadoop.hdfs.server.datanode.ReplicaInPipelineInterface;
import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetFactory;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
import org.apache.hadoop.hdfs.server.datanode.metrics.FSDatasetMBean;
import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
@ -463,5 +464,15 @@ public HdfsBlocksMetadata getHdfsBlocksMetadata(String bpid,
public void submitBackgroundSyncFileRangeRequest(final ExtendedBlock block,
final FileDescriptor fd, final long offset, final long nbytes,
final int flags);
}
/**
* Callback from RamDiskAsyncLazyPersistService upon async lazy persist task end
*/
public void onCompleteLazyPersist(String bpId, long blockId,
long creationTime, File[] savedFiles, FsVolumeImpl targetVolume);
/**
* Callback from RamDiskAsyncLazyPersistService upon async lazy persist task fail
*/
public void onFailLazyPersist(String bpId, long blockId);
}

21
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
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@ -166,6 +166,10 @@ long getDfsUsed() throws IOException {
return dfsUsage.getUsed();
}
void incDfsUsed(long value) {
dfsUsage.incDfsUsed(value);
}
/**
* Read in the cached DU value and return it if it is less than 600 seconds
* old (DU update interval). Slight imprecision of dfsUsed is not critical
@ -270,23 +274,6 @@ File addFinalizedBlock(Block b, File f) throws IOException {
return blockFile;
}
/**
* Save the given replica to persistent storage.
*
* @return The saved meta and block files, in that order.
* @throws IOException
*/
File[] lazyPersistReplica(long blockId, long genStamp,
File srcMeta, File srcFile) throws IOException {
if (!lazypersistDir.exists() && !lazypersistDir.mkdirs()) {
FsDatasetImpl.LOG.warn("Failed to create " + lazypersistDir);
}
File targetFiles[] = FsDatasetImpl.copyBlockFiles(
blockId, genStamp, srcMeta, srcFile, lazypersistDir);
dfsUsage.incDfsUsed(targetFiles[0].length() + targetFiles[1].length());
return targetFiles;
}
/**
* Move a persisted replica from lazypersist directory to a subdirectory
* under finalized.

179
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
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@ -219,6 +219,7 @@ public LengthInputStream getMetaDataInputStream(ExtendedBlock b)
final ReplicaMap volumeMap;
final RamDiskReplicaTracker ramDiskReplicaTracker;
final RamDiskAsyncLazyPersistService asyncLazyPersistService;
private static final int MAX_BLOCK_EVICTIONS_PER_ITERATION = 3;
@ -272,10 +273,12 @@ public LengthInputStream getMetaDataInputStream(ExtendedBlock b)
VolumeChoosingPolicy.class), conf);
volumes = new FsVolumeList(volsFailed, blockChooserImpl);
asyncDiskService = new FsDatasetAsyncDiskService(datanode);
asyncLazyPersistService = new RamDiskAsyncLazyPersistService(datanode);
for (int idx = 0; idx < storage.getNumStorageDirs(); idx++) {
addVolume(dataLocations, storage.getStorageDir(idx));
}
setupAsyncLazyPersistThreads();
cacheManager = new FsDatasetCache(this);
@ -408,6 +411,8 @@ public void run() {
}
}
setupAsyncLazyPersistThreads();
for (int i = 0; i < volumes.size(); i++) {
if (successFlags[i]) {
succeedVolumes.add(volumes.get(i));
@ -461,6 +466,7 @@ public synchronized void removeVolumes(Collection<StorageLocation> volumes) {
storageMap.remove(sd.getStorageUuid());
}
}
setupAsyncLazyPersistThreads();
}
private StorageType getStorageTypeFromLocations(
@ -1505,10 +1511,11 @@ public void invalidate(String bpid, Block invalidBlks[]) throws IOException {
RamDiskReplica replicaInfo =
ramDiskReplicaTracker.getReplica(bpid, invalidBlks[i].getBlockId());
if (replicaInfo != null) {
if (replicaInfo.getIsPersisted() == false) {
if (!replicaInfo.getIsPersisted()) {
datanode.getMetrics().incrRamDiskBlocksDeletedBeforeLazyPersisted();
}
discardRamDiskReplica(replicaInfo, true);
ramDiskReplicaTracker.discardReplica(replicaInfo.getBlockPoolId(),
replicaInfo.getBlockId(), true);
}
}
@ -1750,6 +1757,10 @@ public void shutdown() {
asyncDiskService.shutdown();
}
if (asyncLazyPersistService != null) {
asyncLazyPersistService.shutdown();
}
if(volumes != null) {
volumes.shutdown();
}
@ -2307,6 +2318,40 @@ public RollingLogs createRollingLogs(String bpid, String prefix
return new RollingLogsImpl(dir, prefix);
}
@Override
public void onCompleteLazyPersist(String bpId, long blockId,
long creationTime, File[] savedFiles, FsVolumeImpl targetVolume) {
synchronized (FsDatasetImpl.this) {
ramDiskReplicaTracker.recordEndLazyPersist(bpId, blockId, savedFiles);
targetVolume.incDfsUsed(bpId,
savedFiles[0].length() + savedFiles[1].length());
// Update metrics (ignore the metadata file size)
datanode.getMetrics().incrRamDiskBlocksLazyPersisted();
datanode.getMetrics().incrRamDiskBytesLazyPersisted(savedFiles[1].length());
datanode.getMetrics().addRamDiskBlocksLazyPersistWindowMs(
Time.monotonicNow() - creationTime);
if (LOG.isDebugEnabled()) {
LOG.debug("LazyWriter: Finish persisting RamDisk block: "
+ " block pool Id: " + bpId + " block id: " + blockId
+ " to block file " + savedFiles[1] + " and meta file " + savedFiles[0]
+ " on target volume " + targetVolume);
}
}
}
@Override
public void onFailLazyPersist(String bpId, long blockId) {
RamDiskReplica block = null;
block = ramDiskReplicaTracker.getReplica(bpId, blockId);
if (block != null) {
LOG.warn("Failed to save replica " + block + ". re-enqueueing it.");
ramDiskReplicaTracker.reenqueueReplicaNotPersisted(block);
}
}
@Override
public void submitBackgroundSyncFileRangeRequest(ExtendedBlock block,
FileDescriptor fd, long offset, long nbytes, int flags) {
@ -2315,9 +2360,38 @@ public void submitBackgroundSyncFileRangeRequest(ExtendedBlock block,
nbytes, flags);
}
void discardRamDiskReplica(RamDiskReplica replica, boolean deleteSavedCopies) {
ramDiskReplicaTracker.discardReplica(replica.getBlockPoolId(),
replica.getBlockId(), deleteSavedCopies);
private boolean ramDiskConfigured() {
for (FsVolumeImpl v: getVolumes()){
if (v.isTransientStorage()) {
return true;
}
}
return false;
}
// Add/Remove per DISK volume async lazy persist thread when RamDisk volume is
// added or removed.
// This should only be called when the FsDataSetImpl#volumes list is finalized.
private void setupAsyncLazyPersistThreads() {
boolean ramDiskConfigured = ramDiskConfigured();
for (FsVolumeImpl v: getVolumes()){
// Skip transient volumes
if (v.isTransientStorage()) {
continue;
}
// Add thread for DISK volume if RamDisk is configured
if (ramDiskConfigured &&
!asyncLazyPersistService.queryVolume(v.getCurrentDir())) {
asyncLazyPersistService.addVolume(v.getCurrentDir());
}
// Remove thread for DISK volume if RamDisk is not configured
if (!ramDiskConfigured &&
asyncLazyPersistService.queryVolume(v.getCurrentDir())) {
asyncLazyPersistService.removeVolume(v.getCurrentDir());
}
}
}
class LazyWriter implements Runnable {
@ -2343,61 +2417,6 @@ public LazyWriter(Configuration conf) {
DFSConfigKeys.DFS_DATANODE_RAM_DISK_LOW_WATERMARK_REPLICAS_DEFAULT);
}
private void moveReplicaToNewVolume(String bpid, long blockId, long creationTime)
throws IOException {
FsVolumeImpl targetVolume;
ReplicaInfo replicaInfo;
BlockPoolSlice bpSlice;
File srcFile, srcMeta;
long genStamp;
synchronized (FsDatasetImpl.this) {
replicaInfo = volumeMap.get(bpid, blockId);
if (replicaInfo == null || !replicaInfo.getVolume().isTransientStorage()) {
// The block was either deleted before it could be checkpointed or
// it is already on persistent storage. This can occur if a second
// replica on persistent storage was found after the lazy write was
// scheduled.
return;
}
// Pick a target volume for the block.
targetVolume = volumes.getNextVolume(
StorageType.DEFAULT, replicaInfo.getNumBytes());
if (LOG.isDebugEnabled()) {
LOG.debug("LazyWriter starting to save blockId=" + blockId + "; bpid=" + bpid);
}
ramDiskReplicaTracker.recordStartLazyPersist(bpid, blockId, targetVolume);
bpSlice = targetVolume.getBlockPoolSlice(bpid);
srcMeta = replicaInfo.getMetaFile();
srcFile = replicaInfo.getBlockFile();
genStamp = replicaInfo.getGenerationStamp();
}
// Drop the FsDatasetImpl lock for the file copy.
File[] savedFiles =
bpSlice.lazyPersistReplica(blockId, genStamp, srcMeta, srcFile);
synchronized (FsDatasetImpl.this) {
ramDiskReplicaTracker.recordEndLazyPersist(bpid, blockId, savedFiles);
// Update metrics (ignore the metadata file size)
datanode.getMetrics().incrRamDiskBlocksLazyPersisted();
datanode.getMetrics().incrRamDiskBytesLazyPersisted(replicaInfo.getNumBytes());
datanode.getMetrics().addRamDiskBlocksLazyPersistWindowMs(
Time.monotonicNow() - creationTime);
if (LOG.isDebugEnabled()) {
LOG.debug("LazyWriter finished saving blockId=" + blockId + "; bpid=" + bpid +
" to file " + savedFiles[1]);
}
}
}
/**
* Checkpoint a pending replica to persistent storage now.
* If we fail then move the replica to the end of the queue.
@ -2405,13 +2424,43 @@ private void moveReplicaToNewVolume(String bpid, long blockId, long creationTime
*/
private boolean saveNextReplica() {
RamDiskReplica block = null;
FsVolumeImpl targetVolume;
ReplicaInfo replicaInfo;
boolean succeeded = false;
try {
block = ramDiskReplicaTracker.dequeueNextReplicaToPersist();
if (block != null) {
moveReplicaToNewVolume(block.getBlockPoolId(), block.getBlockId(),
block.getCreationTime());
synchronized (FsDatasetImpl.this) {
replicaInfo = volumeMap.get(block.getBlockPoolId(), block.getBlockId());
// If replicaInfo is null, the block was either deleted before
// it could be checkpointed or it is already on persistent storage.
// This can occur if a second replica on persistent storage was found
// after the lazy write was scheduled.
if (replicaInfo != null &&
replicaInfo.getVolume().isTransientStorage()) {
// Pick a target volume to persist the block.
targetVolume = volumes.getNextVolume(
StorageType.DEFAULT, replicaInfo.getNumBytes());
ramDiskReplicaTracker.recordStartLazyPersist(
block.getBlockPoolId(), block.getBlockId(), targetVolume);
if (LOG.isDebugEnabled()) {
LOG.debug("LazyWriter: Start persisting RamDisk block:"
+ " block pool Id: " + block.getBlockPoolId()
+ " block id: " + block.getBlockId()
+ " on target volume " + targetVolume);
}
asyncLazyPersistService.submitLazyPersistTask(
block.getBlockPoolId(), block.getBlockId(),
replicaInfo.getGenerationStamp(), block.getCreationTime(),
replicaInfo.getMetaFile(), replicaInfo.getBlockFile(),
targetVolume);
}
}
}
succeeded = true;
} catch(IOException ioe) {
@ -2419,10 +2468,9 @@ private boolean saveNextReplica() {
} finally {
if (!succeeded && block != null) {
LOG.warn("Failed to save replica " + block + ". re-enqueueing it.");
ramDiskReplicaTracker.reenqueueReplicaNotPersisted(block);
onFailLazyPersist(block.getBlockPoolId(), block.getBlockId());
}
}
return succeeded;
}
@ -2479,7 +2527,8 @@ private void evictBlocks() throws IOException {
metaFile = replicaInfo.getMetaFile();
blockFileUsed = blockFile.length();
metaFileUsed = metaFile.length();
discardRamDiskReplica(replicaState, false);
ramDiskReplicaTracker.discardReplica(replicaState.getBlockPoolId(),
replicaState.getBlockId(), false);
// Move the replica from lazyPersist/ to finalized/ on target volume
BlockPoolSlice bpSlice =

13
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
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@ -125,6 +125,10 @@ File getRbwDir(String bpid) throws IOException {
return getBlockPoolSlice(bpid).getRbwDir();
}
File getLazyPersistDir(String bpid) throws IOException {
return getBlockPoolSlice(bpid).getLazypersistDir();
}
void decDfsUsed(String bpid, long value) {
synchronized(dataset) {
BlockPoolSlice bp = bpSlices.get(bpid);
@ -134,6 +138,15 @@ void decDfsUsed(String bpid, long value) {
}
}
void incDfsUsed(String bpid, long value) {
synchronized(dataset) {
BlockPoolSlice bp = bpSlices.get(bpid);
if (bp != null) {
bp.incDfsUsed(value);
}
}
}
long getDfsUsed() throws IOException {
long dfsUsed = 0;
synchronized(dataset) {

252
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/RamDiskAsyncLazyPersistService.java Normal file
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@ -0,0 +1,252 @@
/**
* 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.fsdataset.impl;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* This class is a container of multiple thread pools, one for each non-RamDisk
* volume with a maximum thread count of 1 so that we can schedule async lazy
* persist operations easily with volume arrival and departure handled.
*
* This class and {@link org.apache.hadoop.util.AsyncDiskService} are similar.
* They should be combined.
*/
class RamDiskAsyncLazyPersistService {
public static final Log LOG = LogFactory.getLog(RamDiskAsyncLazyPersistService.class);
// ThreadPool core pool size
private static final int CORE_THREADS_PER_VOLUME = 1;
// ThreadPool maximum pool size
private static final int MAXIMUM_THREADS_PER_VOLUME = 1;
// ThreadPool keep-alive time for threads over core pool size
private static final long THREADS_KEEP_ALIVE_SECONDS = 60;
private final DataNode datanode;
private final ThreadGroup threadGroup;
private Map<File, ThreadPoolExecutor> executors
= new HashMap<File, ThreadPoolExecutor>();
/**
* Create a RamDiskAsyncLazyPersistService with a set of volumes (specified by their
* root directories).
*
* The RamDiskAsyncLazyPersistService uses one ThreadPool per volume to do the async
* disk operations.
*/
RamDiskAsyncLazyPersistService(DataNode datanode) {
this.datanode = datanode;
this.threadGroup = new ThreadGroup(getClass().getSimpleName());
}
private void addExecutorForVolume(final File volume) {
ThreadFactory threadFactory = new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(threadGroup, r);
t.setName("Async RamDisk lazy persist worker for volume " + volume);
return t;
}
};
ThreadPoolExecutor executor = new ThreadPoolExecutor(
CORE_THREADS_PER_VOLUME, MAXIMUM_THREADS_PER_VOLUME,
THREADS_KEEP_ALIVE_SECONDS, TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(), threadFactory);
// This can reduce the number of running threads
executor.allowCoreThreadTimeOut(true);
executors.put(volume, executor);
}
/**
* Starts AsyncLazyPersistService for a new volume
* @param volume the root of the new data volume.
*/
synchronized void addVolume(File volume) {
if (executors == null) {
throw new RuntimeException("AsyncLazyPersistService is already shutdown");
}
ThreadPoolExecutor executor = executors.get(volume);
if (executor != null) {
throw new RuntimeException("Volume " + volume + " is already existed.");
}
addExecutorForVolume(volume);
}
/**
* Stops AsyncLazyPersistService for a volume.
* @param volume the root of the volume.
*/
synchronized void removeVolume(File volume) {
if (executors == null) {
throw new RuntimeException("AsyncDiskService is already shutdown");
}
ThreadPoolExecutor executor = executors.get(volume);
if (executor == null) {
throw new RuntimeException("Can not find volume " + volume
+ " to remove.");
} else {
executor.shutdown();
executors.remove(volume);
}
}
/**
* Query if the thread pool exist for the volume
* @param volume the root of a volume
* @return true if there is one thread pool for the volume
* false otherwise
*/
synchronized boolean queryVolume(File volume) {
if (executors == null) {
throw new RuntimeException("AsyncLazyPersistService is already shutdown");
}
ThreadPoolExecutor executor = executors.get(volume);
return (executor != null);
}
/**
* Execute the task sometime in the future, using ThreadPools.
*/
synchronized void execute(File root, Runnable task) {
if (executors == null) {
throw new RuntimeException("AsyncLazyPersistService is already shutdown");
}
ThreadPoolExecutor executor = executors.get(root);
if (executor == null) {
throw new RuntimeException("Cannot find root " + root
+ " for execution of task " + task);
} else {
executor.execute(task);
}
}
/**
* Gracefully shut down all ThreadPool. Will wait for all lazy persist
* tasks to finish.
*/
synchronized void shutdown() {
if (executors == null) {
LOG.warn("AsyncLazyPersistService has already shut down.");
} else {
LOG.info("Shutting down all async lazy persist service threads");
for (Map.Entry<File, ThreadPoolExecutor> e : executors.entrySet()) {
e.getValue().shutdown();
}
// clear the executor map so that calling execute again will fail.
executors = null;
LOG.info("All async lazy persist service threads have been shut down");
}
}
/**
* Asynchronously lazy persist the block from the RamDisk to Disk.
*/
void submitLazyPersistTask(String bpId, long blockId,
long genStamp, long creationTime,
File metaFile, File blockFile,
FsVolumeImpl targetVolume) throws IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("LazyWriter schedule async task to persist RamDisk block pool id: "
+ bpId + " block id: " + blockId);
}
File lazyPersistDir = targetVolume.getLazyPersistDir(bpId);
if (!lazyPersistDir.exists() && !lazyPersistDir.mkdirs()) {
FsDatasetImpl.LOG.warn("LazyWriter failed to create " + lazyPersistDir);
throw new IOException("LazyWriter fail to find or create lazy persist dir: "
+ lazyPersistDir.toString());
}
ReplicaLazyPersistTask lazyPersistTask = new ReplicaLazyPersistTask(
bpId, blockId, genStamp, creationTime, blockFile, metaFile,
targetVolume, lazyPersistDir);
execute(targetVolume.getCurrentDir(), lazyPersistTask);
}
class ReplicaLazyPersistTask implements Runnable {
final String bpId;
final long blockId;
final long genStamp;
final long creationTime;
final File blockFile;
final File metaFile;
final FsVolumeImpl targetVolume;
final File lazyPersistDir;
ReplicaLazyPersistTask(String bpId, long blockId,
long genStamp, long creationTime,
File blockFile, File metaFile,
FsVolumeImpl targetVolume, File lazyPersistDir) {
this.bpId = bpId;
this.blockId = blockId;
this.genStamp = genStamp;
this.creationTime = creationTime;
this.blockFile = blockFile;
this.metaFile = metaFile;
this.targetVolume = targetVolume;
this.lazyPersistDir = lazyPersistDir;
}
@Override
public String toString() {
// Called in AsyncLazyPersistService.execute for displaying error messages.
return "LazyWriter async task of persist RamDisk block pool id:"
+ bpId + " block pool id: "
+ blockId + " with block file " + blockFile
+ " and meta file " + metaFile + " to target volume " + targetVolume;}
@Override
public void run() {
boolean succeeded = false;
try {
// No FsDatasetImpl lock for the file copy
File targetFiles[] = FsDatasetImpl.copyBlockFiles(
blockId, genStamp, metaFile, blockFile, lazyPersistDir);
// Lock FsDataSetImpl during onCompleteLazyPersist callback
datanode.getFSDataset().onCompleteLazyPersist(bpId, blockId,
creationTime, targetFiles, targetVolume);
succeeded = true;
} catch (Exception e){
FsDatasetImpl.LOG.warn(
"LazyWriter failed to async persist RamDisk block pool id: "
+ bpId + "block Id: " + blockId);
} finally {
if (!succeeded) {
datanode.getFSDataset().onFailLazyPersist(bpId, blockId);
}
}
}
}
}

12
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
View File

@ -49,6 +49,7 @@
import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaInputStreams;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.RollingLogs;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
import org.apache.hadoop.hdfs.server.datanode.metrics.FSDatasetMBean;
import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
@ -1209,5 +1210,16 @@ public void submitBackgroundSyncFileRangeRequest(ExtendedBlock block,
FileDescriptor fd, long offset, long nbytes, int flags) {
throw new UnsupportedOperationException();
}
@Override
public void onCompleteLazyPersist(String bpId, long blockId,
long creationTime, File[] savedFiles, FsVolumeImpl targetVolume) {
throw new UnsupportedOperationException();
}
@Override
public void onFailLazyPersist(String bpId, long blockId) {
throw new UnsupportedOperationException();
}
}

4
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistFiles.java
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@ -971,7 +971,9 @@ JMXGet initJMX() throws Exception
void printRamDiskJMXMetrics() {
try {
jmx.printAllMatchedAttributes(JMX_RAM_DISK_METRICS_PATTERN);
if (jmx != null) {
jmx.printAllMatchedAttributes(JMX_RAM_DISK_METRICS_PATTERN);
}
} catch (Exception e) {
e.printStackTrace();
}