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HDFS-11151. [SPS]: StoragePolicySatisfier should gracefully handle when there is no target node with the required storage type. Contributed by Rakesh R

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This commit is contained in:
Rakesh Radhakrishnan 2016-11-27 11:15:26 +05:30 committed by Uma Maheswara Rao Gangumalla
parent b67ae6d9d7
commit b07291e176
6 changed files with 186 additions and 31 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -4999,7 +4999,7 @@ public ProvidedStorageMap getProvidedStorageMap() {
*/
public void satisfyStoragePolicy(long id) {
storageMovementNeeded.add(id);
if(LOG.isDebugEnabled()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Added block collection id {} to block "
+ "storageMovementNeeded queue", id);
}

30
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockStorageMovementTracker.java
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@ -27,8 +27,9 @@
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.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlockMovementStatus;
import org.apache.hadoop.hdfs.server.datanode.StoragePolicySatisfyWorker.BlocksMovementsCompletionHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -108,15 +109,32 @@ public void run() {
}
}
/**
* Mark as block movement failure for the given trackId and blockId.
*
* @param trackId tracking id
* @param blockId block id
*/
void markBlockMovementFailure(long trackId, long blockId) {
LOG.debug("Mark as block movement failure for the given "
+ "trackId:{} and blockId:{}", trackId, blockId);
BlockMovementResult result = new BlockMovementResult(trackId, blockId, null,
BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_FAILURE);
addMovementResultToTrackIdList(result);
}
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);
List<BlockMovementResult> perTrackIdList;
synchronized (movementResults) {
perTrackIdList = movementResults.get(trackId);
if (perTrackIdList == null) {
perTrackIdList = new ArrayList<>();
movementResults.put(trackId, perTrackIdList);
}
perTrackIdList.add(result);
}
perTrackIdList.add(result);
return perTrackIdList;
}

20
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/StoragePolicySatisfyWorker.java
View File

@ -151,14 +151,24 @@ public void rejectedExecution(Runnable runnable,
*/
public void processBlockMovingTasks(long trackID, String blockPoolID,
Collection<BlockMovingInfo> blockMovingInfos) {
LOG.debug("Received BlockMovingTasks {}", blockMovingInfos);
for (BlockMovingInfo blkMovingInfo : blockMovingInfos) {
assert blkMovingInfo
.getSources().length == blkMovingInfo.getTargets().length;
for (int i = 0; i < blkMovingInfo.getSources().length; i++) {
// Iterating backwards. This is to ensure that all the block src location
// which doesn't have a target node will be marked as failure before
// scheduling the block movement to valid target nodes.
for (int i = blkMovingInfo.getSources().length - 1; i >= 0; i--) {
if (i >= blkMovingInfo.getTargets().length) {
// Since there is no target selected for scheduling the block,
// just mark this block storage movement as failure. Later, namenode
// can take action on this.
movementTracker.markBlockMovementFailure(trackID,
blkMovingInfo.getBlock().getBlockId());
continue;
}
DatanodeInfo target = blkMovingInfo.getTargets()[i];
BlockMovingTask blockMovingTask = new BlockMovingTask(
trackID, blockPoolID, blkMovingInfo.getBlock(),
blkMovingInfo.getSources()[i], blkMovingInfo.getTargets()[i],
blkMovingInfo.getSources()[i], target,
blkMovingInfo.getSourceStorageTypes()[i],
blkMovingInfo.getTargetStorageTypes()[i]);
Future<BlockMovementResult> moveCallable = moverCompletionService

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BlockStorageMovementAttemptedItems.java
View File

@ -218,4 +218,8 @@ public int resultsCount() {
return storageMovementAttemptedResults.size();
}
@VisibleForTesting
public int getAttemptedItemsCount() {
return storageMovementAttemptedItems.size();
}
}

53
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/StoragePolicySatisfier.java
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@ -211,6 +211,14 @@ private void computeAndAssignStorageMismatchedBlocksToDNs(
}
}
addBlockMovingInfosToCoordinatorDn(blockCollectionID, blockMovingInfos,
coordinatorNode);
}
private void addBlockMovingInfosToCoordinatorDn(long blockCollectionID,
List<BlockMovingInfo> blockMovingInfos,
DatanodeDescriptor coordinatorNode) {
if (blockMovingInfos.size() < 1) {
// TODO: Major: handle this case. I think we need retry cases to
// be implemented. Idea is, if some files are not getting storage movement
@ -218,6 +226,20 @@ private void computeAndAssignStorageMismatchedBlocksToDNs(
return;
}
boolean needBlockStorageMovement = false;
for (BlockMovingInfo blkMovingInfo : blockMovingInfos) {
// Check for atleast one block storage movement has been chosen
if (blkMovingInfo.getTargets().length > 0){
needBlockStorageMovement = true;
break;
}
}
if (!needBlockStorageMovement) {
// Simply return as there is no targets selected for scheduling the block
// movement.
return;
}
// 'BlockCollectionId' is used as the tracking ID. All the blocks under this
// blockCollectionID will be added to this datanode.
coordinatorNode.addBlocksToMoveStorage(blockCollectionID, blockMovingInfos);
@ -251,9 +273,8 @@ private BlockMovingInfo findSourceAndTargetToMove(BlockInfo blockInfo,
List<DatanodeDescriptor> chosenNodes = new ArrayList<>();
for (int i = 0; i < sourceWithStorageList.size(); i++) {
StorageTypeNodePair existingTypeNodePair = sourceWithStorageList.get(i);
StorageTypeNodePair chosenTarget =
chooseTargetTypeInSameNode(existingTypeNodePair.dn, expected,
locsForExpectedStorageTypes, chosenNodes);
StorageTypeNodePair chosenTarget = chooseTargetTypeInSameNode(
existingTypeNodePair.dn, expected);
if (chosenTarget == null && blockManager.getDatanodeManager()
.getNetworkTopology().isNodeGroupAware()) {
@ -282,15 +303,14 @@ private BlockMovingInfo findSourceAndTargetToMove(BlockInfo blockInfo,
chosenNodes.add(chosenTarget.dn);
// TODO: We can increment scheduled block count for this node?
} else {
// TODO: Failed to ChooseTargetNodes...So let just retry. Shall we
// proceed without this targets? Then what should be final result?
// How about pack empty target, means target node could not be chosen ,
// so result should be RETRY_REQUIRED from DN always.
// Log..unable to choose target node for source datanodeDescriptor
LOG.warn(
"Failed to choose target datanode for the required"
+ " storage types {}, block:{}, existing storage type:{}",
expected, blockInfo, existingTypeNodePair.storageType);
sourceNodes.add(existingTypeNodePair.dn);
sourceStorageTypes.add(existingTypeNodePair.storageType);
targetNodes.add(null);
targetStorageTypes.add(null);
// Imp: Not setting the target details, empty targets. Later, this is
// used as an indicator for retrying this block movement.
}
}
BlockMovingInfo blkMovingInfo = new BlockMovingInfo(blockInfo,
@ -302,15 +322,13 @@ private BlockMovingInfo findSourceAndTargetToMove(BlockInfo blockInfo,
}
/**
* Choose the target storage within same Datanode if possible.
* Choose the target storage within same datanode if possible.
*
* @param locsForExpectedStorageTypes
* @param chosenNodes
* @param source source datanode
* @param targetTypes list of target storage types
*/
private StorageTypeNodePair chooseTargetTypeInSameNode(
DatanodeDescriptor source, List<StorageType> targetTypes,
StorageTypeNodeMap locsForExpectedStorageTypes,
List<DatanodeDescriptor> chosenNodes) {
DatanodeDescriptor source, List<StorageType> targetTypes) {
for (StorageType t : targetTypes) {
DatanodeStorageInfo chooseStorage4Block =
source.chooseStorage4Block(t, 0);
@ -328,6 +346,9 @@ private StorageTypeNodePair chooseTarget(Block block,
for (StorageType t : targetTypes) {
List<DatanodeDescriptor> nodesWithStorages =
locsForExpectedStorageTypes.getNodesWithStorages(t);
if (nodesWithStorages == null || nodesWithStorages.isEmpty()) {
continue; // no target nodes with the required storage type.
}
Collections.shuffle(nodesWithStorages);
for (DatanodeDescriptor target : nodesWithStorages) {
if (!chosenNodes.contains(target) && matcher.match(

108
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestStoragePolicySatisfier.java
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@ -17,6 +17,8 @@
*/
package org.apache.hadoop.hdfs.server.namenode;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_STORAGE_POLICY_ENABLED_KEY;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
@ -44,8 +46,6 @@
import com.google.common.base.Supplier;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_STORAGE_POLICY_ENABLED_KEY;
/**
* Tests that StoragePolicySatisfier daemon is able to check the blocks to be
* moved and finding its suggested target locations to move.
@ -79,7 +79,7 @@ public void testWhenStoragePolicySetToCOLD()
throws Exception {
try {
// Change policy to ALL_SSD
// Change policy to COLD
dfs.setStoragePolicy(new Path(file), "COLD");
FSNamesystem namesystem = hdfsCluster.getNamesystem();
INode inode = namesystem.getFSDirectory().getINode(file);
@ -356,6 +356,108 @@ public void testSatisfyWithExceptions() throws Exception {
}
}
/**
* Tests to verify that for the given path, some of the blocks or block src
* locations(src nodes) under the given path will be scheduled for block
* movement.
*
* For example, there are two block for a file:
*
* File1 => blk_1[locations=A(DISK),B(DISK),C(DISK)],
* blk_2[locations=A(DISK),B(DISK),C(DISK)]. Now, set storage policy to COLD.
* Only one datanode is available with storage type ARCHIVE, say D.
*
* SPS will schedule block movement to the coordinator node with the details,
* blk_1[move A(DISK) -> D(ARCHIVE)], blk_2[move A(DISK) -> D(ARCHIVE)].
*/
@Test(timeout = 300000)
public void testWhenOnlyFewTargetDatanodeAreAvailableToSatisfyStoragePolicy()
throws Exception {
try {
// Change policy to COLD
dfs.setStoragePolicy(new Path(file), "COLD");
FSNamesystem namesystem = hdfsCluster.getNamesystem();
INode inode = namesystem.getFSDirectory().getINode(file);
StorageType[][] newtypes =
new StorageType[][]{{StorageType.ARCHIVE, StorageType.ARCHIVE}};
// Adding ARCHIVE based datanodes.
startAdditionalDNs(config, 1, numOfDatanodes, newtypes,
storagesPerDatanode, capacity, hdfsCluster);
namesystem.getBlockManager().satisfyStoragePolicy(inode.getId());
hdfsCluster.triggerHeartbeats();
// Wait till StorgePolicySatisfier identified that block to move to
// ARCHIVE area.
waitExpectedStorageType(file, StorageType.ARCHIVE, 1, 30000);
waitExpectedStorageType(file, StorageType.DISK, 2, 30000);
waitForBlocksMovementResult(1, 30000);
} finally {
hdfsCluster.shutdown();
}
}
/**
* Tests to verify that for the given path, no blocks or block src
* locations(src nodes) under the given path will be scheduled for block
* movement as there are no available datanode with required storage type.
*
* For example, there are two block for a file:
*
* File1 => blk_1[locations=A(DISK),B(DISK),C(DISK)],
* blk_2[locations=A(DISK),B(DISK),C(DISK)]. Now, set storage policy to COLD.
* No datanode is available with storage type ARCHIVE.
*
* SPS won't schedule any block movement for this path.
*/
@Test(timeout = 300000)
public void testWhenNoTargetDatanodeToSatisfyStoragePolicy()
throws Exception {
try {
// Change policy to COLD
dfs.setStoragePolicy(new Path(file), "COLD");
FSNamesystem namesystem = hdfsCluster.getNamesystem();
INode inode = namesystem.getFSDirectory().getINode(file);
StorageType[][] newtypes =
new StorageType[][]{{StorageType.DISK, StorageType.DISK}};
// Adding DISK based datanodes
startAdditionalDNs(config, 1, numOfDatanodes, newtypes,
storagesPerDatanode, capacity, hdfsCluster);
namesystem.getBlockManager().satisfyStoragePolicy(inode.getId());
hdfsCluster.triggerHeartbeats();
// No block movement will be scheduled as there is no target node available
// with the required storage type.
waitForAttemptedItems(1, 30000);
waitExpectedStorageType(file, StorageType.DISK, 3, 30000);
// Since there is no target node the item will get timed out and then
// re-attempted.
waitForAttemptedItems(1, 30000);
} finally {
hdfsCluster.shutdown();
}
}
private void waitForAttemptedItems(long expectedBlkMovAttemptedCount,
int timeout) throws TimeoutException, InterruptedException {
BlockManager blockManager = hdfsCluster.getNamesystem().getBlockManager();
final StoragePolicySatisfier sps = blockManager.getStoragePolicySatisfier();
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
LOG.info("expectedAttemptedItemsCount={} actualAttemptedItemsCount={}",
expectedBlkMovAttemptedCount,
sps.getAttemptedItemsMonitor().getAttemptedItemsCount());
return sps.getAttemptedItemsMonitor()
.getAttemptedItemsCount() == expectedBlkMovAttemptedCount;
}
}, 100, timeout);
}
private void waitForBlocksMovementResult(long expectedBlkMovResultsCount,
int timeout) throws TimeoutException, InterruptedException {
BlockManager blockManager = hdfsCluster.getNamesystem().getBlockManager();