HDFS-10884: [SPS]: Add block movement tracker to track the completion of block movement future tasks at DN. Contributed by Rakesh R

This commit is contained in:
Uma Maheswara Rao G 2016-10-25 00:40:45 -07:00 committed by Uma Maheswara Rao Gangumalla
parent e2a15d18bb
commit 24add8c2f8
4 changed files with 426 additions and 98 deletions

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@ -0,0 +1,146 @@
/**
* 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;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlocksMovementsCompletionHandler;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlockMovementResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is used to track the completion of block movement future tasks.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class BlockStorageMovementTracker implements Runnable {
private static final Logger LOG = LoggerFactory
.getLogger(BlockStorageMovementTracker.class);
private final CompletionService<BlockMovementResult> moverCompletionService;
private final BlocksMovementsCompletionHandler blksMovementscompletionHandler;
// Keeps the information - trackID vs its list of blocks
private final Map<Long, List<Future<BlockMovementResult>>> moverTaskFutures;
private final Map<Long, List<BlockMovementResult>> movementResults;
/**
* BlockStorageMovementTracker constructor.
*
* @param moverCompletionService
* completion service.
* @param handler
* blocks movements completion handler
*/
public BlockStorageMovementTracker(
CompletionService<BlockMovementResult> moverCompletionService,
BlocksMovementsCompletionHandler handler) {
this.moverCompletionService = moverCompletionService;
this.moverTaskFutures = new HashMap<>();
this.blksMovementscompletionHandler = handler;
this.movementResults = new HashMap<>();
}
@Override
public void run() {
while (true) {
if (moverTaskFutures.size() <= 0) {
try {
synchronized (moverTaskFutures) {
// Waiting for mover tasks.
moverTaskFutures.wait(2000);
}
} catch (InterruptedException ignore) {
// ignore
}
}
try {
Future<BlockMovementResult> future = moverCompletionService.take();
if (future != null) {
BlockMovementResult result = future.get();
LOG.debug("Completed block movement. {}", result);
long trackId = result.getTrackId();
List<Future<BlockMovementResult>> blocksMoving = moverTaskFutures
.get(trackId);
blocksMoving.remove(future);
List<BlockMovementResult> resultPerTrackIdList =
addMovementResultToTrackIdList(result);
// Completed all the scheduled blocks movement under this 'trackId'.
if (blocksMoving.isEmpty()) {
synchronized (moverTaskFutures) {
moverTaskFutures.remove(trackId);
}
// handle completed blocks movements per trackId.
blksMovementscompletionHandler.handle(resultPerTrackIdList);
movementResults.remove(trackId);
}
}
} catch (ExecutionException | InterruptedException e) {
// TODO: Do we need failure retries and implement the same if required.
LOG.error("Exception while moving block replica to target storage type",
e);
}
}
}
private List<BlockMovementResult> addMovementResultToTrackIdList(
BlockMovementResult result) {
long trackId = result.getTrackId();
List<BlockMovementResult> perTrackIdList = movementResults.get(trackId);
if (perTrackIdList == null) {
perTrackIdList = new ArrayList<>();
movementResults.put(trackId, perTrackIdList);
}
perTrackIdList.add(result);
return perTrackIdList;
}
/**
* Add future task to the tracking list to check the completion status of the
* block movement.
*
* @param trackID
* tracking Id
* @param futureTask
* future task used for moving the respective block
*/
void addBlock(long trackID, Future<BlockMovementResult> futureTask) {
synchronized (moverTaskFutures) {
List<Future<BlockMovementResult>> futures = moverTaskFutures
.get(Long.valueOf(trackID));
// null for the first task
if (futures == null) {
futures = new ArrayList<>();
moverTaskFutures.put(trackID, futures);
}
futures.add(futureTask);
// Notify waiting tracker thread about the newly added tasks.
moverTaskFutures.notify();
}
}
}

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@ -33,7 +33,6 @@ import java.util.EnumSet;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
@ -65,6 +64,8 @@ import org.apache.hadoop.util.Daemon;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
/**
* StoragePolicySatisfyWorker handles the storage policy satisfier commands.
* These commands would be issued from NameNode as part of Datanode's heart beat
@ -82,8 +83,10 @@ public class StoragePolicySatisfyWorker {
private final int moverThreads;
private final ExecutorService moveExecutor;
private final CompletionService<Void> moverExecutorCompletionService;
private final List<Future<Void>> moverTaskFutures;
private final CompletionService<BlockMovementResult> moverCompletionService;
private final BlocksMovementsCompletionHandler handler;
private final BlockStorageMovementTracker movementTracker;
private Daemon movementTrackerThread;
public StoragePolicySatisfyWorker(Configuration conf, DataNode datanode) {
this.datanode = datanode;
@ -92,9 +95,13 @@ public class StoragePolicySatisfyWorker {
moverThreads = conf.getInt(DFSConfigKeys.DFS_MOVER_MOVERTHREADS_KEY,
DFSConfigKeys.DFS_MOVER_MOVERTHREADS_DEFAULT);
moveExecutor = initializeBlockMoverThreadPool(moverThreads);
moverExecutorCompletionService = new ExecutorCompletionService<>(
moveExecutor);
moverTaskFutures = new ArrayList<>();
moverCompletionService = new ExecutorCompletionService<>(moveExecutor);
handler = new BlocksMovementsCompletionHandler();
movementTracker = new BlockStorageMovementTracker(moverCompletionService,
handler);
movementTrackerThread = new Daemon(movementTracker);
movementTrackerThread.setName("BlockStorageMovementTracker");
movementTrackerThread.start();
// TODO: Needs to manage the number of concurrent moves per DataNode.
}
@ -133,10 +140,6 @@ public class StoragePolicySatisfyWorker {
* separate thread. Each task will move the block replica to the target node &
* wait for the completion.
*
* TODO: Presently this function is a blocking call, this has to be refined by
* moving the tracking logic to another tracker thread. HDFS-10884 jira
* addresses the same.
*
* @param trackID
* unique tracking identifier
* @param blockPoolID
@ -146,68 +149,64 @@ public class StoragePolicySatisfyWorker {
*/
public void processBlockMovingTasks(long trackID, String blockPoolID,
Collection<BlockMovingInfo> blockMovingInfos) {
Future<Void> moveCallable = null;
for (BlockMovingInfo blkMovingInfo : blockMovingInfos) {
assert blkMovingInfo
.getSources().length == blkMovingInfo.getTargets().length;
for (int i = 0; i < blkMovingInfo.getSources().length; i++) {
BlockMovingTask blockMovingTask = new BlockMovingTask(
blkMovingInfo.getBlock(), blockPoolID,
trackID, blockPoolID, blkMovingInfo.getBlock(),
blkMovingInfo.getSources()[i], blkMovingInfo.getTargets()[i],
blkMovingInfo.getSourceStorageTypes()[i],
blkMovingInfo.getTargetStorageTypes()[i]);
moveCallable = moverExecutorCompletionService.submit(blockMovingTask);
moverTaskFutures.add(moveCallable);
}
}
for (int i = 0; i < moverTaskFutures.size(); i++) {
try {
moveCallable = moverExecutorCompletionService.take();
moveCallable.get();
} catch (InterruptedException | ExecutionException e) {
// TODO: Failure retries and report back the error to NameNode.
LOG.error("Exception while moving block replica to target storage type",
e);
Future<BlockMovementResult> moveCallable = moverCompletionService
.submit(blockMovingTask);
movementTracker.addBlock(trackID, moveCallable);
}
}
}
/**
* This class encapsulates the process of moving the block replica to the
* given target.
* given target and wait for the response.
*/
private class BlockMovingTask implements Callable<Void> {
private class BlockMovingTask implements Callable<BlockMovementResult> {
private final long trackID;
private final String blockPoolID;
private final Block block;
private final DatanodeInfo source;
private final DatanodeInfo target;
private final StorageType srcStorageType;
private final StorageType targetStorageType;
private String blockPoolID;
BlockMovingTask(Block block, String blockPoolID, DatanodeInfo source,
DatanodeInfo target, StorageType targetStorageType) {
this.block = block;
BlockMovingTask(long trackID, String blockPoolID, Block block,
DatanodeInfo source, DatanodeInfo target,
StorageType srcStorageType, StorageType targetStorageType) {
this.trackID = trackID;
this.blockPoolID = blockPoolID;
this.block = block;
this.source = source;
this.target = target;
this.srcStorageType = srcStorageType;
this.targetStorageType = targetStorageType;
}
@Override
public Void call() {
moveBlock();
return null;
public BlockMovementResult call() {
BlockMovementStatus status = moveBlock();
return new BlockMovementResult(trackID, block.getBlockId(), target,
status);
}
private void moveBlock() {
LOG.info("Start moving block {}", block);
LOG.debug("Start moving block:{} from src:{} to destin:{} to satisfy "
+ "storageType:{}", block, source, target, targetStorageType);
private BlockMovementStatus moveBlock() {
LOG.info("Start moving block:{} from src:{} to destin:{} to satisfy "
+ "storageType, sourceStoragetype:{} and destinStoragetype:{}",
block, source, target, srcStorageType, targetStorageType);
Socket sock = null;
DataOutputStream out = null;
DataInputStream in = null;
try {
ExtendedBlock extendedBlock = new ExtendedBlock(blockPoolID, block);
DNConf dnConf = datanode.getDnConf();
String dnAddr = target.getXferAddr(dnConf.getConnectToDnViaHostname());
sock = datanode.newSocket();
@ -218,7 +217,6 @@ public class StoragePolicySatisfyWorker {
OutputStream unbufOut = sock.getOutputStream();
InputStream unbufIn = sock.getInputStream();
ExtendedBlock extendedBlock = new ExtendedBlock(blockPoolID, block);
Token<BlockTokenIdentifier> accessToken = datanode.getBlockAccessToken(
extendedBlock, EnumSet.of(BlockTokenIdentifier.AccessMode.WRITE));
@ -239,12 +237,14 @@ public class StoragePolicySatisfyWorker {
"Successfully moved block:{} from src:{} to destin:{} for"
+ " satisfying storageType:{}",
block, source, target, targetStorageType);
return BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_SUCCESS;
} catch (IOException e) {
// TODO: handle failure retries
LOG.warn(
"Failed to move block:{} from src:{} to destin:{} to satisfy "
+ "storageType:{}",
block, source, target, targetStorageType, e);
return BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_FAILURE;
} finally {
IOUtils.closeStream(out);
IOUtils.closeStream(in);
@ -272,4 +272,102 @@ public class StoragePolicySatisfyWorker {
DataTransferProtoUtil.checkBlockOpStatus(response, logInfo);
}
}
/**
* Block movement status code.
*/
enum BlockMovementStatus {
/** Success. */
DN_BLK_STORAGE_MOVEMENT_SUCCESS(0),
/**
* Failure due to generation time stamp mismatches or network errors
* or no available space.
*/
DN_BLK_STORAGE_MOVEMENT_FAILURE(-1);
// TODO: need to support different type of failures. Failure due to network
// errors, block pinned, no space available etc.
private final int code;
private BlockMovementStatus(int code) {
this.code = code;
}
/**
* @return the status code.
*/
int getStatusCode() {
return code;
}
}
/**
* This class represents result from a block movement task. This will have the
* information of the task which was successful or failed due to errors.
*/
static class BlockMovementResult {
private final long trackId;
private final long blockId;
private final DatanodeInfo target;
private final BlockMovementStatus status;
public BlockMovementResult(long trackId, long blockId,
DatanodeInfo target, BlockMovementStatus status) {
this.trackId = trackId;
this.blockId = blockId;
this.target = target;
this.status = status;
}
long getTrackId() {
return trackId;
}
long getBlockId() {
return blockId;
}
BlockMovementStatus getStatus() {
return status;
}
@Override
public String toString() {
return new StringBuilder().append("Block movement result(\n ")
.append("track id: ").append(trackId).append(" block id: ")
.append(blockId).append(" target node: ").append(target)
.append(" movement status: ").append(status).append(")").toString();
}
}
/**
* Blocks movements completion handler, which is used to collect details of
* the completed list of block movements and notify the namenode about the
* success or failures.
*/
static class BlocksMovementsCompletionHandler {
private final List<BlockMovementResult> completedBlocks = new ArrayList<>();
/**
* Collect all the block movement results and notify namenode.
*
* @param results
* result of all the block movements per trackId
*/
void handle(List<BlockMovementResult> results) {
completedBlocks.addAll(results);
// TODO: notify namenode about the success/failures.
}
@VisibleForTesting
List<BlockMovementResult> getCompletedBlocks() {
return completedBlocks;
}
}
@VisibleForTesting
BlocksMovementsCompletionHandler getBlocksMovementsCompletionHandler() {
return handler;
}
}

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@ -35,10 +35,10 @@ import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
* service. After the block movement this DataNode sends response back to the
* NameNode about the movement status.
*
* The coordinator datanode will use 'trackId' identifier to coordinate the block
* movement of the given set of blocks. TrackId is a unique identifier that
* represents a group of blocks. Namenode will generate this unique value and
* send it to the coordinator datanode along with the
* The coordinator datanode will use 'trackId' identifier to coordinate the
* block movement of the given set of blocks. TrackId is a unique identifier
* that represents a group of blocks. Namenode will generate this unique value
* and send it to the coordinator datanode along with the
* BlockStorageMovementCommand. Datanode will monitor the completion of the
* block movements that grouped under this trackId and notifies Namenode about
* the completion status.
@ -153,11 +153,11 @@ public class BlockStorageMovementCommand extends DatanodeCommand {
return new StringBuilder().append("BlockMovingInfo(\n ")
.append("Moving block: ").append(blk).append(" From: ")
.append(Arrays.asList(sourceNodes)).append(" To: [")
.append(Arrays.asList(targetNodes)).append(")\n")
.append(Arrays.asList(targetNodes)).append("\n ")
.append(" sourceStorageTypes: ")
.append(Arrays.toString(sourceStorageTypes))
.append(" targetStorageTypes: ")
.append(Arrays.toString(targetStorageTypes)).toString();
.append(Arrays.toString(targetStorageTypes)).append(")").toString();
}
}
}

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@ -18,6 +18,7 @@
package org.apache.hadoop.hdfs.server.datanode;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
@ -33,10 +34,15 @@ import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlockMovementResult;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlockMovementStatus;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.protocol.BlockStorageMovementCommand.BlockMovingInfo;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -51,8 +57,9 @@ public class TestStoragePolicySatisfyWorker {
private static final Logger LOG = LoggerFactory
.getLogger(TestStoragePolicySatisfyWorker.class);
private static final int DEFAULT_BLOCK_SIZE = 100;
private MiniDFSCluster cluster = null;
private final Configuration conf = new HdfsConfiguration();
private static void initConf(Configuration conf) {
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, DEFAULT_BLOCK_SIZE);
@ -63,23 +70,31 @@ public class TestStoragePolicySatisfyWorker {
conf.setLong(DFSConfigKeys.DFS_BALANCER_MOVEDWINWIDTH_KEY, 2000L);
}
@Before
public void setUp() throws IOException {
initConf(conf);
}
@After
public void teardown() throws IOException {
if (cluster != null) {
cluster.shutdown();
}
}
/**
* Tests to verify that the block replica is moving to ARCHIVE storage type to
* fulfill the storage policy requirement.
*/
@Test(timeout = 120000)
public void testMoveSingleBlockToAnotherDatanode() throws Exception {
final Configuration conf = new HdfsConfiguration();
initConf(conf);
final MiniDFSCluster cluster =
new MiniDFSCluster.Builder(conf).numDataNodes(4)
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(4)
.storageTypes(
new StorageType[][] {{StorageType.DISK, StorageType.ARCHIVE},
{StorageType.DISK, StorageType.ARCHIVE},
{StorageType.ARCHIVE, StorageType.ARCHIVE},
{StorageType.ARCHIVE, StorageType.ARCHIVE}})
.build();
try {
cluster.waitActive();
final DistributedFileSystem dfs = cluster.getFileSystem();
final String file = "/testMoveSingleBlockToAnotherDatanode";
@ -97,13 +112,65 @@ public class TestStoragePolicySatisfyWorker {
// move to ARCHIVE
dfs.setStoragePolicy(new Path(file), "COLD");
FSNamesystem namesystem = cluster.getNamesystem();
INode inode = namesystem.getFSDirectory().getINode(file);
namesystem.getBlockManager().satisfyStoragePolicy(inode.getId());
cluster.triggerHeartbeats();
// Wait till NameNode notified about the block location details
waitForLocatedBlockWithArchiveStorageType(dfs, file, 2, 30000);
}
/**
* Test to verify that satisfy worker can't move blocks. If specified target
* datanode doesn't have enough space to accommodate the moving block.
*/
@Test(timeout = 120000)
public void testMoveWithNoSpaceAvailable() throws Exception {
final long capacity = 150;
final String rack0 = "/rack0";
final String rack1 = "/rack1";
long[] capacities = new long[] {capacity, capacity, capacity / 2};
String[] hosts = {"host0", "host1", "host2"};
String[] racks = {rack0, rack1, rack0};
int numOfDatanodes = capacities.length;
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numOfDatanodes)
.hosts(hosts).racks(racks).simulatedCapacities(capacities)
.storageTypes(
new StorageType[][] {{StorageType.DISK, StorageType.ARCHIVE},
{StorageType.DISK, StorageType.ARCHIVE},
{StorageType.ARCHIVE, StorageType.ARCHIVE}})
.build();
cluster.waitActive();
InetSocketAddress[] favoredNodes = new InetSocketAddress[3];
for (int i = 0; i < favoredNodes.length; i++) {
// DFSClient will attempt reverse lookup. In case it resolves
// "127.0.0.1" to "localhost", we manually specify the hostname.
favoredNodes[i] = cluster.getDataNodes().get(i).getXferAddress();
}
final DistributedFileSystem dfs = cluster.getFileSystem();
final String file = "/testMoveWithNoSpaceAvailable";
DFSTestUtil.createFile(dfs, new Path(file), false, 1024, 100,
DEFAULT_BLOCK_SIZE, (short) 2, 0, false, favoredNodes);
// verify before movement
LocatedBlock lb = dfs.getClient().getLocatedBlocks(file, 0).get(0);
StorageType[] storageTypes = lb.getStorageTypes();
for (StorageType storageType : storageTypes) {
Assert.assertTrue(StorageType.DISK == storageType);
}
// move to ARCHIVE
dfs.setStoragePolicy(new Path(file), "COLD");
lb = dfs.getClient().getLocatedBlocks(file, 0).get(0);
DataNode src = cluster.getDataNodes().get(3);
DataNode src = cluster.getDataNodes().get(2);
DatanodeInfo targetDnInfo = DFSTestUtil
.getLocalDatanodeInfo(src.getXferPort());
// TODO: Need to revisit this when NN is implemented to be able to send
// block moving commands.
StoragePolicySatisfyWorker worker = new StoragePolicySatisfyWorker(conf,
src);
List<BlockMovingInfo> blockMovingInfos = new ArrayList<>();
@ -114,13 +181,30 @@ public class TestStoragePolicySatisfyWorker {
INode inode = cluster.getNamesystem().getFSDirectory().getINode(file);
worker.processBlockMovingTasks(inode.getId(),
cluster.getNamesystem().getBlockPoolId(), blockMovingInfos);
cluster.triggerHeartbeats();
// Wait till NameNode notified about the block location details
waitForLocatedBlockWithArchiveStorageType(dfs, file, 1, 30000);
} finally {
cluster.shutdown();
waitForBlockMovementCompletion(worker, inode.getId(), 1, 30000);
}
private void waitForBlockMovementCompletion(
final StoragePolicySatisfyWorker worker, final long inodeId,
int expectedFailedItemsCount, int timeout) throws Exception {
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
List<BlockMovementResult> completedBlocks = worker
.getBlocksMovementsCompletionHandler().getCompletedBlocks();
int failedCount = 0;
for (BlockMovementResult blockMovementResult : completedBlocks) {
if (BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_FAILURE ==
blockMovementResult.getStatus()) {
failedCount++;
}
}
LOG.info("Block movement completed count={}, expected={} and actual={}",
completedBlocks.size(), expectedFailedItemsCount, failedCount);
return expectedFailedItemsCount == failedCount;
}
}, 100, timeout);
}
private void waitForLocatedBlockWithArchiveStorageType(
@ -150,7 +234,7 @@ public class TestStoragePolicySatisfyWorker {
}, 100, timeout);
}
BlockMovingInfo prepareBlockMovingInfo(Block block,
private BlockMovingInfo prepareBlockMovingInfo(Block block,
DatanodeInfo src, DatanodeInfo destin, StorageType storageType,
StorageType targetStorageType) {
return new BlockMovingInfo(block, new DatanodeInfo[] {src},