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apache / hadoop / a32ae95b0959b6536690e0510daf7ac10b230b35 / . / hadoop-hdfs-project / hadoop-hdfs / src / main / java / org / apache / hadoop / hdfs / server / blockmanagement / BlockManager.java
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/**
* 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.blockmanagement;
import static org.apache.hadoop.util.ExitUtil.terminate;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicLong;
import javax.management.ObjectName;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.AddBlockFlag;
import org.apache.hadoop.fs.FileEncryptionInfo;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.HAUtil;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs.BlockReportReplica;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.hdfs.protocol.UnregisteredNodeException;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier.AccessMode;
import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.blockmanagement.CorruptReplicasMap.Reason;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo.AddBlockResult;
import org.apache.hadoop.hdfs.server.blockmanagement.PendingDataNodeMessages.ReportedBlockInfo;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
import org.apache.hadoop.hdfs.server.namenode.CachedBlock;
import org.apache.hadoop.hdfs.server.namenode.INodesInPath;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
import org.apache.hadoop.hdfs.server.namenode.Namesystem;
import org.apache.hadoop.hdfs.server.namenode.ha.HAContext;
import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
import org.apache.hadoop.hdfs.server.protocol.BlockReportContext;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations.BlockWithLocations;
import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage.State;
import org.apache.hadoop.hdfs.server.protocol.KeyUpdateCommand;
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
import org.apache.hadoop.hdfs.server.protocol.StorageReceivedDeletedBlocks;
import org.apache.hadoop.hdfs.util.LightWeightHashSet;
import org.apache.hadoop.hdfs.server.namenode.CacheManager;
import org.apache.hadoop.metrics2.util.MBeans;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Daemon;
import org.apache.hadoop.util.ExitUtil;
import org.apache.hadoop.util.LightWeightGSet;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Time;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Keeps information related to the blocks stored in the Hadoop cluster.
*/
@InterfaceAudience.Private
public class BlockManager implements BlockStatsMXBean {
public static final Logger LOG = LoggerFactory.getLogger(BlockManager.class);
public static final Logger blockLog = NameNode.blockStateChangeLog;
private static final String QUEUE_REASON_CORRUPT_STATE =
"it has the wrong state or generation stamp";
private static final String QUEUE_REASON_FUTURE_GENSTAMP =
"generation stamp is in the future";
private final Namesystem namesystem;
private final DatanodeManager datanodeManager;
private final HeartbeatManager heartbeatManager;
private final BlockTokenSecretManager blockTokenSecretManager;
private final PendingDataNodeMessages pendingDNMessages =
new PendingDataNodeMessages();
private volatile long pendingReplicationBlocksCount = 0L;
private volatile long corruptReplicaBlocksCount = 0L;
private volatile long underReplicatedBlocksCount = 0L;
private volatile long scheduledReplicationBlocksCount = 0L;
/** flag indicating whether replication queues have been initialized */
private boolean initializedReplQueues;
private final AtomicLong excessBlocksCount = new AtomicLong(0L);
private final long startupDelayBlockDeletionInMs;
private final BlockReportLeaseManager blockReportLeaseManager;
private ObjectName mxBeanName;
/** Used by metrics */
public long getPendingReplicationBlocksCount() {
return pendingReplicationBlocksCount;
}
/** Used by metrics */
public long getUnderReplicatedBlocksCount() {
return underReplicatedBlocksCount;
}
/** Used by metrics */
public long getCorruptReplicaBlocksCount() {
return corruptReplicaBlocksCount;
}
/** Used by metrics */
public long getScheduledReplicationBlocksCount() {
return scheduledReplicationBlocksCount;
}
/** Used by metrics */
public long getPendingDeletionBlocksCount() {
return invalidateBlocks.numBlocks();
}
/** Used by metrics */
public long getStartupDelayBlockDeletionInMs() {
return startupDelayBlockDeletionInMs;
}
/** Used by metrics */
public long getExcessBlocksCount() {
return excessBlocksCount.get();
}
/** Used by metrics */
public long getPostponedMisreplicatedBlocksCount() {
return postponedMisreplicatedBlocks.size();
}
/** Used by metrics */
public int getPendingDataNodeMessageCount() {
return pendingDNMessages.count();
}
/** Used by metrics. */
public long getNumTimedOutPendingReplications() {
return pendingReplications.getNumTimedOuts();
}
/**replicationRecheckInterval is how often namenode checks for new replication work*/
private final long replicationRecheckInterval;
/**
* Mapping: Block -> { BlockCollection, datanodes, self ref }
* Updated only in response to client-sent information.
*/
final BlocksMap blocksMap;
/** Replication thread. */
final Daemon replicationThread = new Daemon(new ReplicationMonitor());
/** Block report thread for handling async reports. */
private final BlockReportProcessingThread blockReportThread =
new BlockReportProcessingThread();
/** Store blocks -> datanodedescriptor(s) map of corrupt replicas */
final CorruptReplicasMap corruptReplicas = new CorruptReplicasMap();
/** Blocks to be invalidated. */
private final InvalidateBlocks invalidateBlocks;
/**
* After a failover, over-replicated blocks may not be handled
* until all of the replicas have done a block report to the
* new active. This is to make sure that this NameNode has been
* notified of all block deletions that might have been pending
* when the failover happened.
*/
private final LinkedHashSet<Block> postponedMisreplicatedBlocks =
new LinkedHashSet<Block>();
private final int blocksPerPostpondedRescan;
private final ArrayList<Block> rescannedMisreplicatedBlocks;
/**
* Maps a StorageID to the set of blocks that are "extra" for this
* DataNode. We'll eventually remove these extras.
*/
public final Map<String, LightWeightHashSet<Block>> excessReplicateMap =
new HashMap<>();
/**
* Store set of Blocks that need to be replicated 1 or more times.
* We also store pending replication-orders.
*/
public final UnderReplicatedBlocks neededReplications = new UnderReplicatedBlocks();
@VisibleForTesting
final PendingReplicationBlocks pendingReplications;
/** The maximum number of replicas allowed for a block */
public final short maxReplication;
/**
* The maximum number of outgoing replication streams a given node should have
* at one time considering all but the highest priority replications needed.
*/
int maxReplicationStreams;
/**
* The maximum number of outgoing replication streams a given node should have
* at one time.
*/
int replicationStreamsHardLimit;
/** Minimum copies needed or else write is disallowed */
public final short minReplication;
/** Default number of replicas */
public final int defaultReplication;
/** value returned by MAX_CORRUPT_FILES_RETURNED */
final int maxCorruptFilesReturned;
final float blocksInvalidateWorkPct;
final int blocksReplWorkMultiplier;
// whether or not to issue block encryption keys.
final boolean encryptDataTransfer;
// Max number of blocks to log info about during a block report.
private final long maxNumBlocksToLog;
/**
* When running inside a Standby node, the node may receive block reports
* from datanodes before receiving the corresponding namespace edits from
* the active NameNode. Thus, it will postpone them for later processing,
* instead of marking the blocks as corrupt.
*/
private boolean shouldPostponeBlocksFromFuture = false;
/**
* Process replication queues asynchronously to allow namenode safemode exit
* and failover to be faster. HDFS-5496
*/
private Daemon replicationQueuesInitializer = null;
/**
* Number of blocks to process asychronously for replication queues
* initialization once aquired the namesystem lock. Remaining blocks will be
* processed again after aquiring lock again.
*/
private int numBlocksPerIteration;
/**
* Minimum size that a block can be sent to Balancer through getBlocks.
* And after HDFS-8824, the small blocks are unused anyway, so there's no
* point to send them to balancer.
*/
private long getBlocksMinBlockSize = -1;
/**
* Progress of the Replication queues initialisation.
*/
private double replicationQueuesInitProgress = 0.0;
/** for block replicas placement */
private BlockPlacementPolicy blockplacement;
private final BlockStoragePolicySuite storagePolicySuite;
/** Check whether name system is running before terminating */
private boolean checkNSRunning = true;
/** Keeps track of how many bytes are in Future Generation blocks. */
private AtomicLong numberOfBytesInFutureBlocks;
/** Reports if Name node was started with Rollback option. */
private boolean inRollBack = false;
public BlockManager(final Namesystem namesystem, final Configuration conf)
throws IOException {
this.namesystem = namesystem;
datanodeManager = new DatanodeManager(this, namesystem, conf);
heartbeatManager = datanodeManager.getHeartbeatManager();
blocksPerPostpondedRescan = (int)Math.min(Integer.MAX_VALUE,
datanodeManager.getBlocksPerPostponedMisreplicatedBlocksRescan());
rescannedMisreplicatedBlocks =
new ArrayList<Block>(blocksPerPostpondedRescan);
startupDelayBlockDeletionInMs = conf.getLong(
DFSConfigKeys.DFS_NAMENODE_STARTUP_DELAY_BLOCK_DELETION_SEC_KEY,
DFSConfigKeys.DFS_NAMENODE_STARTUP_DELAY_BLOCK_DELETION_SEC_DEFAULT) * 1000L;
invalidateBlocks = new InvalidateBlocks(
datanodeManager.blockInvalidateLimit, startupDelayBlockDeletionInMs);
// Compute the map capacity by allocating 2% of total memory
blocksMap = new BlocksMap(
LightWeightGSet.computeCapacity(2.0, "BlocksMap"));
blockplacement = BlockPlacementPolicy.getInstance(
conf, datanodeManager.getFSClusterStats(),
datanodeManager.getNetworkTopology(),
datanodeManager.getHost2DatanodeMap());
storagePolicySuite = BlockStoragePolicySuite.createDefaultSuite();
pendingReplications = new PendingReplicationBlocks(conf.getInt(
DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_DEFAULT) * 1000L);
blockTokenSecretManager = createBlockTokenSecretManager(conf);
this.maxCorruptFilesReturned = conf.getInt(
DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED_KEY,
DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED);
this.defaultReplication = conf.getInt(DFSConfigKeys.DFS_REPLICATION_KEY,
DFSConfigKeys.DFS_REPLICATION_DEFAULT);
final int maxR = conf.getInt(DFSConfigKeys.DFS_REPLICATION_MAX_KEY,
DFSConfigKeys.DFS_REPLICATION_MAX_DEFAULT);
final int minR = conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_DEFAULT);
if (minR <= 0)
throw new IOException("Unexpected configuration parameters: "
+ DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
+ " = " + minR + " <= 0");
if (maxR > Short.MAX_VALUE)
throw new IOException("Unexpected configuration parameters: "
+ DFSConfigKeys.DFS_REPLICATION_MAX_KEY
+ " = " + maxR + " > " + Short.MAX_VALUE);
if (minR > maxR)
throw new IOException("Unexpected configuration parameters: "
+ DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
+ " = " + minR + " > "
+ DFSConfigKeys.DFS_REPLICATION_MAX_KEY
+ " = " + maxR);
this.minReplication = (short)minR;
this.maxReplication = (short)maxR;
this.maxReplicationStreams =
conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_DEFAULT);
this.replicationStreamsHardLimit =
conf.getInt(
DFSConfigKeys.DFS_NAMENODE_REPLICATION_STREAMS_HARD_LIMIT_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_STREAMS_HARD_LIMIT_DEFAULT);
this.blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf);
this.blocksReplWorkMultiplier = DFSUtil.getReplWorkMultiplier(conf);
this.replicationRecheckInterval =
conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY,
DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_DEFAULT) * 1000L;
this.encryptDataTransfer =
conf.getBoolean(DFSConfigKeys.DFS_ENCRYPT_DATA_TRANSFER_KEY,
DFSConfigKeys.DFS_ENCRYPT_DATA_TRANSFER_DEFAULT);
this.maxNumBlocksToLog =
conf.getLong(DFSConfigKeys.DFS_MAX_NUM_BLOCKS_TO_LOG_KEY,
DFSConfigKeys.DFS_MAX_NUM_BLOCKS_TO_LOG_DEFAULT);
this.numBlocksPerIteration = conf.getInt(
DFSConfigKeys.DFS_BLOCK_MISREPLICATION_PROCESSING_LIMIT,
DFSConfigKeys.DFS_BLOCK_MISREPLICATION_PROCESSING_LIMIT_DEFAULT);
this.getBlocksMinBlockSize = conf.getLongBytes(
DFSConfigKeys.DFS_BALANCER_GETBLOCKS_MIN_BLOCK_SIZE_KEY,
DFSConfigKeys.DFS_BALANCER_GETBLOCKS_MIN_BLOCK_SIZE_DEFAULT);
this.blockReportLeaseManager = new BlockReportLeaseManager(conf);
this.numberOfBytesInFutureBlocks = new AtomicLong();
this.inRollBack = isInRollBackMode(NameNode.getStartupOption(conf));
LOG.info("defaultReplication = " + defaultReplication);
LOG.info("maxReplication = " + maxReplication);
LOG.info("minReplication = " + minReplication);
LOG.info("maxReplicationStreams = " + maxReplicationStreams);
LOG.info("replicationRecheckInterval = " + replicationRecheckInterval);
LOG.info("encryptDataTransfer = " + encryptDataTransfer);
LOG.info("maxNumBlocksToLog = " + maxNumBlocksToLog);
}
private static BlockTokenSecretManager createBlockTokenSecretManager(
final Configuration conf) throws IOException {
final boolean isEnabled = conf.getBoolean(
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY,
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_DEFAULT);
LOG.info(DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY + "=" + isEnabled);
if (!isEnabled) {
if (UserGroupInformation.isSecurityEnabled()) {
String errMessage = "Security is enabled but block access tokens " +
"(via " + DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY + ") " +
"aren't enabled. This may cause issues " +
"when clients attempt to connect to a DataNode. Aborting NameNode";
throw new IOException(errMessage);
}
return null;
}
final long updateMin = conf.getLong(
DFSConfigKeys.DFS_BLOCK_ACCESS_KEY_UPDATE_INTERVAL_KEY,
DFSConfigKeys.DFS_BLOCK_ACCESS_KEY_UPDATE_INTERVAL_DEFAULT);
final long lifetimeMin = conf.getLong(
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_LIFETIME_KEY,
DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_LIFETIME_DEFAULT);
final String encryptionAlgorithm = conf.get(
DFSConfigKeys.DFS_DATA_ENCRYPTION_ALGORITHM_KEY);
LOG.info(DFSConfigKeys.DFS_BLOCK_ACCESS_KEY_UPDATE_INTERVAL_KEY
+ "=" + updateMin + " min(s), "
+ DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_LIFETIME_KEY
+ "=" + lifetimeMin + " min(s), "
+ DFSConfigKeys.DFS_DATA_ENCRYPTION_ALGORITHM_KEY
+ "=" + encryptionAlgorithm);
String nsId = DFSUtil.getNamenodeNameServiceId(conf);
boolean isHaEnabled = HAUtil.isHAEnabled(conf, nsId);
if (isHaEnabled) {
String thisNnId = HAUtil.getNameNodeId(conf, nsId);
String otherNnId = HAUtil.getNameNodeIdOfOtherNode(conf, nsId);
return new BlockTokenSecretManager(updateMin*60*1000L,
lifetimeMin*60*1000L, thisNnId.compareTo(otherNnId) < 0 ? 0 : 1, null,
encryptionAlgorithm);
} else {
return new BlockTokenSecretManager(updateMin*60*1000L,
lifetimeMin*60*1000L, 0, null, encryptionAlgorithm);
}
}
public BlockStoragePolicy getStoragePolicy(final String policyName) {
return storagePolicySuite.getPolicy(policyName);
}
public BlockStoragePolicy getStoragePolicy(final byte policyId) {
return storagePolicySuite.getPolicy(policyId);
}
public BlockStoragePolicy[] getStoragePolicies() {
return storagePolicySuite.getAllPolicies();
}
public void setBlockPoolId(String blockPoolId) {
if (isBlockTokenEnabled()) {
blockTokenSecretManager.setBlockPoolId(blockPoolId);
}
}
public BlockStoragePolicySuite getStoragePolicySuite() {
return storagePolicySuite;
}
/** get the BlockTokenSecretManager */
@VisibleForTesting
public BlockTokenSecretManager getBlockTokenSecretManager() {
return blockTokenSecretManager;
}
/** Allow silent termination of replication monitor for testing */
@VisibleForTesting
void enableRMTerminationForTesting() {
checkNSRunning = false;
}
private boolean isBlockTokenEnabled() {
return blockTokenSecretManager != null;
}
/** Should the access keys be updated? */
boolean shouldUpdateBlockKey(final long updateTime) throws IOException {
return isBlockTokenEnabled()? blockTokenSecretManager.updateKeys(updateTime)
: false;
}
public void activate(Configuration conf) {
pendingReplications.start();
datanodeManager.activate(conf);
this.replicationThread.setName("ReplicationMonitor");
this.replicationThread.start();
this.blockReportThread.start();
mxBeanName = MBeans.register("NameNode", "BlockStats", this);
}
public void close() {
try {
replicationThread.interrupt();
blockReportThread.interrupt();
replicationThread.join(3000);
blockReportThread.join(3000);
} catch (InterruptedException ie) {
}
datanodeManager.close();
pendingReplications.stop();
blocksMap.close();
}
/** @return the datanodeManager */
public DatanodeManager getDatanodeManager() {
return datanodeManager;
}
@VisibleForTesting
public BlockPlacementPolicy getBlockPlacementPolicy() {
return blockplacement;
}
/** Set BlockPlacementPolicy */
public void setBlockPlacementPolicy(BlockPlacementPolicy newpolicy) {
if (newpolicy == null) {
throw new HadoopIllegalArgumentException("newpolicy == null");
}
this.blockplacement = newpolicy;
}
/** Dump meta data to out. */
public void metaSave(PrintWriter out) {
assert namesystem.hasWriteLock();
final List<DatanodeDescriptor> live = new ArrayList<DatanodeDescriptor>();
final List<DatanodeDescriptor> dead = new ArrayList<DatanodeDescriptor>();
datanodeManager.fetchDatanodes(live, dead, false);
out.println("Live Datanodes: " + live.size());
out.println("Dead Datanodes: " + dead.size());
//
// Dump contents of neededReplication
//
synchronized (neededReplications) {
out.println("Metasave: Blocks waiting for replication: " +
neededReplications.size());
for (Block block : neededReplications) {
dumpBlockMeta(block, out);
}
}
// Dump any postponed over-replicated blocks
out.println("Mis-replicated blocks that have been postponed:");
for (Block block : postponedMisreplicatedBlocks) {
dumpBlockMeta(block, out);
}
// Dump blocks from pendingReplication
pendingReplications.metaSave(out);
// Dump blocks that are waiting to be deleted
invalidateBlocks.dump(out);
//Dump corrupt blocks and their storageIDs
Set<Block> corruptBlocks = corruptReplicas.getCorruptBlocks();
out.println("Corrupt Blocks:");
for(Block block : corruptBlocks) {
Collection<DatanodeDescriptor> corruptNodes =
corruptReplicas.getNodes(block);
if (corruptNodes == null) {
LOG.warn(block.getBlockId() +
" is corrupt but has no associated node.");
continue;
}
int numNodesToFind = corruptNodes.size();
for (DatanodeStorageInfo storage : blocksMap.getStorages(block)) {
DatanodeDescriptor node = storage.getDatanodeDescriptor();
if (corruptNodes.contains(node)) {
String storageId = storage.getStorageID();
DatanodeStorageInfo storageInfo = node.getStorageInfo(storageId);
State state = (storageInfo == null) ? null : storageInfo.getState();
out.println("Block=" + block.getBlockId() + "\tNode=" + node.getName()
+ "\tStorageID=" + storageId + "\tStorageState=" + state
+ "\tTotalReplicas=" +
blocksMap.numNodes(block)
+ "\tReason=" + corruptReplicas.getCorruptReason(block, node));
numNodesToFind--;
if (numNodesToFind == 0) {
break;
}
}
}
if (numNodesToFind > 0) {
String[] corruptNodesList = new String[corruptNodes.size()];
int i = 0;
for (DatanodeDescriptor d : corruptNodes) {
corruptNodesList[i] = d.getHostName();
i++;
}
out.println(block.getBlockId() + " corrupt on " +
StringUtils.join(",", corruptNodesList) + " but not all nodes are" +
"found in its block locations");
}
}
// Dump all datanodes
getDatanodeManager().datanodeDump(out);
}
/**
* Dump the metadata for the given block in a human-readable
* form.
*/
private void dumpBlockMeta(Block block, PrintWriter out) {
List<DatanodeDescriptor> containingNodes =
new ArrayList<DatanodeDescriptor>();
List<DatanodeStorageInfo> containingLiveReplicasNodes =
new ArrayList<DatanodeStorageInfo>();
NumberReplicas numReplicas = new NumberReplicas();
// source node returned is not used
chooseSourceDatanode(block, containingNodes,
containingLiveReplicasNodes, numReplicas,
UnderReplicatedBlocks.LEVEL);
// containingLiveReplicasNodes can include READ_ONLY_SHARED replicas which are
// not included in the numReplicas.liveReplicas() count
assert containingLiveReplicasNodes.size() >= numReplicas.liveReplicas();
int usableReplicas = numReplicas.liveReplicas() +
numReplicas.decommissionedAndDecommissioning();
if (block instanceof BlockInfo) {
BlockCollection bc = getBlockCollection((BlockInfo)block);
String fileName = (bc == null) ? "[orphaned]" : bc.getName();
out.print(fileName + ": ");
}
// l: == live:, d: == decommissioned c: == corrupt e: == excess
out.print(block + ((usableReplicas > 0)? "" : " MISSING") +
" (replicas:" +
" l: " + numReplicas.liveReplicas() +
" d: " + numReplicas.decommissionedAndDecommissioning() +
" c: " + numReplicas.corruptReplicas() +
" e: " + numReplicas.excessReplicas() + ") ");
Collection<DatanodeDescriptor> corruptNodes =
corruptReplicas.getNodes(block);
for (DatanodeStorageInfo storage : blocksMap.getStorages(block)) {
final DatanodeDescriptor node = storage.getDatanodeDescriptor();
String state = "";
if (corruptNodes != null && corruptNodes.contains(node)) {
state = "(corrupt)";
} else if (node.isDecommissioned() ||
node.isDecommissionInProgress()) {
state = "(decommissioned)";
}
if (storage.areBlockContentsStale()) {
state += " (block deletions maybe out of date)";
}
out.print(" " + node + state + " : ");
}
out.println("");
}
/** @return maxReplicationStreams */
public int getMaxReplicationStreams() {
return maxReplicationStreams;
}
/**
* @return true if the block has minimum replicas
*/
public boolean checkMinReplication(BlockInfo block) {
return (countNodes(block).liveReplicas() >= minReplication);
}
public short getMinReplication() {
return minReplication;
}
/**
* Commit a block of a file
*
* @param block block to be committed
* @param commitBlock - contains client reported block length and generation
* @return true if the block is changed to committed state.
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
private boolean commitBlock(final BlockInfo block,
final Block commitBlock) throws IOException {
if (block.getBlockUCState() == BlockUCState.COMMITTED)
return false;
assert block.getNumBytes() <= commitBlock.getNumBytes() :
"commitBlock length is less than the stored one "
+ commitBlock.getNumBytes() + " vs. " + block.getNumBytes();
if(block.getGenerationStamp() != commitBlock.getGenerationStamp()) {
throw new IOException("Commit block with mismatching GS. NN has " +
block + ", client submits " + commitBlock);
}
List<ReplicaUnderConstruction> staleReplicas =
block.commitBlock(commitBlock);
removeStaleReplicas(staleReplicas, block);
return true;
}
/**
* Commit the last block of the file and mark it as complete if it has
* meets the minimum replication requirement
*
* @param bc block collection
* @param commitBlock - contains client reported block length and generation
* @param iip - INodes in path to bc
* @return true if the last block is changed to committed state.
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
public boolean commitOrCompleteLastBlock(BlockCollection bc,
Block commitBlock, INodesInPath iip) throws IOException {
if(commitBlock == null)
return false; // not committing, this is a block allocation retry
BlockInfo lastBlock = bc.getLastBlock();
if(lastBlock == null)
return false; // no blocks in file yet
if(lastBlock.isComplete())
return false; // already completed (e.g. by syncBlock)
final boolean committed = commitBlock(lastBlock, commitBlock);
// Count replicas on decommissioning nodes, as these will not be
// decommissioned unless recovery/completing last block has finished
NumberReplicas numReplicas = countNodes(lastBlock);
if (numReplicas.liveReplicas() + numReplicas.decommissioning() >=
minReplication) {
if (committed) {
addExpectedReplicasToPending(lastBlock);
}
completeBlock(lastBlock, iip, false);
}
return committed;
}
/**
* If IBR is not sent from expected locations yet, add the datanodes to
* pendingReplications in order to keep ReplicationMonitor from scheduling
* the block.
*/
public void addExpectedReplicasToPending(BlockInfo blk) {
DatanodeStorageInfo[] expectedStorages =
blk.getUnderConstructionFeature().getExpectedStorageLocations();
if (expectedStorages.length - blk.numNodes() > 0) {
ArrayList<DatanodeDescriptor> pendingNodes =
new ArrayList<DatanodeDescriptor>();
for (DatanodeStorageInfo storage : expectedStorages) {
DatanodeDescriptor dnd = storage.getDatanodeDescriptor();
if (blk.findStorageInfo(dnd) == null) {
pendingNodes.add(dnd);
}
pendingReplications.increment(blk,
pendingNodes.toArray(new DatanodeDescriptor[pendingNodes.size()]));
}
}
}
/**
* Convert a specified block of the file to a complete block.
* @param curBlock - block to be completed
* @param iip - INodes in path to file containing curBlock; if null,
* this will be resolved internally
* @param force - force completion of the block
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
private void completeBlock(BlockInfo curBlock, INodesInPath iip,
boolean force) throws IOException {
if (curBlock.isComplete()) {
return;
}
int numNodes = curBlock.numNodes();
if (!force && numNodes < minReplication) {
throw new IOException("Cannot complete block: "
+ "block does not satisfy minimal replication requirement.");
}
if (!force && curBlock.getBlockUCState() != BlockUCState.COMMITTED) {
throw new IOException(
"Cannot complete block: block has not been COMMITTED by the client");
}
convertToCompleteBlock(curBlock, iip);
// Since safe-mode only counts complete blocks, and we now have
// one more complete block, we need to adjust the total up, and
// also count it as safe, if we have at least the minimum replica
// count. (We may not have the minimum replica count yet if this is
// a "forced" completion when a file is getting closed by an
// OP_CLOSE edit on the standby).
namesystem.adjustSafeModeBlockTotals(0, 1);
namesystem.incrementSafeBlockCount(
Math.min(numNodes, minReplication));
}
/**
* Convert a specified block of the file to a complete block.
* Skips validity checking and safe mode block total updates; use
* {@link BlockManager#completeBlock} to include these.
* @param curBlock - block to be completed
* @param iip - INodes in path to file containing curBlock; if null,
* this will be resolved internally
* @throws IOException if the block does not have at least a minimal number
* of replicas reported from data-nodes.
*/
private void convertToCompleteBlock(BlockInfo curBlock, INodesInPath iip)
throws IOException {
curBlock.convertToCompleteBlock();
namesystem.getFSDirectory().updateSpaceForCompleteBlock(curBlock, iip);
}
/**
* Force the given block in the given file to be marked as complete,
* regardless of whether enough replicas are present. This is necessary
* when tailing edit logs as a Standby.
*/
public void forceCompleteBlock(final BlockInfo block) throws IOException {
List<ReplicaUnderConstruction> staleReplicas = block.commitBlock(block);
removeStaleReplicas(staleReplicas, block);
completeBlock(block, null, true);
}
/**
* Convert the last block of the file to an under construction block.<p>
* The block is converted only if the file has blocks and the last one
* is a partial block (its size is less than the preferred block size).
* The converted block is returned to the client.
* The client uses the returned block locations to form the data pipeline
* for this block.<br>
* The methods returns null if there is no partial block at the end.
* The client is supposed to allocate a new block with the next call.
*
* @param bc file
* @param bytesToRemove num of bytes to remove from block
* @return the last block locations if the block is partial or null otherwise
*/
public LocatedBlock convertLastBlockToUnderConstruction(
BlockCollection bc, long bytesToRemove) throws IOException {
BlockInfo lastBlock = bc.getLastBlock();
if (lastBlock == null ||
bc.getPreferredBlockSize() == lastBlock.getNumBytes() - bytesToRemove) {
return null;
}
assert lastBlock == getStoredBlock(lastBlock) :
"last block of the file is not in blocksMap";
DatanodeStorageInfo[] targets = getStorages(lastBlock);
// convert the last block to under construction. note no block replacement
// is happening
bc.convertLastBlockToUC(lastBlock, targets);
// Remove block from replication queue.
NumberReplicas replicas = countNodes(lastBlock);
neededReplications.remove(lastBlock, replicas.liveReplicas(),
replicas.readOnlyReplicas(),
replicas.decommissionedAndDecommissioning(), getReplication(lastBlock));
pendingReplications.remove(lastBlock);
// remove this block from the list of pending blocks to be deleted.
for (DatanodeStorageInfo storage : targets) {
invalidateBlocks.remove(storage.getDatanodeDescriptor(), lastBlock);
}
// Adjust safe-mode totals, since under-construction blocks don't
// count in safe-mode.
namesystem.adjustSafeModeBlockTotals(
// decrement safe if we had enough
targets.length >= minReplication ? -1 : 0,
// always decrement total blocks
-1);
final long fileLength = bc.computeContentSummary(
getStoragePolicySuite()).getLength();
final long pos = fileLength - lastBlock.getNumBytes();
return createLocatedBlock(lastBlock, pos,
BlockTokenIdentifier.AccessMode.WRITE);
}
/**
* Get all valid locations of the block
*/
private List<DatanodeStorageInfo> getValidLocations(Block block) {
final List<DatanodeStorageInfo> locations
= new ArrayList<DatanodeStorageInfo>(blocksMap.numNodes(block));
for(DatanodeStorageInfo storage : blocksMap.getStorages(block)) {
// filter invalidate replicas
if(!invalidateBlocks.contains(storage.getDatanodeDescriptor(), block)) {
locations.add(storage);
}
}
return locations;
}
private List<LocatedBlock> createLocatedBlockList(
final BlockInfo[] blocks,
final long offset, final long length, final int nrBlocksToReturn,
final AccessMode mode) throws IOException {
int curBlk = 0;
long curPos = 0, blkSize = 0;
int nrBlocks = (blocks[0].getNumBytes() == 0) ? 0 : blocks.length;
for (curBlk = 0; curBlk < nrBlocks; curBlk++) {
blkSize = blocks[curBlk].getNumBytes();
assert blkSize > 0 : "Block of size 0";
if (curPos + blkSize > offset) {
break;
}
curPos += blkSize;
}
if (nrBlocks > 0 && curBlk == nrBlocks) // offset >= end of file
return Collections.<LocatedBlock>emptyList();
long endOff = offset + length;
List<LocatedBlock> results = new ArrayList<LocatedBlock>(blocks.length);
do {
results.add(createLocatedBlock(blocks[curBlk], curPos, mode));
curPos += blocks[curBlk].getNumBytes();
curBlk++;
} while (curPos < endOff
&& curBlk < blocks.length
&& results.size() < nrBlocksToReturn);
return results;
}
private LocatedBlock createLocatedBlock(final BlockInfo[] blocks,
final long endPos, final AccessMode mode) throws IOException {
int curBlk = 0;
long curPos = 0;
int nrBlocks = (blocks[0].getNumBytes() == 0) ? 0 : blocks.length;
for (curBlk = 0; curBlk < nrBlocks; curBlk++) {
long blkSize = blocks[curBlk].getNumBytes();
if (curPos + blkSize >= endPos) {
break;
}
curPos += blkSize;
}
return createLocatedBlock(blocks[curBlk], curPos, mode);
}
private LocatedBlock createLocatedBlock(final BlockInfo blk, final long pos,
final AccessMode mode) throws IOException {
final LocatedBlock lb = createLocatedBlock(blk, pos);
if (mode != null) {
setBlockToken(lb, mode);
}
return lb;
}
/** @return a LocatedBlock for the given block */
private LocatedBlock createLocatedBlock(final BlockInfo blk, final long pos
) throws IOException {
if (!blk.isComplete()) {
final DatanodeStorageInfo[] storages = blk.getUnderConstructionFeature()
.getExpectedStorageLocations();
final ExtendedBlock eb = new ExtendedBlock(namesystem.getBlockPoolId(), blk);
return newLocatedBlock(eb, storages, pos, false);
}
// get block locations
final int numCorruptNodes = countNodes(blk).corruptReplicas();
final int numCorruptReplicas = corruptReplicas.numCorruptReplicas(blk);
if (numCorruptNodes != numCorruptReplicas) {
LOG.warn("Inconsistent number of corrupt replicas for "
+ blk + " blockMap has " + numCorruptNodes
+ " but corrupt replicas map has " + numCorruptReplicas);
}
final int numNodes = blocksMap.numNodes(blk);
final boolean isCorrupt = numCorruptReplicas == numNodes;
final int numMachines = isCorrupt ? numNodes: numNodes - numCorruptReplicas;
DatanodeStorageInfo[] machines = new DatanodeStorageInfo[numMachines];
int j = 0;
if (numMachines > 0) {
final boolean noCorrupt = (numCorruptReplicas == 0);
for(DatanodeStorageInfo storage : blocksMap.getStorages(blk)) {
if (storage.getState() != State.FAILED) {
if (noCorrupt) {
machines[j++] = storage;
} else {
final DatanodeDescriptor d = storage.getDatanodeDescriptor();
final boolean replicaCorrupt = isReplicaCorrupt(blk, d);
if (isCorrupt || !replicaCorrupt) {
machines[j++] = storage;
}
}
}
}
}
if(j < machines.length) {
machines = Arrays.copyOf(machines, j);
}
assert j == machines.length :
"isCorrupt: " + isCorrupt +
" numMachines: " + numMachines +
" numNodes: " + numNodes +
" numCorrupt: " + numCorruptNodes +
" numCorruptRepls: " + numCorruptReplicas;
final ExtendedBlock eb = new ExtendedBlock(namesystem.getBlockPoolId(), blk);
return newLocatedBlock(eb, machines, pos, isCorrupt);
}
/** Create a LocatedBlocks. */
public LocatedBlocks createLocatedBlocks(final BlockInfo[] blocks,
final long fileSizeExcludeBlocksUnderConstruction,
final boolean isFileUnderConstruction, final long offset,
final long length, final boolean needBlockToken,
final boolean inSnapshot, FileEncryptionInfo feInfo)
throws IOException {
assert namesystem.hasReadLock();
if (blocks == null) {
return null;
} else if (blocks.length == 0) {
return new LocatedBlocks(0, isFileUnderConstruction,
Collections.<LocatedBlock>emptyList(), null, false, feInfo);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("blocks = " + java.util.Arrays.asList(blocks));
}
final AccessMode mode = needBlockToken? BlockTokenIdentifier.AccessMode.READ: null;
final List<LocatedBlock> locatedblocks = createLocatedBlockList(
blocks, offset, length, Integer.MAX_VALUE, mode);
final LocatedBlock lastlb;
final boolean isComplete;
if (!inSnapshot) {
final BlockInfo last = blocks[blocks.length - 1];
final long lastPos = last.isComplete()?
fileSizeExcludeBlocksUnderConstruction - last.getNumBytes()
: fileSizeExcludeBlocksUnderConstruction;
lastlb = createLocatedBlock(last, lastPos, mode);
isComplete = last.isComplete();
} else {
lastlb = createLocatedBlock(blocks,
fileSizeExcludeBlocksUnderConstruction, mode);
isComplete = true;
}
LocatedBlocks locations = new LocatedBlocks(
fileSizeExcludeBlocksUnderConstruction, isFileUnderConstruction,
locatedblocks, lastlb, isComplete, feInfo);
// Set caching information for the located blocks.
CacheManager cm = namesystem.getCacheManager();
if (cm != null) {
cm.setCachedLocations(locations);
}
return locations;
}
}
/** @return current access keys. */
public ExportedBlockKeys getBlockKeys() {
return isBlockTokenEnabled()? blockTokenSecretManager.exportKeys()
: ExportedBlockKeys.DUMMY_KEYS;
}
/** Generate a block token for the located block. */
public void setBlockToken(final LocatedBlock b,
final AccessMode mode) throws IOException {
if (isBlockTokenEnabled()) {
// Use cached UGI if serving RPC calls.
b.setBlockToken(blockTokenSecretManager.generateToken(
NameNode.getRemoteUser().getShortUserName(),
b.getBlock(), EnumSet.of(mode)));
}
}
void addKeyUpdateCommand(final List<DatanodeCommand> cmds,
final DatanodeDescriptor nodeinfo) {
// check access key update
if (isBlockTokenEnabled() && nodeinfo.needKeyUpdate()) {
cmds.add(new KeyUpdateCommand(blockTokenSecretManager.exportKeys()));
nodeinfo.setNeedKeyUpdate(false);
}
}
public DataEncryptionKey generateDataEncryptionKey() {
if (isBlockTokenEnabled() && encryptDataTransfer) {
return blockTokenSecretManager.generateDataEncryptionKey();
} else {
return null;
}
}
/**
* Clamp the specified replication between the minimum and the maximum
* replication levels.
*/
public short adjustReplication(short replication) {
return replication < minReplication? minReplication
: replication > maxReplication? maxReplication: replication;
}
/**
* Check whether the replication parameter is within the range
* determined by system configuration and throw an exception if it's not.
*
* @param src the path to the target file
* @param replication the requested replication factor
* @param clientName the name of the client node making the request
* @throws java.io.IOException thrown if the requested replication factor
* is out of bounds
*/
public void verifyReplication(String src,
short replication,
String clientName) throws IOException {
String err = null;
if (replication > maxReplication) {
err = " exceeds maximum of " + maxReplication;
} else if (replication < minReplication) {
err = " is less than the required minimum of " + minReplication;
}
if (err != null) {
throw new IOException("Requested replication factor of " + replication
+ err + " for " + src
+ (clientName == null? "": ", clientName=" + clientName));
}
}
/**
* Check if a block is replicated to at least the minimum replication.
*/
public boolean isSufficientlyReplicated(BlockInfo b) {
// Compare against the lesser of the minReplication and number of live DNs.
final int replication =
Math.min(minReplication, getDatanodeManager().getNumLiveDataNodes());
return countNodes(b).liveReplicas() >= replication;
}
/**
* return a list of blocks & their locations on <code>datanode</code> whose
* total size is <code>size</code>
*
* @param datanode on which blocks are located
* @param size total size of blocks
*/
public BlocksWithLocations getBlocks(DatanodeID datanode, long size
) throws IOException {
namesystem.checkOperation(OperationCategory.READ);
namesystem.readLock();
try {
namesystem.checkOperation(OperationCategory.READ);
return getBlocksWithLocations(datanode, size);
} finally {
namesystem.readUnlock();
}
}
/** Get all blocks with location information from a datanode. */
private BlocksWithLocations getBlocksWithLocations(final DatanodeID datanode,
final long size) throws UnregisteredNodeException {
final DatanodeDescriptor node = getDatanodeManager().getDatanode(datanode);
if (node == null) {
blockLog.warn("BLOCK* getBlocks: Asking for blocks from an" +
" unrecorded node {}", datanode);
throw new HadoopIllegalArgumentException(
"Datanode " + datanode + " not found.");
}
int numBlocks = node.numBlocks();
if(numBlocks == 0) {
return new BlocksWithLocations(new BlockWithLocations[0]);
}
// starting from a random block
int startBlock = ThreadLocalRandom.current().nextInt(numBlocks);
Iterator<BlockInfo> iter = node.getBlockIterator(startBlock);
List<BlockWithLocations> results = new ArrayList<BlockWithLocations>();
long totalSize = 0;
BlockInfo curBlock;
while(totalSize<size && iter.hasNext()) {
curBlock = iter.next();
if(!curBlock.isComplete()) continue;
if (curBlock.getNumBytes() < getBlocksMinBlockSize) {
continue;
}
totalSize += addBlock(curBlock, results);
}
if(totalSize<size) {
iter = node.getBlockIterator(); // start from the beginning
for(int i=0; i<startBlock&&totalSize<size; i++) {
curBlock = iter.next();
if(!curBlock.isComplete()) continue;
if (curBlock.getNumBytes() < getBlocksMinBlockSize) {
continue;
}
totalSize += addBlock(curBlock, results);
}
}
return new BlocksWithLocations(
results.toArray(new BlockWithLocations[results.size()]));
}
/** Remove the blocks associated to the given datanode. */
void removeBlocksAssociatedTo(final DatanodeDescriptor node) {
final Iterator<? extends Block> it = node.getBlockIterator();
while(it.hasNext()) {
removeStoredBlock(it.next(), node);
}
// Remove all pending DN messages referencing this DN.
pendingDNMessages.removeAllMessagesForDatanode(node);
node.resetBlocks();
invalidateBlocks.remove(node);
}
/** Remove the blocks associated to the given DatanodeStorageInfo. */
void removeBlocksAssociatedTo(final DatanodeStorageInfo storageInfo) {
assert namesystem.hasWriteLock();
final Iterator<? extends Block> it = storageInfo.getBlockIterator();
DatanodeDescriptor node = storageInfo.getDatanodeDescriptor();
while(it.hasNext()) {
Block block = it.next();
removeStoredBlock(block, node);
invalidateBlocks.remove(node, block);
}
namesystem.checkSafeMode();
LOG.info("Removed blocks associated with storage {} from DataNode {}",
storageInfo, node);
}
/**
* Adds block to list of blocks which will be invalidated on specified
* datanode and log the operation
*/
void addToInvalidates(final Block block, final DatanodeInfo datanode) {
if (!isPopulatingReplQueues()) {
return;
}
invalidateBlocks.add(block, datanode, true);
}
/**
* Adds block to list of blocks which will be invalidated on all its
* datanodes.
*/
private void addToInvalidates(Block b) {
if (!isPopulatingReplQueues()) {
return;
}
StringBuilder datanodes = new StringBuilder();
for (DatanodeStorageInfo storage : blocksMap.getStorages(b)) {
if (storage.getState() != State.NORMAL) {
continue;
}
final DatanodeDescriptor node = storage.getDatanodeDescriptor();
invalidateBlocks.add(b, node, false);
datanodes.append(node).append(" ");
}
if (datanodes.length() != 0) {
blockLog.debug("BLOCK* addToInvalidates: {} {}", b, datanodes);
}
}
/**
* Remove all block invalidation tasks under this datanode UUID;
* used when a datanode registers with a new UUID and the old one
* is wiped.
*/
void removeFromInvalidates(final DatanodeInfo datanode) {
if (!isPopulatingReplQueues()) {
return;
}
invalidateBlocks.remove(datanode);
}
/**
* Mark the block belonging to datanode as corrupt
* @param blk Block to be marked as corrupt
* @param dn Datanode which holds the corrupt replica
* @param storageID if known, null otherwise.
* @param reason a textual reason why the block should be marked corrupt,
* for logging purposes
*/
public void findAndMarkBlockAsCorrupt(final ExtendedBlock blk,
final DatanodeInfo dn, String storageID, String reason) throws IOException {
assert namesystem.hasWriteLock();
final BlockInfo storedBlock = getStoredBlock(blk.getLocalBlock());
if (storedBlock == null) {
// Check if the replica is in the blockMap, if not
// ignore the request for now. This could happen when BlockScanner
// thread of Datanode reports bad block before Block reports are sent
// by the Datanode on startup
blockLog.debug("BLOCK* findAndMarkBlockAsCorrupt: {} not found", blk);
return;
}
DatanodeDescriptor node = getDatanodeManager().getDatanode(dn);
if (node == null) {
throw new IOException("Cannot mark " + blk
+ " as corrupt because datanode " + dn + " (" + dn.getDatanodeUuid()
+ ") does not exist");
}
DatanodeStorageInfo storage = null;
if (storageID != null) {
storage = node.getStorageInfo(storageID);
}
if (storage == null) {
storage = storedBlock.findStorageInfo(node);
}
if (storage == null) {
blockLog.debug("BLOCK* findAndMarkBlockAsCorrupt: {} not found on {}",
blk, dn);
return;
}
markBlockAsCorrupt(new BlockToMarkCorrupt(storedBlock,
blk.getGenerationStamp(), reason, Reason.CORRUPTION_REPORTED),
storage, node);
}
/**
*
* @param b
* @param storageInfo storage that contains the block, if known. null otherwise.
* @throws IOException
*/
private void markBlockAsCorrupt(BlockToMarkCorrupt b,
DatanodeStorageInfo storageInfo,
DatanodeDescriptor node) throws IOException {
if (b.getCorrupted().isDeleted()) {
blockLog.debug("BLOCK markBlockAsCorrupt: {} cannot be marked as" +
" corrupt as it does not belong to any file", b);
addToInvalidates(b.getCorrupted(), node);
return;
}
short expectedReplicas = b.getCorrupted().getReplication();
// Add replica to the data-node if it is not already there
if (storageInfo != null) {
storageInfo.addBlock(b.getStored());
}
// Add this replica to corruptReplicas Map
corruptReplicas.addToCorruptReplicasMap(b.getCorrupted(), node,
b.getReason(), b.getReasonCode());
NumberReplicas numberOfReplicas = countNodes(b.getStored());
boolean hasEnoughLiveReplicas = numberOfReplicas.liveReplicas() >=
expectedReplicas;
boolean minReplicationSatisfied =
numberOfReplicas.liveReplicas() >= minReplication;
boolean hasMoreCorruptReplicas = minReplicationSatisfied &&
(numberOfReplicas.liveReplicas() + numberOfReplicas.corruptReplicas()) >
expectedReplicas;
boolean corruptedDuringWrite = minReplicationSatisfied &&
b.isCorruptedDuringWrite();
// case 1: have enough number of live replicas
// case 2: corrupted replicas + live replicas > Replication factor
// case 3: Block is marked corrupt due to failure while writing. In this
// case genstamp will be different than that of valid block.
// In all these cases we can delete the replica.
// In case of 3, rbw block will be deleted and valid block can be replicated
if (hasEnoughLiveReplicas || hasMoreCorruptReplicas
|| corruptedDuringWrite) {
// the block is over-replicated so invalidate the replicas immediately
invalidateBlock(b, node);
} else if (isPopulatingReplQueues()) {
// add the block to neededReplication
updateNeededReplications(b.getStored(), -1, 0);
}
}
/**
* Invalidates the given block on the given datanode.
* @return true if the block was successfully invalidated and no longer
* present in the BlocksMap
*/
private boolean invalidateBlock(BlockToMarkCorrupt b, DatanodeInfo dn
) throws IOException {
blockLog.debug("BLOCK* invalidateBlock: {} on {}", b, dn);
DatanodeDescriptor node = getDatanodeManager().getDatanode(dn);
if (node == null) {
throw new IOException("Cannot invalidate " + b
+ " because datanode " + dn + " does not exist.");
}
// Check how many copies we have of the block
NumberReplicas nr = countNodes(b.getStored());
if (nr.replicasOnStaleNodes() > 0) {
blockLog.debug("BLOCK* invalidateBlocks: postponing " +
"invalidation of {} on {} because {} replica(s) are located on " +
"nodes with potentially out-of-date block reports", b, dn,
nr.replicasOnStaleNodes());
postponeBlock(b.getCorrupted());
return false;
} else if (nr.liveReplicas() >= 1) {
// If we have at least one copy on a live node, then we can delete it.
addToInvalidates(b.getCorrupted(), dn);
removeStoredBlock(b.getStored(), node);
blockLog.debug("BLOCK* invalidateBlocks: {} on {} listed for deletion.",
b, dn);
return true;
} else {
blockLog.debug("BLOCK* invalidateBlocks: {} on {} is the only copy and" +
" was not deleted", b, dn);
return false;
}
}
public void setPostponeBlocksFromFuture(boolean postpone) {
this.shouldPostponeBlocksFromFuture = postpone;
}
private void postponeBlock(Block blk) {
postponedMisreplicatedBlocks.add(blk);
}
void updateState() {
pendingReplicationBlocksCount = pendingReplications.size();
underReplicatedBlocksCount = neededReplications.size();
corruptReplicaBlocksCount = corruptReplicas.size();
}
/** Return number of under-replicated but not missing blocks */
public int getUnderReplicatedNotMissingBlocks() {
return neededReplications.getUnderReplicatedBlockCount();
}
/**
* Schedule blocks for deletion at datanodes
* @param nodesToProcess number of datanodes to schedule deletion work
* @return total number of block for deletion
*/
int computeInvalidateWork(int nodesToProcess) {
final List<DatanodeInfo> nodes = invalidateBlocks.getDatanodes();
Collections.shuffle(nodes);
nodesToProcess = Math.min(nodes.size(), nodesToProcess);
int blockCnt = 0;
for (DatanodeInfo dnInfo : nodes) {
int blocks = invalidateWorkForOneNode(dnInfo);
if (blocks > 0) {
blockCnt += blocks;
if (--nodesToProcess == 0) {
break;
}
}
}
return blockCnt;
}
/**
* Scan blocks in {@link #neededReplications} and assign replication
* work to data-nodes they belong to.
*
* The number of process blocks equals either twice the number of live
* data-nodes or the number of under-replicated blocks whichever is less.
*
* @return number of blocks scheduled for replication during this iteration.
*/
int computeReplicationWork(int blocksToProcess) {
List<List<BlockInfo>> blocksToReplicate = null;
namesystem.writeLock();
try {
// Choose the blocks to be replicated
blocksToReplicate = neededReplications
.chooseUnderReplicatedBlocks(blocksToProcess);
} finally {
namesystem.writeUnlock();
}
return computeReplicationWorkForBlocks(blocksToReplicate);
}
/** Replicate a set of blocks
*
* @param blocksToReplicate blocks to be replicated, for each priority
* @return the number of blocks scheduled for replication
*/
@VisibleForTesting
int computeReplicationWorkForBlocks(List<List<BlockInfo>> blocksToReplicate) {
int scheduledWork = 0;
final List<ReplicationWork> work = new LinkedList<>();
namesystem.writeLock();
try {
synchronized (neededReplications) {
for (int priority = 0; priority < blocksToReplicate.size(); priority++) {
for (BlockInfo block : blocksToReplicate.get(priority)) {
ReplicationWork rw = scheduleReplication(block, priority);
if (rw != null) {
work.add(rw);
}
}
}
}
} finally {
namesystem.writeUnlock();
}
final Set<Node> excludedNodes = new HashSet<>();
for(ReplicationWork rw : work){
// Exclude all of the containing nodes from being targets.
// This list includes decommissioning or corrupt nodes.
excludedNodes.clear();
for (DatanodeDescriptor dn : rw.getContainingNodes()) {
excludedNodes.add(dn);
}
// choose replication targets: NOT HOLDING THE GLOBAL LOCK
rw.chooseTargets(blockplacement, storagePolicySuite, excludedNodes);
}
namesystem.writeLock();
try {
for(ReplicationWork rw : work){
final DatanodeStorageInfo[] targets = rw.getTargets();
if(targets == null || targets.length == 0){
rw.resetTargets();
continue;
}
synchronized (neededReplications) {
if (validateReplicationWork(rw)) {
scheduledWork++;
}
}
}
} finally {
namesystem.writeUnlock();
}
if (blockLog.isInfoEnabled()) {
// log which blocks have been scheduled for replication
for(ReplicationWork rw : work){
DatanodeStorageInfo[] targets = rw.getTargets();
if (targets != null && targets.length != 0) {
StringBuilder targetList = new StringBuilder("datanode(s)");
for (DatanodeStorageInfo target : targets) {
targetList.append(' ');
targetList.append(target.getDatanodeDescriptor());
}
blockLog.debug("BLOCK* ask {} to replicate {} to {}", rw.getSrcNode(),
rw.getBlock(), targetList);
}
}
}
if (blockLog.isDebugEnabled()) {
blockLog.debug("BLOCK* neededReplications = {} pendingReplications = {}",
neededReplications.size(), pendingReplications.size());
}
return scheduledWork;
}
boolean hasEnoughEffectiveReplicas(BlockInfo block,
NumberReplicas numReplicas, int pendingReplicaNum, int required) {
int numEffectiveReplicas = numReplicas.liveReplicas() + pendingReplicaNum;
return (numEffectiveReplicas >= required) &&
(pendingReplicaNum > 0 || isPlacementPolicySatisfied(block));
}
private ReplicationWork scheduleReplication(BlockInfo block, int priority) {
// skip abandoned block or block reopened for append
if (block.isDeleted() || !block.isCompleteOrCommitted()) {
// remove from neededReplications
neededReplications.remove(block, priority);
return null;
}
short requiredReplication = getExpectedReplicaNum(block);
// get a source data-node
List<DatanodeDescriptor> containingNodes = new ArrayList<>();
List<DatanodeStorageInfo> liveReplicaNodes = new ArrayList<>();
NumberReplicas numReplicas = new NumberReplicas();
DatanodeDescriptor srcNode = chooseSourceDatanode(block, containingNodes,
liveReplicaNodes, numReplicas, priority);
if (srcNode == null) { // block can not be replicated from any node
LOG.debug("Block " + block + " cannot be repl from any node");
return null;
}
// liveReplicaNodes can include READ_ONLY_SHARED replicas which are
// not included in the numReplicas.liveReplicas() count
assert liveReplicaNodes.size() >= numReplicas.liveReplicas();
int pendingNum = pendingReplications.getNumReplicas(block);
if (hasEnoughEffectiveReplicas(block, numReplicas, pendingNum,
requiredReplication)) {
neededReplications.remove(block, priority);
blockLog.debug("BLOCK* Removing {} from neededReplications as" +
" it has enough replicas", block);
return null;
}
final int additionalReplRequired;
if (numReplicas.liveReplicas() < requiredReplication) {
additionalReplRequired = requiredReplication - numReplicas.liveReplicas()
- pendingNum;
} else {
additionalReplRequired = 1; // Needed on a new rack
}
final BlockCollection bc = getBlockCollection(block);
return new ReplicationWork(block, bc, srcNode, containingNodes,
liveReplicaNodes, additionalReplRequired, priority);
}
private boolean validateReplicationWork(ReplicationWork rw) {
BlockInfo block = rw.getBlock();
int priority = rw.getPriority();
// Recheck since global lock was released
// skip abandoned block or block reopened for append
if (block.isDeleted() || !block.isCompleteOrCommitted()) {
neededReplications.remove(block, priority);
rw.resetTargets();
return false;
}
// do not schedule more if enough replicas is already pending
final short requiredReplication = getExpectedReplicaNum(block);
NumberReplicas numReplicas = countNodes(block);
final int pendingNum = pendingReplications.getNumReplicas(block);
if (hasEnoughEffectiveReplicas(block, numReplicas, pendingNum,
requiredReplication)) {
neededReplications.remove(block, priority);
rw.resetTargets();
blockLog.debug("BLOCK* Removing {} from neededReplications as" +
" it has enough replicas", block);
return false;
}
DatanodeStorageInfo[] targets = rw.getTargets();
if ( (numReplicas.liveReplicas() >= requiredReplication) &&
(!isPlacementPolicySatisfied(block)) ) {
if (rw.getSrcNode().getNetworkLocation().equals(
targets[0].getDatanodeDescriptor().getNetworkLocation())) {
//No use continuing, unless a new rack in this case
return false;
}
}
// Add block to the to be replicated list
rw.getSrcNode().addBlockToBeReplicated(block, targets);
DatanodeStorageInfo.incrementBlocksScheduled(targets);
// Move the block-replication into a "pending" state.
// The reason we use 'pending' is so we can retry
// replications that fail after an appropriate amount of time.
pendingReplications.increment(block,
DatanodeStorageInfo.toDatanodeDescriptors(targets));
blockLog.debug("BLOCK* block {} is moved from neededReplications to "
+ "pendingReplications", block);
int numEffectiveReplicas = numReplicas.liveReplicas() + pendingNum;
// remove from neededReplications
if(numEffectiveReplicas + targets.length >= requiredReplication) {
neededReplications.remove(block, priority);
}
return true;
}
/** Choose target for WebHDFS redirection. */
public DatanodeStorageInfo[] chooseTarget4WebHDFS(String src,
DatanodeDescriptor clientnode, Set<Node> excludes, long blocksize) {
return blockplacement.chooseTarget(src, 1, clientnode,
Collections.<DatanodeStorageInfo>emptyList(), false, excludes,
blocksize, storagePolicySuite.getDefaultPolicy(), null);
}
/** Choose target for getting additional datanodes for an existing pipeline. */
public DatanodeStorageInfo[] chooseTarget4AdditionalDatanode(String src,
int numAdditionalNodes,
Node clientnode,
List<DatanodeStorageInfo> chosen,
Set<Node> excludes,
long blocksize,
byte storagePolicyID) {
final BlockStoragePolicy storagePolicy = storagePolicySuite.getPolicy(storagePolicyID);
return blockplacement.chooseTarget(src, numAdditionalNodes, clientnode,
chosen, true, excludes, blocksize, storagePolicy, null);
}
/**
* Choose target datanodes for creating a new block.
*
* @throws IOException
* if the number of targets < minimum replication.
* @see BlockPlacementPolicy#chooseTarget(String, int, Node,
* Set, long, List, BlockStoragePolicy)
*/
public DatanodeStorageInfo[] chooseTarget4NewBlock(final String src,
final int numOfReplicas, final Node client,
final Set<Node> excludedNodes,
final long blocksize,
final List<String> favoredNodes,
final byte storagePolicyID,
final EnumSet<AddBlockFlag> flags) throws IOException {
List<DatanodeDescriptor> favoredDatanodeDescriptors =
getDatanodeDescriptors(favoredNodes);
final BlockStoragePolicy storagePolicy = storagePolicySuite.getPolicy(storagePolicyID);
final DatanodeStorageInfo[] targets = blockplacement.chooseTarget(src,
numOfReplicas, client, excludedNodes, blocksize,
favoredDatanodeDescriptors, storagePolicy, flags);
if (targets.length < minReplication) {
throw new IOException("File " + src + " could only be replicated to "
+ targets.length + " nodes instead of minReplication (="
+ minReplication + "). There are "
+ getDatanodeManager().getNetworkTopology().getNumOfLeaves()
+ " datanode(s) running and "
+ (excludedNodes == null? "no": excludedNodes.size())
+ " node(s) are excluded in this operation.");
}
return targets;
}
/**
* Get list of datanode descriptors for given list of nodes. Nodes are
* hostaddress:port or just hostaddress.
*/
List<DatanodeDescriptor> getDatanodeDescriptors(List<String> nodes) {
List<DatanodeDescriptor> datanodeDescriptors = null;
if (nodes != null) {
datanodeDescriptors = new ArrayList<DatanodeDescriptor>(nodes.size());
for (int i = 0; i < nodes.size(); i++) {
DatanodeDescriptor node = datanodeManager.getDatanodeDescriptor(nodes.get(i));
if (node != null) {
datanodeDescriptors.add(node);
}
}
}
return datanodeDescriptors;
}
/**
* Parse the data-nodes the block belongs to and choose one,
* which will be the replication source.
*
* We prefer nodes that are in DECOMMISSION_INPROGRESS state to other nodes
* since the former do not have write traffic and hence are less busy.
* We do not use already decommissioned nodes as a source, unless there no
* other choice.
* Otherwise we choose a random node among those that did not reach their
* replication limits. However, if the replication is of the highest priority
* and all nodes have reached their replication limits, we will choose a
* random node despite the replication limit.
*
* In addition form a list of all nodes containing the block
* and calculate its replication numbers.
*
* @param block Block for which a replication source is needed
* @param containingNodes List to be populated with nodes found to contain the
* given block
* @param nodesContainingLiveReplicas List to be populated with nodes found to
* contain live replicas of the given block
* @param numReplicas NumberReplicas instance to be initialized with the
* counts of live, corrupt, excess, and
* decommissioned replicas of the given
* block.
* @param priority integer representing replication priority of the given
* block
* @return the DatanodeDescriptor of the chosen node from which to replicate
* the given block
*/
@VisibleForTesting
DatanodeDescriptor chooseSourceDatanode(Block block,
List<DatanodeDescriptor> containingNodes,
List<DatanodeStorageInfo> nodesContainingLiveReplicas,
NumberReplicas numReplicas,
int priority) {
containingNodes.clear();
nodesContainingLiveReplicas.clear();
DatanodeDescriptor srcNode = null;
DatanodeDescriptor decommissionedSrc = null;
int live = 0;
int readonly = 0;
int decommissioned = 0;
int decommissioning = 0;
int corrupt = 0;
int excess = 0;
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(block);
for(DatanodeStorageInfo storage : blocksMap.getStorages(block)) {
final DatanodeDescriptor node = storage.getDatanodeDescriptor();
LightWeightHashSet<Block> excessBlocks =
excessReplicateMap.get(node.getDatanodeUuid());
int countableReplica = storage.getState() == State.NORMAL ? 1 : 0;
if ((nodesCorrupt != null) && (nodesCorrupt.contains(node)))
corrupt += countableReplica;
else if (node.isDecommissionInProgress()) {
decommissioning += countableReplica;
} else if (node.isDecommissioned()) {
decommissioned += countableReplica;
} else if (excessBlocks != null && excessBlocks.contains(block)) {
excess += countableReplica;
} else {
nodesContainingLiveReplicas.add(storage);
live += countableReplica;
}
if (storage.getState() == State.READ_ONLY_SHARED) {
readonly++;
}
containingNodes.add(node);
// Check if this replica is corrupt
// If so, do not select the node as src node
if ((nodesCorrupt != null) && nodesCorrupt.contains(node))
continue;
if(priority != UnderReplicatedBlocks.QUEUE_HIGHEST_PRIORITY
&& !node.isDecommissionInProgress()
&& node.getNumberOfBlocksToBeReplicated() >= maxReplicationStreams)
{
continue; // already reached replication limit
}
if (node.getNumberOfBlocksToBeReplicated() >= replicationStreamsHardLimit)
{
continue;
}
// the block must not be scheduled for removal on srcNode
if(excessBlocks != null && excessBlocks.contains(block))
continue;
// Save the live decommissioned replica in case we need it. Such replicas
// are normally not used for replication, but if nothing else is
// available, one can be selected as a source.
if (node.isDecommissioned()) {
if (decommissionedSrc == null ||
ThreadLocalRandom.current().nextBoolean()) {
decommissionedSrc = node;
}
continue;
}
// We got this far, current node is a reasonable choice
if (srcNode == null) {
srcNode = node;
continue;
}
// switch to a different node randomly
// this to prevent from deterministically selecting the same node even
// if the node failed to replicate the block on previous iterations
if(ThreadLocalRandom.current().nextBoolean())
srcNode = node;
}
if(numReplicas != null)
numReplicas.set(live, readonly, decommissioned, decommissioning, corrupt,
excess, 0);
// Pick a live decommissioned replica, if nothing else is available.
if (live == 0 && srcNode == null && decommissionedSrc != null) {
return decommissionedSrc;
}
return srcNode;
}
/**
* If there were any replication requests that timed out, reap them
* and put them back into the neededReplication queue
*/
private void processPendingReplications() {
BlockInfo[] timedOutItems = pendingReplications.getTimedOutBlocks();
if (timedOutItems != null) {
namesystem.writeLock();
try {
for (int i = 0; i < timedOutItems.length; i++) {
/*
* Use the blockinfo from the blocksmap to be certain we're working
* with the most up-to-date block information (e.g. genstamp).
*/
BlockInfo bi = blocksMap.getStoredBlock(timedOutItems[i]);
if (bi == null) {
continue;
}
NumberReplicas num = countNodes(timedOutItems[i]);
if (isNeededReplication(bi, num.liveReplicas())) {
neededReplications.add(bi, num.liveReplicas(), num.readOnlyReplicas(),
num.decommissionedAndDecommissioning(), getReplication(bi));
}
}
} finally {
namesystem.writeUnlock();
}
/* If we know the target datanodes where the replication timedout,
* we could invoke decBlocksScheduled() on it. Its ok for now.
*/
}
}
public long requestBlockReportLeaseId(DatanodeRegistration nodeReg) {
assert namesystem.hasReadLock();
DatanodeDescriptor node = null;
try {
node = datanodeManager.getDatanode(nodeReg);
} catch (UnregisteredNodeException e) {
LOG.warn("Unregistered datanode {}", nodeReg);
return 0;
}
if (node == null) {
LOG.warn("Failed to find datanode {}", nodeReg);
return 0;
}
// Request a new block report lease. The BlockReportLeaseManager has
// its own internal locking.
long leaseId = blockReportLeaseManager.requestLease(node);
BlockManagerFaultInjector.getInstance().
requestBlockReportLease(node, leaseId);
return leaseId;
}
/**
* StatefulBlockInfo is used to build the "toUC" list, which is a list of
* updates to the information about under-construction blocks.
* Besides the block in question, it provides the ReplicaState
* reported by the datanode in the block report.
*/
static class StatefulBlockInfo {
final BlockInfo storedBlock;
final Block reportedBlock;
final ReplicaState reportedState;
StatefulBlockInfo(BlockInfo storedBlock,
Block reportedBlock, ReplicaState reportedState) {
Preconditions.checkArgument(!storedBlock.isComplete());
this.storedBlock = storedBlock;
this.reportedBlock = reportedBlock;
this.reportedState = reportedState;
}
}
/**
* The given storage is reporting all its blocks.
* Update the (storage-->block list) and (block-->storage list) maps.
*
* @return true if all known storages of the given DN have finished reporting.
* @throws IOException
*/
public boolean processReport(final DatanodeID nodeID,
final DatanodeStorage storage,
final BlockListAsLongs newReport,
BlockReportContext context) throws IOException {
namesystem.writeLock();
final long startTime = Time.monotonicNow(); //after acquiring write lock
final long endTime;
DatanodeDescriptor node;
Collection<Block> invalidatedBlocks = Collections.emptyList();
String strBlockReportId =
context != null ? Long.toHexString(context.getReportId()) : "";
try {
node = datanodeManager.getDatanode(nodeID);
if (node == null || !node.isRegistered()) {
throw new IOException(
"ProcessReport from dead or unregistered node: " + nodeID);
}
// To minimize startup time, we discard any second (or later) block reports
// that we receive while still in startup phase.
DatanodeStorageInfo storageInfo = node.getStorageInfo(storage.getStorageID());
if (storageInfo == null) {
// We handle this for backwards compatibility.
storageInfo = node.updateStorage(storage);
}
if (namesystem.isInStartupSafeMode()
&& storageInfo.getBlockReportCount() > 0) {
blockLog.info("BLOCK* processReport 0x{}: "
+ "discarded non-initial block report from {}"
+ " because namenode still in startup phase",
strBlockReportId, nodeID);
blockReportLeaseManager.removeLease(node);
return !node.hasStaleStorages();
}
if (context != null) {
if (!blockReportLeaseManager.checkLease(node, startTime,
context.getLeaseId())) {
return false;
}
}
if (storageInfo.getBlockReportCount() == 0) {
// The first block report can be processed a lot more efficiently than
// ordinary block reports. This shortens restart times.
blockLog.info("BLOCK* processReport 0x{}: Processing first "
+ "storage report for {} from datanode {}",
strBlockReportId,
storageInfo.getStorageID(),
nodeID.getDatanodeUuid());
processFirstBlockReport(storageInfo, newReport);
} else {
invalidatedBlocks = processReport(storageInfo, newReport, context);
}
storageInfo.receivedBlockReport();
} finally {
endTime = Time.monotonicNow();
namesystem.writeUnlock();
}
for (Block b : invalidatedBlocks) {
blockLog.debug("BLOCK* processReport 0x{}: {} on node {} size {} does not"
+ " belong to any file", strBlockReportId, b, node, b.getNumBytes());
}
// Log the block report processing stats from Namenode perspective
final NameNodeMetrics metrics = NameNode.getNameNodeMetrics();
if (metrics != null) {
metrics.addBlockReport((int) (endTime - startTime));
}
blockLog.info("BLOCK* processReport 0x{}: from storage {} node {}, " +
"blocks: {}, hasStaleStorage: {}, processing time: {} msecs, " +
"invalidatedBlocks: {}", strBlockReportId, storage.getStorageID(),
nodeID, newReport.getNumberOfBlocks(),
node.hasStaleStorages(), (endTime - startTime),
invalidatedBlocks.size());
return !node.hasStaleStorages();
}
public void removeBRLeaseIfNeeded(final DatanodeID nodeID,
final BlockReportContext context) throws IOException {
namesystem.writeLock();
DatanodeDescriptor node;
try {
node = datanodeManager.getDatanode(nodeID);
if (context != null) {
if (context.getTotalRpcs() == context.getCurRpc() + 1) {
long leaseId = this.getBlockReportLeaseManager().removeLease(node);
BlockManagerFaultInjector.getInstance().
removeBlockReportLease(node, leaseId);
}
LOG.debug("Processing RPC with index {} out of total {} RPCs in "
+ "processReport 0x{}", context.getCurRpc(),
context.getTotalRpcs(), Long.toHexString(context.getReportId()));
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Rescan the list of blocks which were previously postponed.
*/
void rescanPostponedMisreplicatedBlocks() {
if (getPostponedMisreplicatedBlocksCount() == 0) {
return;
}
namesystem.writeLock();
long startTime = Time.monotonicNow();
long startSize = postponedMisreplicatedBlocks.size();
try {
Iterator<Block> it = postponedMisreplicatedBlocks.iterator();
for (int i=0; i < blocksPerPostpondedRescan && it.hasNext(); i++) {
Block b = it.next();
it.remove();
BlockInfo bi = blocksMap.getStoredBlock(b);
if (bi == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("BLOCK* rescanPostponedMisreplicatedBlocks: " +
"Postponed mis-replicated block " + b + " no longer found " +
"in block map.");
}
continue;
}
MisReplicationResult res = processMisReplicatedBlock(bi);
if (LOG.isDebugEnabled()) {
LOG.debug("BLOCK* rescanPostponedMisreplicatedBlocks: " +
"Re-scanned block " + b + ", result is " + res);
}
if (res == MisReplicationResult.POSTPONE) {
rescannedMisreplicatedBlocks.add(b);
}
}
} finally {
postponedMisreplicatedBlocks.addAll(rescannedMisreplicatedBlocks);
rescannedMisreplicatedBlocks.clear();
long endSize = postponedMisreplicatedBlocks.size();
namesystem.writeUnlock();
LOG.info("Rescan of postponedMisreplicatedBlocks completed in " +
(Time.monotonicNow() - startTime) + " msecs. " +
endSize + " blocks are left. " +
(startSize - endSize) + " blocks were removed.");
}
}
private Collection<Block> processReport(
final DatanodeStorageInfo storageInfo,
final BlockListAsLongs report,
BlockReportContext context) throws IOException {
// Normal case:
// Modify the (block-->datanode) map, according to the difference
// between the old and new block report.
//
Collection<BlockInfo> toAdd = new LinkedList<BlockInfo>();
Collection<Block> toRemove = new TreeSet<Block>();
Collection<Block> toInvalidate = new LinkedList<Block>();
Collection<BlockToMarkCorrupt> toCorrupt = new LinkedList<BlockToMarkCorrupt>();
Collection<StatefulBlockInfo> toUC = new LinkedList<StatefulBlockInfo>();
reportDiff(storageInfo, report,
toAdd, toRemove, toInvalidate, toCorrupt, toUC);
String strBlockReportId = "";
if (context != null) {
strBlockReportId = Long.toHexString(context.getReportId());
}
DatanodeDescriptor node = storageInfo.getDatanodeDescriptor();
// Process the blocks on each queue
for (StatefulBlockInfo b : toUC) {
addStoredBlockUnderConstruction(b, storageInfo);
}
for (Block b : toRemove) {
removeStoredBlock(b, node);
}
int numBlocksLogged = 0;
for (BlockInfo b : toAdd) {
addStoredBlock(b, storageInfo, null, numBlocksLogged < maxNumBlocksToLog);
numBlocksLogged++;
}
if (numBlocksLogged > maxNumBlocksToLog) {
blockLog.info("BLOCK* processReport 0x{}: logged info for {} of {} " +
"reported.", strBlockReportId, maxNumBlocksToLog, numBlocksLogged);
}
for (Block b : toInvalidate) {
addToInvalidates(b, node);
}
for (BlockToMarkCorrupt b : toCorrupt) {
markBlockAsCorrupt(b, storageInfo, node);
}
return toInvalidate;
}
/**
* Mark block replicas as corrupt except those on the storages in
* newStorages list.
*/
public void markBlockReplicasAsCorrupt(BlockInfo block,
long oldGenerationStamp, long oldNumBytes,
DatanodeStorageInfo[] newStorages) throws IOException {
assert namesystem.hasWriteLock();
BlockToMarkCorrupt b = null;
if (block.getGenerationStamp() != oldGenerationStamp) {
b = new BlockToMarkCorrupt(block, oldGenerationStamp,
"genstamp does not match " + oldGenerationStamp
+ " : " + block.getGenerationStamp(), Reason.GENSTAMP_MISMATCH);
} else if (block.getNumBytes() != oldNumBytes) {
b = new BlockToMarkCorrupt(block,
"length does not match " + oldNumBytes
+ " : " + block.getNumBytes(), Reason.SIZE_MISMATCH);
} else {
return;
}
for (DatanodeStorageInfo storage : getStorages(block)) {
boolean isCorrupt = true;
if (newStorages != null) {
for (DatanodeStorageInfo newStorage : newStorages) {
if (newStorage!= null && storage.equals(newStorage)) {
isCorrupt = false;
break;
}
}
}
if (isCorrupt) {
blockLog.debug("BLOCK* markBlockReplicasAsCorrupt: mark block replica" +
" {} on {} as corrupt because the dn is not in the new committed " +
"storage list.", b, storage.getDatanodeDescriptor());
markBlockAsCorrupt(b, storage, storage.getDatanodeDescriptor());
}
}
}
/**
* processFirstBlockReport is intended only for processing "initial" block
* reports, the first block report received from a DN after it registers.
* It just adds all the valid replicas to the datanode, without calculating
* a toRemove list (since there won't be any). It also silently discards
* any invalid blocks, thereby deferring their processing until
* the next block report.
* @param storageInfo - DatanodeStorageInfo that sent the report
* @param report - the initial block report, to be processed
* @throws IOException
*/
private void processFirstBlockReport(
final DatanodeStorageInfo storageInfo,
final BlockListAsLongs report) throws IOException {
if (report == null) return;
assert (namesystem.hasWriteLock());
assert (storageInfo.getBlockReportCount() == 0);
for (BlockReportReplica iblk : report) {
ReplicaState reportedState = iblk.getState();
if (LOG.isDebugEnabled()) {
LOG.debug("Initial report of block " + iblk.getBlockName()
+ " on " + storageInfo.getDatanodeDescriptor() + " size " +
iblk.getNumBytes() + " replicaState = " + reportedState);
}
if (shouldPostponeBlocksFromFuture &&
namesystem.isGenStampInFuture(iblk)) {
queueReportedBlock(storageInfo, iblk, reportedState,
QUEUE_REASON_FUTURE_GENSTAMP);
continue;
}
BlockInfo storedBlock = getStoredBlock(iblk);
// If block does not belong to any file, we check if it violates
// an integrity assumption of Name node
if (storedBlock == null) {
if (namesystem.isInStartupSafeMode()
&& !shouldPostponeBlocksFromFuture
&& !inRollBack
&& namesystem.isGenStampInFuture(iblk)) {
numberOfBytesInFutureBlocks.addAndGet(iblk.getBytesOnDisk());
}
continue;
}
// If block is corrupt, mark it and continue to next block.
BlockUCState ucState = storedBlock.getBlockUCState();
BlockToMarkCorrupt c = checkReplicaCorrupt(
iblk, reportedState, storedBlock, ucState,
storageInfo.getDatanodeDescriptor());
if (c != null) {
if (shouldPostponeBlocksFromFuture) {
// In the Standby, we may receive a block report for a file that we
// just have an out-of-date gen-stamp or state for, for example.
queueReportedBlock(storageInfo, iblk, reportedState,
QUEUE_REASON_CORRUPT_STATE);
} else {
markBlockAsCorrupt(c, storageInfo, storageInfo.getDatanodeDescriptor());
}
continue;
}
// If block is under construction, add this replica to its list
if (isBlockUnderConstruction(storedBlock, ucState, reportedState)) {
storedBlock.getUnderConstructionFeature()
.addReplicaIfNotPresent(storageInfo, iblk, reportedState);
// OpenFileBlocks only inside snapshots also will be added to safemode
// threshold. So we need to update such blocks to safemode
// refer HDFS-5283
if (namesystem.isInSnapshot(storedBlock.getBlockCollectionId())) {
int numOfReplicas = storedBlock.getUnderConstructionFeature()
.getNumExpectedLocations();
namesystem.incrementSafeBlockCount(numOfReplicas);
}
//and fall through to next clause
}
//add replica if appropriate
if (reportedState == ReplicaState.FINALIZED) {
addStoredBlockImmediate(storedBlock, storageInfo);
}
}
}
private void reportDiff(DatanodeStorageInfo storageInfo,
BlockListAsLongs newReport,
Collection<BlockInfo> toAdd, // add to DatanodeDescriptor
Collection<Block> toRemove, // remove from DatanodeDescriptor
Collection<Block> toInvalidate, // should be removed from DN
Collection<BlockToMarkCorrupt> toCorrupt, // add to corrupt replicas list
Collection<StatefulBlockInfo> toUC) { // add to under-construction list
// place a delimiter in the list which separates blocks
// that have been reported from those that have not
BlockInfo delimiter = new BlockInfoContiguous(new Block(), (short) 1);
AddBlockResult result = storageInfo.addBlock(delimiter);
assert result == AddBlockResult.ADDED
: "Delimiting block cannot be present in the node";
int headIndex = 0; //currently the delimiter is in the head of the list
int curIndex;
if (newReport == null) {
newReport = BlockListAsLongs.EMPTY;
}
// scan the report and process newly reported blocks
for (BlockReportReplica iblk : newReport) {
ReplicaState iState = iblk.getState();
BlockInfo storedBlock = processReportedBlock(storageInfo,
iblk, iState, toAdd, toInvalidate, toCorrupt, toUC);
// move block to the head of the list
if (storedBlock != null &&
(curIndex = storedBlock.findStorageInfo(storageInfo)) >= 0) {
headIndex = storageInfo.moveBlockToHead(storedBlock, curIndex, headIndex);
}
}
// collect blocks that have not been reported
// all of them are next to the delimiter
Iterator<BlockInfo> it =
storageInfo.new BlockIterator(delimiter.getNext(0));
while(it.hasNext())
toRemove.add(it.next());
storageInfo.removeBlock(delimiter);
}
/**
* Process a block replica reported by the data-node.
* No side effects except adding to the passed-in Collections.
*
* <ol>
* <li>If the block is not known to the system (not in blocksMap) then the
* data-node should be notified to invalidate this block.</li>
* <li>If the reported replica is valid that is has the same generation stamp
* and length as recorded on the name-node, then the replica location should
* be added to the name-node.</li>
* <li>If the reported replica is not valid, then it is marked as corrupt,
* which triggers replication of the existing valid replicas.
* Corrupt replicas are removed from the system when the block
* is fully replicated.</li>
* <li>If the reported replica is for a block currently marked "under
* construction" in the NN, then it should be added to the
* BlockUnderConstructionFeature's list of replicas.</li>
* </ol>
*
* @param storageInfo DatanodeStorageInfo that sent the report.
* @param block reported block replica
* @param reportedState reported replica state
* @param toAdd add to DatanodeDescriptor
* @param toInvalidate missing blocks (not in the blocks map)
* should be removed from the data-node
* @param toCorrupt replicas with unexpected length or generation stamp;
* add to corrupt replicas
* @param toUC replicas of blocks currently under construction
* @return the up-to-date stored block, if it should be kept.
* Otherwise, null.
*/
private BlockInfo processReportedBlock(
final DatanodeStorageInfo storageInfo,
final Block block, final ReplicaState reportedState,
final Collection<BlockInfo> toAdd,
final Collection<Block> toInvalidate,
final Collection<BlockToMarkCorrupt> toCorrupt,
final Collection<StatefulBlockInfo> toUC) {
DatanodeDescriptor dn = storageInfo.getDatanodeDescriptor();
if(LOG.isDebugEnabled()) {
LOG.debug("Reported block " + block
+ " on " + dn + " size " + block.getNumBytes()
+ " replicaState = " + reportedState);
}
if (shouldPostponeBlocksFromFuture &&
namesystem.isGenStampInFuture(block)) {
queueReportedBlock(storageInfo, block, reportedState,
QUEUE_REASON_FUTURE_GENSTAMP);
return null;
}
// find block by blockId
BlockInfo storedBlock = blocksMap.getStoredBlock(block);
if(storedBlock == null) {
// If blocksMap does not contain reported block id,
// the replica should be removed from the data-node.
toInvalidate.add(new Block(block));
return null;
}
BlockUCState ucState = storedBlock.getBlockUCState();
// Block is on the NN
if(LOG.isDebugEnabled()) {
LOG.debug("In memory blockUCState = " + ucState);
}
// Ignore replicas already scheduled to be removed from the DN
if(invalidateBlocks.contains(dn, block)) {
return storedBlock;
}
BlockToMarkCorrupt c = checkReplicaCorrupt(
block, reportedState, storedBlock, ucState, dn);
if (c != null) {
if (shouldPostponeBlocksFromFuture) {
// If the block is an out-of-date generation stamp or state,
// but we're the standby, we shouldn't treat it as corrupt,
// but instead just queue it for later processing.
// TODO: Pretty confident this should be s/storedBlock/block below,
// since we should be postponing the info of the reported block, not
// the stored block. See HDFS-6289 for more context.
queueReportedBlock(storageInfo, storedBlock, reportedState,
QUEUE_REASON_CORRUPT_STATE);
} else {
toCorrupt.add(c);
}
return storedBlock;
}
if (isBlockUnderConstruction(storedBlock, ucState, reportedState)) {
toUC.add(new StatefulBlockInfo(storedBlock,
new Block(block), reportedState));
return storedBlock;
}
// Add replica if appropriate. If the replica was previously corrupt
// but now okay, it might need to be updated.
if (reportedState == ReplicaState.FINALIZED
&& (storedBlock.findStorageInfo(storageInfo) == -1 ||
corruptReplicas.isReplicaCorrupt(storedBlock, dn))) {
toAdd.add(storedBlock);
}
return storedBlock;
}
/**
* Queue the given reported block for later processing in the
* standby node. @see PendingDataNodeMessages.
* @param reason a textual reason to report in the debug logs
*/
private void queueReportedBlock(DatanodeStorageInfo storageInfo, Block block,
ReplicaState reportedState, String reason) {
assert shouldPostponeBlocksFromFuture;
if (LOG.isDebugEnabled()) {
LOG.debug("Queueing reported block " + block +
" in state " + reportedState +
" from datanode " + storageInfo.getDatanodeDescriptor() +
" for later processing because " + reason + ".");
}
pendingDNMessages.enqueueReportedBlock(storageInfo, block, reportedState);
}
/**
* Try to process any messages that were previously queued for the given
* block. This is called from FSEditLogLoader whenever a block's state
* in the namespace has changed or a new block has been created.
*/
public void processQueuedMessagesForBlock(Block b) throws IOException {
Queue<ReportedBlockInfo> queue = pendingDNMessages.takeBlockQueue(b);
if (queue == null) {
// Nothing to re-process
return;
}
processQueuedMessages(queue);
}
private void processQueuedMessages(Iterable<ReportedBlockInfo> rbis)
throws IOException {
for (ReportedBlockInfo rbi : rbis) {
if (LOG.isDebugEnabled()) {
LOG.debug("Processing previouly queued message " + rbi);
}
if (rbi.getReportedState() == null) {
// This is a DELETE_BLOCK request
DatanodeStorageInfo storageInfo = rbi.getStorageInfo();
removeStoredBlock(rbi.getBlock(),
storageInfo.getDatanodeDescriptor());
} else {
processAndHandleReportedBlock(rbi.getStorageInfo(),
rbi.getBlock(), rbi.getReportedState(), null);
}
}
}
/**
* Process any remaining queued datanode messages after entering
* active state. At this point they will not be re-queued since
* we are the definitive master node and thus should be up-to-date
* with the namespace information.
*/
public void processAllPendingDNMessages() throws IOException {
assert !shouldPostponeBlocksFromFuture :
"processAllPendingDNMessages() should be called after disabling " +
"block postponement.";
int count = pendingDNMessages.count();
if (count > 0) {
LOG.info("Processing " + count + " messages from DataNodes " +
"that were previously queued during standby state");
}
processQueuedMessages(pendingDNMessages.takeAll());
assert pendingDNMessages.count() == 0;
}
/**
* The next two methods test the various cases under which we must conclude
* the replica is corrupt, or under construction. These are laid out
* as switch statements, on the theory that it is easier to understand
* the combinatorics of reportedState and ucState that way. It should be
* at least as efficient as boolean expressions.
*
* @return a BlockToMarkCorrupt object, or null if the replica is not corrupt
*/
private BlockToMarkCorrupt checkReplicaCorrupt(
Block reported, ReplicaState reportedState,
BlockInfo storedBlock, BlockUCState ucState,
DatanodeDescriptor dn) {
switch(reportedState) {
case FINALIZED:
switch(ucState) {
case COMPLETE:
case COMMITTED:
if (storedBlock.getGenerationStamp() != reported.getGenerationStamp()) {
final long reportedGS = reported.getGenerationStamp();
return new BlockToMarkCorrupt(storedBlock, reportedGS,
"block is " + ucState + " and reported genstamp " + reportedGS
+ " does not match genstamp in block map "
+ storedBlock.getGenerationStamp(), Reason.GENSTAMP_MISMATCH);
} else if (storedBlock.getNumBytes() != reported.getNumBytes()) {
return new BlockToMarkCorrupt(storedBlock,
"block is " + ucState + " and reported length " +
reported.getNumBytes() + " does not match " +
"length in block map " + storedBlock.getNumBytes(),
Reason.SIZE_MISMATCH);
} else {
return null; // not corrupt
}
case UNDER_CONSTRUCTION:
if (storedBlock.getGenerationStamp() > reported.getGenerationStamp()) {
final long reportedGS = reported.getGenerationStamp();
return new BlockToMarkCorrupt(storedBlock, reportedGS, "block is "
+ ucState + " and reported state " + reportedState
+ ", But reported genstamp " + reportedGS
+ " does not match genstamp in block map "
+ storedBlock.getGenerationStamp(), Reason.GENSTAMP_MISMATCH);
}
return null;
default:
return null;
}
case RBW:
case RWR:
if (!storedBlock.isComplete()) {
return null; // not corrupt
} else if (storedBlock.getGenerationStamp() != reported.getGenerationStamp()) {
final long reportedGS = reported.getGenerationStamp();
return new BlockToMarkCorrupt(storedBlock, reportedGS,
"reported " + reportedState + " replica with genstamp " + reportedGS
+ " does not match COMPLETE block's genstamp in block map "
+ storedBlock.getGenerationStamp(), Reason.GENSTAMP_MISMATCH);
} else { // COMPLETE block, same genstamp
if (reportedState == ReplicaState.RBW) {
// If it's a RBW report for a COMPLETE block, it may just be that
// the block report got a little bit delayed after the pipeline
// closed. So, ignore this report, assuming we will get a
// FINALIZED replica later. See HDFS-2791
LOG.info("Received an RBW replica for " + storedBlock +
" on " + dn + ": ignoring it, since it is " +
"complete with the same genstamp");
return null;
} else {
return new BlockToMarkCorrupt(storedBlock,
"reported replica has invalid state " + reportedState,
Reason.INVALID_STATE);
}
}
case RUR: // should not be reported
case TEMPORARY: // should not be reported
default:
String msg = "Unexpected replica state " + reportedState
+ " for block: " + storedBlock +
" on " + dn + " size " + storedBlock.getNumBytes();
// log here at WARN level since this is really a broken HDFS invariant
LOG.warn(msg);
return new BlockToMarkCorrupt(storedBlock, msg, Reason.INVALID_STATE);
}
}
private boolean isBlockUnderConstruction(BlockInfo storedBlock,
BlockUCState ucState, ReplicaState reportedState) {
switch(reportedState) {
case FINALIZED:
switch(ucState) {
case UNDER_CONSTRUCTION:
case UNDER_RECOVERY:
return true;
default:
return false;
}
case RBW:
case RWR:
return (!storedBlock.isComplete());
case RUR: // should not be reported
case TEMPORARY: // should not be reported
default:
return false;
}
}
void addStoredBlockUnderConstruction(StatefulBlockInfo ucBlock,
DatanodeStorageInfo storageInfo) throws IOException {
BlockInfo block = ucBlock.storedBlock;
block.getUnderConstructionFeature().addReplicaIfNotPresent(
storageInfo, ucBlock.reportedBlock, ucBlock.reportedState);
if (ucBlock.reportedState == ReplicaState.FINALIZED &&
(block.findStorageInfo(storageInfo) < 0)) {
addStoredBlock(block, storageInfo, null, true);
}
}
/**
* Faster version of {@link #addStoredBlock},
* intended for use with initial block report at startup. If not in startup
* safe mode, will call standard addStoredBlock(). Assumes this method is
* called "immediately" so there is no need to refresh the storedBlock from
* blocksMap. Doesn't handle underReplication/overReplication, or worry about
* pendingReplications or corruptReplicas, because it's in startup safe mode.
* Doesn't log every block, because there are typically millions of them.
*
* @throws IOException
*/
private void addStoredBlockImmediate(BlockInfo storedBlock,
DatanodeStorageInfo storageInfo)
throws IOException {
assert (storedBlock != null && namesystem.hasWriteLock());
if (!namesystem.isInStartupSafeMode()
|| isPopulatingReplQueues()) {
addStoredBlock(storedBlock, storageInfo, null, false);
return;
}
// just add it
AddBlockResult result = storageInfo.addBlock(storedBlock);
// Now check for completion of blocks and safe block count
int numCurrentReplica = countLiveNodes(storedBlock);
if (storedBlock.getBlockUCState() == BlockUCState.COMMITTED
&& numCurrentReplica >= minReplication) {
completeBlock(storedBlock, null, false);
} else if (storedBlock.isComplete() && result == AddBlockResult.ADDED) {
// check whether safe replication is reached for the block
// only complete blocks are counted towards that.
// In the case that the block just became complete above, completeBlock()
// handles the safe block count maintenance.
namesystem.incrementSafeBlockCount(numCurrentReplica);
}
}
/**
* Modify (block-->datanode) map. Remove block from set of
* needed replications if this takes care of the problem.
* @return the block that is stored in blockMap.
*/
private Block addStoredBlock(final BlockInfo block,
DatanodeStorageInfo storageInfo,
DatanodeDescriptor delNodeHint,
boolean logEveryBlock)
throws IOException {
assert block != null && namesystem.hasWriteLock();
BlockInfo storedBlock;
DatanodeDescriptor node = storageInfo.getDatanodeDescriptor();
if (!block.isComplete()) {
//refresh our copy in case the block got completed in another thread
storedBlock = blocksMap.getStoredBlock(block);
} else {
storedBlock = block;
}
if (storedBlock == null || storedBlock.isDeleted()) {
// If this block does not belong to anyfile, then we are done.
blockLog.debug("BLOCK* addStoredBlock: {} on {} size {} but it does not" +
" belong to any file", block, node, block.getNumBytes());
// we could add this block to invalidate set of this datanode.
// it will happen in next block report otherwise.
return block;
}
// add block to the datanode
AddBlockResult result = storageInfo.addBlock(storedBlock);
int curReplicaDelta;
if (result == AddBlockResult.ADDED) {
curReplicaDelta = (node.isDecommissioned()) ? 0 : 1;
if (logEveryBlock) {
blockLog.debug("BLOCK* addStoredBlock: {} is added to {} (size={})",
node, storedBlock, storedBlock.getNumBytes());
}
} else if (result == AddBlockResult.REPLACED) {
curReplicaDelta = 0;
blockLog.warn("BLOCK* addStoredBlock: block {} moved to storageType " +
"{} on node {}", storedBlock, storageInfo.getStorageType(), node);
} else {
// if the same block is added again and the replica was corrupt
// previously because of a wrong gen stamp, remove it from the
// corrupt block list.
corruptReplicas.removeFromCorruptReplicasMap(block, node,
Reason.GENSTAMP_MISMATCH);
curReplicaDelta = 0;
blockLog.debug("BLOCK* addStoredBlock: Redundant addStoredBlock request"
+ " received for {} on node {} size {}", storedBlock, node,
storedBlock.getNumBytes());
}
// Now check for completion of blocks and safe block count
NumberReplicas num = countNodes(storedBlock);
int numLiveReplicas = num.liveReplicas();
int numCurrentReplica = numLiveReplicas
+ pendingReplications.getNumReplicas(storedBlock);
if(storedBlock.getBlockUCState() == BlockUCState.COMMITTED &&
numLiveReplicas >= minReplication) {
addExpectedReplicasToPending(storedBlock);
completeBlock(storedBlock, null, false);
} else if (storedBlock.isComplete() && result == AddBlockResult.ADDED) {
// check whether safe replication is reached for the block
// only complete blocks are counted towards that
// Is no-op if not in safe mode.
// In the case that the block just became complete above, completeBlock()
// handles the safe block count maintenance.
namesystem.incrementSafeBlockCount(numCurrentReplica);
}
// if block is still under construction, then done for now
if (!storedBlock.isCompleteOrCommitted()) {
return storedBlock;
}
// do not try to handle over/under-replicated blocks during first safe mode
if (!isPopulatingReplQueues()) {
return storedBlock;
}
// handle underReplication/overReplication
short fileReplication = getExpectedReplicaNum(storedBlock);
if (!isNeededReplication(storedBlock, numCurrentReplica)) {
neededReplications.remove(storedBlock, numCurrentReplica,
num.readOnlyReplicas(),
num.decommissionedAndDecommissioning(), fileReplication);
} else {
updateNeededReplications(storedBlock, curReplicaDelta, 0);
}
if (numCurrentReplica > fileReplication) {
processOverReplicatedBlock(storedBlock, fileReplication, node, delNodeHint);
}
// If the file replication has reached desired value
// we can remove any corrupt replicas the block may have
int corruptReplicasCount = corruptReplicas.numCorruptReplicas(storedBlock);
int numCorruptNodes = num.corruptReplicas();
if (numCorruptNodes != corruptReplicasCount) {
LOG.warn("Inconsistent number of corrupt replicas for " +
storedBlock + "blockMap has " + numCorruptNodes +
" but corrupt replicas map has " + corruptReplicasCount);
}
if ((corruptReplicasCount > 0) && (numLiveReplicas >= fileReplication))
invalidateCorruptReplicas(storedBlock);
return storedBlock;
}
/**
* Invalidate corrupt replicas.
* <p>
* This will remove the replicas from the block's location list,
* add them to {@link #invalidateBlocks} so that they could be further
* deleted from the respective data-nodes,
* and remove the block from corruptReplicasMap.
* <p>
* This method should be called when the block has sufficient
* number of live replicas.
*
* @param blk Block whose corrupt replicas need to be invalidated
*/
private void invalidateCorruptReplicas(BlockInfo blk) {
Collection<DatanodeDescriptor> nodes = corruptReplicas.getNodes(blk);
boolean removedFromBlocksMap = true;
if (nodes == null)
return;
// make a copy of the array of nodes in order to avoid
// ConcurrentModificationException, when the block is removed from the node
DatanodeDescriptor[] nodesCopy = nodes.toArray(new DatanodeDescriptor[0]);
for (DatanodeDescriptor node : nodesCopy) {
try {
if (!invalidateBlock(new BlockToMarkCorrupt(blk, null,
Reason.ANY), node)) {
removedFromBlocksMap = false;
}
} catch (IOException e) {
blockLog.debug("invalidateCorruptReplicas error in deleting bad block"
+ " {} on {}", blk, node, e);
removedFromBlocksMap = false;
}
}
// Remove the block from corruptReplicasMap
if (removedFromBlocksMap) {
corruptReplicas.removeFromCorruptReplicasMap(blk);
}
}
/**
* For each block in the name-node verify whether it belongs to any file,
* over or under replicated. Place it into the respective queue.
*/
public void processMisReplicatedBlocks() {
assert namesystem.hasWriteLock();
stopReplicationInitializer();
neededReplications.clear();
replicationQueuesInitializer = new Daemon() {
@Override
public void run() {
try {
processMisReplicatesAsync();
} catch (InterruptedException ie) {
LOG.info("Interrupted while processing replication queues.");
} catch (Exception e) {
LOG.error("Error while processing replication queues async", e);
}
}
};
replicationQueuesInitializer.setName("Replication Queue Initializer");
replicationQueuesInitializer.start();
}
/*
* Stop the ongoing initialisation of replication queues
*/
private void stopReplicationInitializer() {
if (replicationQueuesInitializer != null) {
replicationQueuesInitializer.interrupt();
try {
replicationQueuesInitializer.join();
} catch (final InterruptedException e) {
LOG.warn("Interrupted while waiting for replicationQueueInitializer. Returning..");
return;
} finally {
replicationQueuesInitializer = null;
}
}
}
/*
* Since the BlocksMapGset does not throw the ConcurrentModificationException
* and supports further iteration after modification to list, there is a
* chance of missing the newly added block while iterating. Since every
* addition to blocksMap will check for mis-replication, missing mis-replication
* check for new blocks will not be a problem.
*/
private void processMisReplicatesAsync() throws InterruptedException {
long nrInvalid = 0, nrOverReplicated = 0;
long nrUnderReplicated = 0, nrPostponed = 0, nrUnderConstruction = 0;
long startTimeMisReplicatedScan = Time.monotonicNow();
Iterator<BlockInfo> blocksItr = blocksMap.getBlocks().iterator();
long totalBlocks = blocksMap.size();
replicationQueuesInitProgress = 0;
long totalProcessed = 0;
long sleepDuration =
Math.max(1, Math.min(numBlocksPerIteration/1000, 10000));
while (namesystem.isRunning() && !Thread.currentThread().isInterrupted()) {
int processed = 0;
namesystem.writeLockInterruptibly();
try {
while (processed < numBlocksPerIteration && blocksItr.hasNext()) {
BlockInfo block = blocksItr.next();
MisReplicationResult res = processMisReplicatedBlock(block);
switch (res) {
case UNDER_REPLICATED:
LOG.trace("under replicated block {}: {}", block, res);
nrUnderReplicated++;
break;
case OVER_REPLICATED:
LOG.trace("over replicated block {}: {}", block, res);
nrOverReplicated++;
break;
case INVALID:
LOG.trace("invalid block {}: {}", block, res);
nrInvalid++;
break;
case POSTPONE:
LOG.trace("postpone block {}: {}", block, res);
nrPostponed++;
postponeBlock(block);
break;
case UNDER_CONSTRUCTION:
LOG.trace("under construction block {}: {}", block, res);
nrUnderConstruction++;
break;
case OK:
break;
default:
throw new AssertionError("Invalid enum value: " + res);
}
processed++;
}
totalProcessed += processed;
// there is a possibility that if any of the blocks deleted/added during
// initialisation, then progress might be different.
replicationQueuesInitProgress = Math.min((double) totalProcessed
/ totalBlocks, 1.0);
if (!blocksItr.hasNext()) {
LOG.info("Total number of blocks = " + blocksMap.size());
LOG.info("Number of invalid blocks = " + nrInvalid);
LOG.info("Number of under-replicated blocks = " + nrUnderReplicated);
LOG.info("Number of over-replicated blocks = " + nrOverReplicated
+ ((nrPostponed > 0) ? (" (" + nrPostponed + " postponed)") : ""));
LOG.info("Number of blocks being written = " + nrUnderConstruction);
NameNode.stateChangeLog
.info("STATE* Replication Queue initialization "
+ "scan for invalid, over- and under-replicated blocks "
+ "completed in "
+ (Time.monotonicNow() - startTimeMisReplicatedScan)
+ " msec");
break;
}
} finally {
namesystem.writeUnlock();
// Make sure it is out of the write lock for sufficiently long time.
Thread.sleep(sleepDuration);
}
}
if (Thread.currentThread().isInterrupted()) {
LOG.info("Interrupted while processing replication queues.");
}
}
/**
* Get the progress of the Replication queues initialisation
*
* @return Returns values between 0 and 1 for the progress.
*/
public double getReplicationQueuesInitProgress() {
return replicationQueuesInitProgress;
}
/**
* Process a single possibly misreplicated block. This adds it to the
* appropriate queues if necessary, and returns a result code indicating
* what happened with it.
*/
private MisReplicationResult processMisReplicatedBlock(BlockInfo block) {
if (block.isDeleted()) {
// block does not belong to any file
addToInvalidates(block);
return MisReplicationResult.INVALID;
}
if (!block.isComplete()) {
// Incomplete blocks are never considered mis-replicated --
// they'll be reached when they are completed or recovered.
return MisReplicationResult.UNDER_CONSTRUCTION;
}
// calculate current replication
short expectedReplication = getExpectedReplicaNum(block);
NumberReplicas num = countNodes(block);
int numCurrentReplica = num.liveReplicas();
// add to under-replicated queue if need to be
if (isNeededReplication(block, numCurrentReplica)) {
if (neededReplications.add(block, numCurrentReplica, num.readOnlyReplicas(),
num.decommissionedAndDecommissioning(), expectedReplication)) {
return MisReplicationResult.UNDER_REPLICATED;
}
}
if (numCurrentReplica > expectedReplication) {
if (num.replicasOnStaleNodes() > 0) {
// If any of the replicas of this block are on nodes that are
// considered "stale", then these replicas may in fact have
// already been deleted. So, we cannot safely act on the
// over-replication until a later point in time, when
// the "stale" nodes have block reported.
return MisReplicationResult.POSTPONE;
}
// over-replicated block
processOverReplicatedBlock(block, expectedReplication, null, null);
return MisReplicationResult.OVER_REPLICATED;
}
return MisReplicationResult.OK;
}
/** Set replication for the blocks. */
public void setReplication(
final short oldRepl, final short newRepl, final BlockInfo b) {
if (newRepl == oldRepl) {
return;
}
// update needReplication priority queues
b.setReplication(newRepl);
updateNeededReplications(b, 0, newRepl - oldRepl);
if (oldRepl > newRepl) {
processOverReplicatedBlock(b, newRepl, null, null);
}
}
/**
* Find how many of the containing nodes are "extra", if any.
* If there are any extras, call chooseExcessReplicates() to
* mark them in the excessReplicateMap.
*/
private void processOverReplicatedBlock(final BlockInfo block,
final short replication, final DatanodeDescriptor addedNode,
DatanodeDescriptor delNodeHint) {
assert namesystem.hasWriteLock();
if (addedNode == delNodeHint) {
delNodeHint = null;
}
Collection<DatanodeStorageInfo> nonExcess = new ArrayList<DatanodeStorageInfo>();
Collection<DatanodeDescriptor> corruptNodes = corruptReplicas
.getNodes(block);
for (DatanodeStorageInfo storage : blocksMap.getStorages(block)) {
if (storage.getState() != State.NORMAL) {
continue;
}
final DatanodeDescriptor cur = storage.getDatanodeDescriptor();
if (storage.areBlockContentsStale()) {
LOG.trace("BLOCK* processOverReplicatedBlock: Postponing {}"
+ " since storage {} does not yet have up-to-date information.",
block, storage);
postponeBlock(block);
return;
}
LightWeightHashSet<Block> excessBlocks = excessReplicateMap.get(
cur.getDatanodeUuid());
if (excessBlocks == null || !excessBlocks.contains(block)) {
if (!cur.isDecommissionInProgress() && !cur.isDecommissioned()) {
// exclude corrupt replicas
if (corruptNodes == null || !corruptNodes.contains(cur)) {
nonExcess.add(storage);
}
}
}
}
chooseExcessReplicates(nonExcess, block, replication,
addedNode, delNodeHint);
}
private void chooseExcessReplicates(
final Collection<DatanodeStorageInfo> nonExcess,
BlockInfo storedBlock, short replication,
DatanodeDescriptor addedNode,
DatanodeDescriptor delNodeHint) {
assert namesystem.hasWriteLock();
// first form a rack to datanodes map and
BlockCollection bc = getBlockCollection(storedBlock);
final BlockStoragePolicy storagePolicy = storagePolicySuite.getPolicy(
bc.getStoragePolicyID());
final List<StorageType> excessTypes = storagePolicy.chooseExcess(
replication, DatanodeStorageInfo.toStorageTypes(nonExcess));
List<DatanodeStorageInfo> replicasToDelete = blockplacement
.chooseReplicasToDelete(nonExcess, replication, excessTypes,
addedNode, delNodeHint);
for (DatanodeStorageInfo choosenReplica : replicasToDelete) {
processChosenExcessReplica(nonExcess, choosenReplica, storedBlock);
}
}
private void processChosenExcessReplica(
final Collection<DatanodeStorageInfo> nonExcess,
final DatanodeStorageInfo chosen, BlockInfo storedBlock) {
nonExcess.remove(chosen);
addToExcessReplicate(chosen.getDatanodeDescriptor(), storedBlock);
//
// The 'excessblocks' tracks blocks until we get confirmation
// that the datanode has deleted them; the only way we remove them
// is when we get a "removeBlock" message.
//
// The 'invalidate' list is used to inform the datanode the block
// should be deleted. Items are removed from the invalidate list
// upon giving instructions to the datanodes.
//
addToInvalidates(storedBlock, chosen.getDatanodeDescriptor());
blockLog.debug("BLOCK* chooseExcessReplicates: "
+ "({}, {}) is added to invalidated blocks set", chosen, storedBlock);
}
private void addToExcessReplicate(DatanodeInfo dn, Block block) {
assert namesystem.hasWriteLock();
LightWeightHashSet<Block> excessBlocks = excessReplicateMap.get(
dn.getDatanodeUuid());
if (excessBlocks == null) {
excessBlocks = new LightWeightHashSet<>();
excessReplicateMap.put(dn.getDatanodeUuid(), excessBlocks);
}
if (excessBlocks.add(block)) {
excessBlocksCount.incrementAndGet();
blockLog.debug("BLOCK* addToExcessReplicate: ({}, {}) is added to"
+ " excessReplicateMap", dn, block);
}
}
private void removeStoredBlock(DatanodeStorageInfo storageInfo, Block block,
DatanodeDescriptor node) {
if (shouldPostponeBlocksFromFuture &&
namesystem.isGenStampInFuture(block)) {
queueReportedBlock(storageInfo, block, null,
QUEUE_REASON_FUTURE_GENSTAMP);
return;
}
removeStoredBlock(block, node);
}
/**
* Modify (block-->datanode) map. Possibly generate replication tasks, if the
* removed block is still valid.
*/
public void removeStoredBlock(Block block, DatanodeDescriptor node) {
blockLog.debug("BLOCK* removeStoredBlock: {} from {}", block, node);
assert (namesystem.hasWriteLock());
{
BlockInfo storedBlock = getStoredBlock(block);
if (storedBlock == null || !blocksMap.removeNode(storedBlock, node)) {
blockLog.debug("BLOCK* removeStoredBlock: {} has already been" +
" removed from node {}", block, node);
return;
}
CachedBlock cblock = namesystem.getCacheManager().getCachedBlocks()
.get(new CachedBlock(block.getBlockId(), (short) 0, false));
if (cblock != null) {
boolean removed = false;
removed |= node.getPendingCached().remove(cblock);
removed |= node.getCached().remove(cblock);
removed |= node.getPendingUncached().remove(cblock);
if (removed) {
blockLog.debug("BLOCK* removeStoredBlock: {} removed from caching "
+ "related lists on node {}", block, node);
}
}
//
// It's possible that the block was removed because of a datanode
// failure. If the block is still valid, check if replication is
// necessary. In that case, put block on a possibly-will-
// be-replicated list.
//
if (!storedBlock.isDeleted()) {
namesystem.decrementSafeBlockCount(storedBlock);
updateNeededReplications(storedBlock, -1, 0);
}
//
// We've removed a block from a node, so it's definitely no longer
// in "excess" there.
//
LightWeightHashSet<Block> excessBlocks = excessReplicateMap.get(
node.getDatanodeUuid());
if (excessBlocks != null) {
if (excessBlocks.remove(block)) {
excessBlocksCount.decrementAndGet();
blockLog.debug("BLOCK* removeStoredBlock: {} is removed from " +
"excessBlocks", block);
if (excessBlocks.size() == 0) {
excessReplicateMap.remove(node.getDatanodeUuid());
}
}
}
// Remove the replica from corruptReplicas
corruptReplicas.removeFromCorruptReplicasMap(block, node);
}
}
private void removeStaleReplicas(List<ReplicaUnderConstruction> staleReplicas,
BlockInfo block) {
for (ReplicaUnderConstruction r : staleReplicas) {
removeStoredBlock(block,
r.getExpectedStorageLocation().getDatanodeDescriptor());
NameNode.blockStateChangeLog
.debug("BLOCK* Removing stale replica {}" + " of {}", r,
Block.toString(r));
}
}
/**
* Get all valid locations of the block & add the block to results
* return the length of the added block; 0 if the block is not added
*/
private long addBlock(Block block, List<BlockWithLocations> results) {
final List<DatanodeStorageInfo> locations = getValidLocations(block);
if(locations.size() == 0) {
return 0;
} else {
final String[] datanodeUuids = new String[locations.size()];
final String[] storageIDs = new String[datanodeUuids.length];
final StorageType[] storageTypes = new StorageType[datanodeUuids.length];
for(int i = 0; i < locations.size(); i++) {
final DatanodeStorageInfo s = locations.get(i);
datanodeUuids[i] = s.getDatanodeDescriptor().getDatanodeUuid();
storageIDs[i] = s.getStorageID();
storageTypes[i] = s.getStorageType();
}
results.add(new BlockWithLocations(block, datanodeUuids, storageIDs,
storageTypes));
return block.getNumBytes();
}
}
/**
* The given node is reporting that it received a certain block.
*/
@VisibleForTesting
void addBlock(DatanodeStorageInfo storageInfo, Block block, String delHint)
throws IOException {
DatanodeDescriptor node = storageInfo.getDatanodeDescriptor();
// Decrement number of blocks scheduled to this datanode.
// for a retry request (of DatanodeProtocol#blockReceivedAndDeleted with
// RECEIVED_BLOCK), we currently also decrease the approximate number.
node.decrementBlocksScheduled(storageInfo.getStorageType());
// get the deletion hint node
DatanodeDescriptor delHintNode = null;
if (delHint != null && delHint.length() != 0) {
delHintNode = datanodeManager.getDatanode(delHint);
if (delHintNode == null) {
blockLog.warn("BLOCK* blockReceived: {} is expected to be removed " +
"from an unrecorded node {}", block, delHint);
}
}
//
// Modify the blocks->datanode map and node's map.
//
BlockInfo storedBlock = getStoredBlock(block);
if (storedBlock != null &&
block.getGenerationStamp() == storedBlock.getGenerationStamp()) {
pendingReplications.decrement(storedBlock, node);
}
processAndHandleReportedBlock(storageInfo, block, ReplicaState.FINALIZED,
delHintNode);
}
private void processAndHandleReportedBlock(
DatanodeStorageInfo storageInfo, Block block,
ReplicaState reportedState, DatanodeDescriptor delHintNode)
throws IOException {
// blockReceived reports a finalized block
Collection<BlockInfo> toAdd = new LinkedList<BlockInfo>();
Collection<Block> toInvalidate = new LinkedList<Block>();
Collection<BlockToMarkCorrupt> toCorrupt = new LinkedList<BlockToMarkCorrupt>();
Collection<StatefulBlockInfo> toUC = new LinkedList<StatefulBlockInfo>();
final DatanodeDescriptor node = storageInfo.getDatanodeDescriptor();
processReportedBlock(storageInfo, block, reportedState,
toAdd, toInvalidate, toCorrupt, toUC);
// the block is only in one of the to-do lists
// if it is in none then data-node already has it
assert toUC.size() + toAdd.size() + toInvalidate.size() + toCorrupt.size() <= 1
: "The block should be only in one of the lists.";
for (StatefulBlockInfo b : toUC) {
addStoredBlockUnderConstruction(b, storageInfo);
}
long numBlocksLogged = 0;
for (BlockInfo b : toAdd) {
addStoredBlock(b, storageInfo, delHintNode, numBlocksLogged < maxNumBlocksToLog);
numBlocksLogged++;
}
if (numBlocksLogged > maxNumBlocksToLog) {
blockLog.debug("BLOCK* addBlock: logged info for {} of {} reported.",
maxNumBlocksToLog, numBlocksLogged);
}
for (Block b : toInvalidate) {
blockLog.debug("BLOCK* addBlock: block {} on node {} size {} does not " +
"belong to any file", b, node, b.getNumBytes());
addToInvalidates(b, node);
}
for (BlockToMarkCorrupt b : toCorrupt) {
markBlockAsCorrupt(b, storageInfo, node);
}
}
/**
* The given node is reporting incremental information about some blocks.
* This includes blocks that are starting to be received, completed being
* received, or deleted.
*
* This method must be called with FSNamesystem lock held.
*/
public void processIncrementalBlockReport(final DatanodeID nodeID,
final StorageReceivedDeletedBlocks srdb) throws IOException {
assert namesystem.hasWriteLock();
final DatanodeDescriptor node = datanodeManager.getDatanode(nodeID);
if (node == null || !node.isRegistered()) {
blockLog.warn("BLOCK* processIncrementalBlockReport"
+ " is received from dead or unregistered node {}", nodeID);
throw new IOException(
"Got incremental block report from unregistered or dead node");
}
boolean successful = false;
try {
processIncrementalBlockReport(node, srdb);
successful = true;
} finally {
if (!successful) {
node.setForceRegistration(true);
}
}
}
private void processIncrementalBlockReport(final DatanodeDescriptor node,
final StorageReceivedDeletedBlocks srdb) throws IOException {
DatanodeStorageInfo storageInfo =
node.getStorageInfo(srdb.getStorage().getStorageID());
if (storageInfo == null) {
// The DataNode is reporting an unknown storage. Usually the NN learns
// about new storages from heartbeats but during NN restart we may
// receive a block report or incremental report before the heartbeat.
// We must handle this for protocol compatibility. This issue was
// uncovered by HDFS-6094.
storageInfo = node.updateStorage(srdb.getStorage());
}
int received = 0;
int deleted = 0;
int receiving = 0;
for (ReceivedDeletedBlockInfo rdbi : srdb.getBlocks()) {
switch (rdbi.getStatus()) {
case DELETED_BLOCK:
removeStoredBlock(storageInfo, rdbi.getBlock(), node);
deleted++;
break;
case RECEIVED_BLOCK:
addBlock(storageInfo, rdbi.getBlock(), rdbi.getDelHints());
received++;
break;
case RECEIVING_BLOCK:
receiving++;
processAndHandleReportedBlock(storageInfo, rdbi.getBlock(),
ReplicaState.RBW, null);
break;
default:
String msg =
"Unknown block status code reported by " + node +
": " + rdbi;
blockLog.warn(msg);
assert false : msg; // if assertions are enabled, throw.
break;
}
blockLog.debug("BLOCK* block {}: {} is received from {}",
rdbi.getStatus(), rdbi.getBlock(), node);
}
blockLog.debug("*BLOCK* NameNode.processIncrementalBlockReport: from "
+ "{} receiving: {}, received: {}, deleted: {}", node, receiving,
received, deleted);
}
/**
* Return the number of nodes hosting a given block, grouped
* by the state of those replicas.
*/
public NumberReplicas countNodes(Block b) {
int decommissioned = 0;
int decommissioning = 0;
int live = 0;
int readonly = 0;
int corrupt = 0;
int excess = 0;
int stale = 0;
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(b);
for(DatanodeStorageInfo storage : blocksMap.getStorages(b)) {
if (storage.getState() == State.FAILED) {
continue;
} else if (storage.getState() == State.READ_ONLY_SHARED) {
readonly++;
continue;
}
final DatanodeDescriptor node = storage.getDatanodeDescriptor();
if ((nodesCorrupt != null) && (nodesCorrupt.contains(node))) {
corrupt++;
} else if (node.isDecommissionInProgress()) {
decommissioning++;
} else if (node.isDecommissioned()) {
decommissioned++;
} else {
LightWeightHashSet<Block> blocksExcess = excessReplicateMap.get(
node.getDatanodeUuid());
if (blocksExcess != null && blocksExcess.contains(b)) {
excess++;
} else {
live++;
}
}
if (storage.areBlockContentsStale()) {
stale++;
}
}
return new NumberReplicas(live, readonly, decommissioned, decommissioning,
corrupt, excess, stale);
}
/**
* Simpler, faster form of {@link #countNodes} that only returns the number
* of live nodes. If in startup safemode (or its 30-sec extension period),
* then it gains speed by ignoring issues of excess replicas or nodes
* that are decommissioned or in process of becoming decommissioned.
* If not in startup, then it calls {@link #countNodes} instead.
*
* @param b - the block being tested
* @return count of live nodes for this block
*/
int countLiveNodes(BlockInfo b) {
if (!namesystem.isInStartupSafeMode()) {
return countNodes(b).liveReplicas();
}
// else proceed with fast case
int live = 0;
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(b);
for (DatanodeStorageInfo storage : blocksMap.getStorages(b)) {
if (storage.getState() != State.NORMAL) {
continue;
}
final DatanodeDescriptor node = storage.getDatanodeDescriptor();
if ((nodesCorrupt == null) || (!nodesCorrupt.contains(node)))
live++;
}
return live;
}
/**
* On stopping decommission, check if the node has excess replicas.
* If there are any excess replicas, call processOverReplicatedBlock().
* Process over replicated blocks only when active NN is out of safe mode.
*/
void processOverReplicatedBlocksOnReCommission(
final DatanodeDescriptor srcNode) {
if (!isPopulatingReplQueues()) {
return;
}
final Iterator<BlockInfo> it = srcNode.getBlockIterator();
int numOverReplicated = 0;
while(it.hasNext()) {
final BlockInfo block = it.next();
short expectedReplication = block.getReplication();
NumberReplicas num = countNodes(block);
int numCurrentReplica = num.liveReplicas();
if (numCurrentReplica > expectedReplication) {
// over-replicated block
processOverReplicatedBlock(block, expectedReplication, null, null);
numOverReplicated++;
}
}
LOG.info("Invalidated " + numOverReplicated + " over-replicated blocks on " +
srcNode + " during recommissioning");
}
/**
* Returns whether a node can be safely decommissioned based on its
* liveness. Dead nodes cannot always be safely decommissioned.
*/
boolean isNodeHealthyForDecommission(DatanodeDescriptor node) {
if (!node.checkBlockReportReceived()) {
LOG.info("Node {} hasn't sent its first block report.", node);
return false;
}
if (node.isAlive()) {
return true;
}
updateState();
if (pendingReplicationBlocksCount == 0 &&
underReplicatedBlocksCount == 0) {
LOG.info("Node {} is dead and there are no under-replicated" +
" blocks or blocks pending replication. Safe to decommission.",
node);
return true;
}
LOG.warn("Node {} is dead " +
"while decommission is in progress. Cannot be safely " +
"decommissioned since there is risk of reduced " +
"data durability or data loss. Either restart the failed node or" +
" force decommissioning by removing, calling refreshNodes, " +
"then re-adding to the excludes files.", node);
return false;
}
public int getActiveBlockCount() {
return blocksMap.size();
}
public DatanodeStorageInfo[] getStorages(BlockInfo block) {
final DatanodeStorageInfo[] storages = new DatanodeStorageInfo[block.numNodes()];
int i = 0;
for(DatanodeStorageInfo s : blocksMap.getStorages(block)) {
storages[i++] = s;
}
return storages;
}
public int getTotalBlocks() {
return blocksMap.size();
}
public void removeBlock(BlockInfo block) {
assert namesystem.hasWriteLock();
// No need to ACK blocks that are being removed entirely
// from the namespace, since the removal of the associated
// file already removes them from the block map below.
block.setNumBytes(BlockCommand.NO_ACK);
addToInvalidates(block);
removeBlockFromMap(block);
// Remove the block from pendingReplications and neededReplications
pendingReplications.remove(block);
neededReplications.remove(block, UnderReplicatedBlocks.LEVEL);
postponedMisreplicatedBlocks.remove(block);
}
public BlockInfo getStoredBlock(Block block) {
return blocksMap.getStoredBlock(block);
}
public void updateLastBlock(BlockInfo lastBlock, ExtendedBlock newBlock) {
lastBlock.setNumBytes(newBlock.getNumBytes());
List<ReplicaUnderConstruction> staleReplicas = lastBlock
.setGenerationStampAndVerifyReplicas(newBlock.getGenerationStamp());
removeStaleReplicas(staleReplicas, lastBlock);
}
/** updates a block in under replication queue */
private void updateNeededReplications(final BlockInfo block,
final int curReplicasDelta, int expectedReplicasDelta) {
namesystem.writeLock();
try {
if (!isPopulatingReplQueues() || !block.isComplete()) {
return;
}
NumberReplicas repl = countNodes(block);
int pendingNum = pendingReplications.getNumReplicas(block);
int curExpectedReplicas = getReplication(block);
if (!hasEnoughEffectiveReplicas(block, repl, pendingNum,
curExpectedReplicas)) {
neededReplications.update(block, repl.liveReplicas() + pendingNum,
repl.readOnlyReplicas(), repl.decommissionedAndDecommissioning(),
curExpectedReplicas, curReplicasDelta, expectedReplicasDelta);
} else {
int oldReplicas = repl.liveReplicas() + pendingNum - curReplicasDelta;
int oldExpectedReplicas = curExpectedReplicas-expectedReplicasDelta;
neededReplications.remove(block, oldReplicas, repl.readOnlyReplicas(),
repl.decommissionedAndDecommissioning(), oldExpectedReplicas);
}
} finally {
namesystem.writeUnlock();
}
}
/**
* Check replication of the blocks in the collection.
* If any block is needed replication, insert it into the replication queue.
* Otherwise, if the block is more than the expected replication factor,
* process it as an over replicated block.
*/
public void checkReplication(BlockCollection bc) {
for (BlockInfo block : bc.getBlocks()) {
final short expected = block.getReplication();
final NumberReplicas n = countNodes(block);
final int pending = pendingReplications.getNumReplicas(block);
if (!hasEnoughEffectiveReplicas(block, n, pending, expected)) {
neededReplications.add(block, n.liveReplicas() + pending,
n.readOnlyReplicas(),
n.decommissionedAndDecommissioning(), expected);
} else if (n.liveReplicas() > expected) {
processOverReplicatedBlock(block, expected, null, null);
}
}
}
/**
* @return 0 if the block is not found;
* otherwise, return the replication factor of the block.
*/
private int getReplication(BlockInfo block) {
return getExpectedReplicaNum(block);
}
/**
* Get blocks to invalidate for <i>nodeId</i>
* in {@link #invalidateBlocks}.
*
* @return number of blocks scheduled for removal during this iteration.
*/
private int invalidateWorkForOneNode(DatanodeInfo dn) {
final List<Block> toInvalidate;
namesystem.writeLock();
try {
// blocks should not be replicated or removed if safe mode is on
if (namesystem.isInSafeMode()) {
LOG.debug("In safemode, not computing replication work");
return 0;
}
try {
DatanodeDescriptor dnDescriptor = datanodeManager.getDatanode(dn);
if (dnDescriptor == null) {
LOG.warn("DataNode " + dn + " cannot be found with UUID " +
dn.getDatanodeUuid() + ", removing block invalidation work.");
invalidateBlocks.remove(dn);
return 0;
}
toInvalidate = invalidateBlocks.invalidateWork(dnDescriptor);
if (toInvalidate == null) {
return 0;
}
} catch(UnregisteredNodeException une) {
return 0;
}
} finally {
namesystem.writeUnlock();
}
blockLog.debug("BLOCK* {}: ask {} to delete {}", getClass().getSimpleName(),
dn, toInvalidate);
return toInvalidate.size();
}
boolean isPlacementPolicySatisfied(BlockInfo storedBlock) {
List<DatanodeDescriptor> liveNodes = new ArrayList<>();
Collection<DatanodeDescriptor> corruptNodes = corruptReplicas
.getNodes(storedBlock);
for (DatanodeStorageInfo storage : blocksMap.getStorages(storedBlock)) {
final DatanodeDescriptor cur = storage.getDatanodeDescriptor();
if (!cur.isDecommissionInProgress() && !cur.isDecommissioned()
&& ((corruptNodes == null) || !corruptNodes.contains(cur))) {
liveNodes.add(cur);
}
}
DatanodeInfo[] locs = liveNodes.toArray(new DatanodeInfo[liveNodes.size()]);
return blockplacement.verifyBlockPlacement(locs,
storedBlock.getReplication()).isPlacementPolicySatisfied();
}
/**
* A block needs replication if the number of replicas is less than expected
* or if it does not have enough racks.
*/
boolean isNeededReplication(BlockInfo storedBlock, int current) {
int expected = storedBlock.getReplication();
return storedBlock.isComplete()
&& (current < expected || !isPlacementPolicySatisfied(storedBlock));
}
public short getExpectedReplicaNum(BlockInfo block) {
return block.getReplication();
}
public long getMissingBlocksCount() {
// not locking
return this.neededReplications.getCorruptBlockSize();
}
public long getMissingReplOneBlocksCount() {
// not locking
return this.neededReplications.getCorruptReplOneBlockSize();
}
public BlockInfo addBlockCollection(BlockInfo block,
BlockCollection bc) {
return blocksMap.addBlockCollection(block, bc);
}
BlockCollection getBlockCollection(BlockInfo b) {
return namesystem.getBlockCollection(b.getBlockCollectionId());
}
/** @return an iterator of the datanodes. */
public Iterable<DatanodeStorageInfo> getStorages(final Block block) {
return blocksMap.getStorages(block);
}
public int numCorruptReplicas(Block block) {
return corruptReplicas.numCorruptReplicas(block);
}
public void removeBlockFromMap(BlockInfo block) {
removeFromExcessReplicateMap(block);
blocksMap.removeBlock(block);
// If block is removed from blocksMap remove it from corruptReplicasMap
corruptReplicas.removeFromCorruptReplicasMap(block);
}
/**
* If a block is removed from blocksMap, remove it from excessReplicateMap.
*/
private void removeFromExcessReplicateMap(BlockInfo block) {
for (DatanodeStorageInfo info : blocksMap.getStorages(block)) {
String uuid = info.getDatanodeDescriptor().getDatanodeUuid();
LightWeightHashSet<Block> excessReplicas =
excessReplicateMap.get(uuid);
if (excessReplicas != null) {
if (excessReplicas.remove(block)) {
excessBlocksCount.decrementAndGet();
if (excessReplicas.isEmpty()) {
excessReplicateMap.remove(uuid);
}
}
}
}
}
public int getCapacity() {
return blocksMap.getCapacity();
}
/**
* Return an iterator over the set of blocks for which there are no replicas.
*/
public Iterator<BlockInfo> getCorruptReplicaBlockIterator() {
return neededReplications.iterator(
UnderReplicatedBlocks.QUEUE_WITH_CORRUPT_BLOCKS);
}
/**
* Get the replicas which are corrupt for a given block.
*/
public Collection<DatanodeDescriptor> getCorruptReplicas(Block block) {
return corruptReplicas.getNodes(block);
}
/**
* Get reason for certain corrupted replicas for a given block and a given dn.
*/
public String getCorruptReason(Block block, DatanodeDescriptor node) {
return corruptReplicas.getCorruptReason(block, node);
}
/** @return the size of UnderReplicatedBlocks */
public int numOfUnderReplicatedBlocks() {
return neededReplications.size();
}
/**
* Periodically calls computeReplicationWork().
*/
private class ReplicationMonitor implements Runnable {
@Override
public void run() {
while (namesystem.isRunning()) {
try {
// Process replication work only when active NN is out of safe mode.
if (isPopulatingReplQueues()) {
computeDatanodeWork();
processPendingReplications();
rescanPostponedMisreplicatedBlocks();
}
Thread.sleep(replicationRecheckInterval);
} catch (Throwable t) {
if (!namesystem.isRunning()) {
LOG.info("Stopping ReplicationMonitor.");
if (!(t instanceof InterruptedException)) {
LOG.info("ReplicationMonitor received an exception"
+ " while shutting down.", t);
}
break;
} else if (!checkNSRunning && t instanceof InterruptedException) {
LOG.info("Stopping ReplicationMonitor for testing.");
break;
}
LOG.error("ReplicationMonitor thread received Runtime exception. ",
t);
terminate(1, t);
}
}
}
}
/**
* Compute block replication and block invalidation work that can be scheduled
* on data-nodes. The datanode will be informed of this work at the next
* heartbeat.
*
* @return number of blocks scheduled for replication or removal.
*/
int computeDatanodeWork() {
// Blocks should not be replicated or removed if in safe mode.
// It's OK to check safe mode here w/o holding lock, in the worst
// case extra replications will be scheduled, and these will get
// fixed up later.
if (namesystem.isInSafeMode()) {
return 0;
}
final int numlive = heartbeatManager.getLiveDatanodeCount();
final int blocksToProcess = numlive
* this.blocksReplWorkMultiplier;
final int nodesToProcess = (int) Math.ceil(numlive
* this.blocksInvalidateWorkPct);
int workFound = this.computeReplicationWork(blocksToProcess);
// Update counters
namesystem.writeLock();
try {
this.updateState();
this.scheduledReplicationBlocksCount = workFound;
} finally {
namesystem.writeUnlock();
}
workFound += this.computeInvalidateWork(nodesToProcess);
return workFound;
}
/**
* Clear all queues that hold decisions previously made by
* this NameNode.
*/
public void clearQueues() {
neededReplications.clear();
pendingReplications.clear();
excessReplicateMap.clear();
invalidateBlocks.clear();
datanodeManager.clearPendingQueues();
postponedMisreplicatedBlocks.clear();
};
public static LocatedBlock newLocatedBlock(
ExtendedBlock b, DatanodeStorageInfo[] storages,
long startOffset, boolean corrupt) {
// startOffset is unknown
return new LocatedBlock(
b, DatanodeStorageInfo.toDatanodeInfos(storages),
DatanodeStorageInfo.toStorageIDs(storages),
DatanodeStorageInfo.toStorageTypes(storages),
startOffset, corrupt,
null);
}
/**
* A simple result enum for the result of
* {@link BlockManager#processMisReplicatedBlock(BlockInfo)}.
*/
enum MisReplicationResult {
/** The block should be invalidated since it belongs to a deleted file. */
INVALID,
/** The block is currently under-replicated. */
UNDER_REPLICATED,
/** The block is currently over-replicated. */
OVER_REPLICATED,
/** A decision can't currently be made about this block. */
POSTPONE,
/** The block is under construction, so should be ignored. */
UNDER_CONSTRUCTION,
/** The block is properly replicated. */
OK
}
public void shutdown() {
stopReplicationInitializer();
blocksMap.close();
MBeans.unregister(mxBeanName);
mxBeanName = null;
}
public void clear() {
clearQueues();
blocksMap.clear();
}
public BlockReportLeaseManager getBlockReportLeaseManager() {
return blockReportLeaseManager;
}
@Override // BlockStatsMXBean
public Map<StorageType, StorageTypeStats> getStorageTypeStats() {
return datanodeManager.getDatanodeStatistics().getStorageTypeStats();
}
/**
* Initialize replication queues.
*/
public void initializeReplQueues() {
LOG.info("initializing replication queues");
processMisReplicatedBlocks();
initializedReplQueues = true;
}
/**
* Check if replication queues are to be populated
* @return true when node is HAState.Active and not in the very first safemode
*/
public boolean isPopulatingReplQueues() {
if (!shouldPopulateReplQueues()) {
return false;
}
return initializedReplQueues;
}
public void setInitializedReplQueues(boolean v) {
this.initializedReplQueues = v;
}
public boolean shouldPopulateReplQueues() {
HAContext haContext = namesystem.getHAContext();
if (haContext == null || haContext.getState() == null)
return false;
return haContext.getState().shouldPopulateReplQueues();
}
/**
* Returns the number of bytes that reside in blocks with Generation Stamps
* greater than generation stamp known to Namenode.
*
* @return Bytes in future
*/
public long getBytesInFuture() {
return numberOfBytesInFutureBlocks.get();
}
/**
* Clears the bytes in future counter.
*/
public void clearBytesInFuture() {
numberOfBytesInFutureBlocks.set(0);
}
/**
* Returns true if Namenode was started with a RollBack option.
*
* @param option - StartupOption
* @return boolean
*/
private boolean isInRollBackMode(HdfsServerConstants.StartupOption option) {
if (option == HdfsServerConstants.StartupOption.ROLLBACK) {
return true;
}
if ((option == HdfsServerConstants.StartupOption.ROLLINGUPGRADE) &&
(option.getRollingUpgradeStartupOption() ==
HdfsServerConstants.RollingUpgradeStartupOption.ROLLBACK)) {
return true;
}
return false;
}
// async processing of an action, used for IBRs.
public void enqueueBlockOp(final Runnable action) throws IOException {
try {
blockReportThread.enqueue(action);
} catch (InterruptedException ie) {
throw new IOException(ie);
}
}
// sync batch processing for a full BR.
public <T> T runBlockOp(final Callable<T> action)
throws IOException {
final FutureTask<T> future = new FutureTask<T>(action);
enqueueBlockOp(future);
try {
return future.get();
} catch (ExecutionException ee) {
Throwable cause = ee.getCause();
if (cause == null) {
cause = ee;
}
if (!(cause instanceof IOException)) {
cause = new IOException(cause);
}
throw (IOException)cause;
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
throw new IOException(ie);
}
}
@VisibleForTesting
public void flushBlockOps() throws IOException {
runBlockOp(new Callable<Void>(){
@Override
public Void call() {
return null;
}
});
}
public int getBlockOpQueueLength() {
return blockReportThread.queue.size();
}
private class BlockReportProcessingThread extends Thread {
private static final long MAX_LOCK_HOLD_MS = 4;
private long lastFull = 0;
private final BlockingQueue<Runnable> queue =
new ArrayBlockingQueue<Runnable>(1024);
BlockReportProcessingThread() {
super("Block report processor");
setDaemon(true);
}
@Override
public void run() {
try {
processQueue();
} catch (Throwable t) {
ExitUtil.terminate(1,
getName() + " encountered fatal exception: " + t);
}
}
private void processQueue() {
while (namesystem.isRunning()) {
NameNodeMetrics metrics = NameNode.getNameNodeMetrics();
try {
Runnable action = queue.take();
// batch as many operations in the write lock until the queue
// runs dry, or the max lock hold is reached.
int processed = 0;
namesystem.writeLock();
metrics.setBlockOpsQueued(queue.size() + 1);
try {
long start = Time.monotonicNow();
do {
processed++;
action.run();
if (Time.monotonicNow() - start > MAX_LOCK_HOLD_MS) {
break;
}
action = queue.poll();
} while (action != null);
} finally {
namesystem.writeUnlock();
metrics.addBlockOpsBatched(processed - 1);
}
} catch (InterruptedException e) {
// ignore unless thread was specifically interrupted.
if (Thread.interrupted()) {
break;
}
}
}
queue.clear();
}
void enqueue(Runnable action) throws InterruptedException {
if (!queue.offer(action)) {
if (!isAlive() && namesystem.isRunning()) {
ExitUtil.terminate(1, getName()+" is not running");
}
long now = Time.monotonicNow();
if (now - lastFull > 4000) {
lastFull = now;
LOG.info("Block report queue is full");
}
queue.put(action);
}
}
}
boolean isReplicaCorrupt(BlockInfo blk, DatanodeDescriptor d) {
return corruptReplicas.isReplicaCorrupt(blk, d);
}
}