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HDFS-5020. Make DatanodeProtocol#blockReceivedAndDeleted idempotent. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506421 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2013-07-24 07:18:11 +00:00
parent 3024030b24
commit 538653d94c
6 changed files with 164 additions and 27 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -469,6 +469,9 @@ Release 2.1.0-beta - 2013-07-02
HADOOP-9760. Move GSet and related classes to common from HDFS.
(suresh)
HDFS-5020. Make DatanodeProtocol#blockReceivedAndDeleted idempotent.
(jing9)
OPTIMIZATIONS
HDFS-4465. Optimize datanode ReplicasMap and ReplicaInfo. (atm)

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -1336,7 +1336,7 @@ public class BlockManager {
// 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, targets.length);
pendingReplications.increment(block, targets);
if(blockLog.isDebugEnabled()) {
blockLog.debug(
"BLOCK* block " + block
@ -2622,6 +2622,8 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
void addBlock(DatanodeDescriptor node, Block block, String delHint)
throws IOException {
// 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.decBlocksScheduled();
// get the deletion hint node
@ -2637,7 +2639,7 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
//
// Modify the blocks->datanode map and node's map.
//
pendingReplications.decrement(block);
pendingReplications.decrement(block, node);
processAndHandleReportedBlock(node, block, ReplicaState.FINALIZED,
delHintNode);
}

46
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/PendingReplicationBlocks.java
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@ -22,8 +22,10 @@ import static org.apache.hadoop.util.Time.now;
import java.io.PrintWriter;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
@ -71,14 +73,16 @@ class PendingReplicationBlocks {
/**
* Add a block to the list of pending Replications
* @param block The corresponding block
* @param targets The DataNodes where replicas of the block should be placed
*/
void increment(Block block, int numReplicas) {
void increment(Block block, DatanodeDescriptor[] targets) {
synchronized (pendingReplications) {
PendingBlockInfo found = pendingReplications.get(block);
if (found == null) {
pendingReplications.put(block, new PendingBlockInfo(numReplicas));
pendingReplications.put(block, new PendingBlockInfo(targets));
} else {
found.incrementReplicas(numReplicas);
found.incrementReplicas(targets);
found.setTimeStamp();
}
}
@ -88,15 +92,17 @@ class PendingReplicationBlocks {
* One replication request for this block has finished.
* Decrement the number of pending replication requests
* for this block.
*
* @param The DataNode that finishes the replication
*/
void decrement(Block block) {
void decrement(Block block, DatanodeDescriptor dn) {
synchronized (pendingReplications) {
PendingBlockInfo found = pendingReplications.get(block);
if (found != null) {
if(LOG.isDebugEnabled()) {
LOG.debug("Removing pending replication for " + block);
}
found.decrementReplicas();
found.decrementReplicas(dn);
if (found.getNumReplicas() <= 0) {
pendingReplications.remove(block);
}
@ -153,7 +159,7 @@ class PendingReplicationBlocks {
return null;
}
Block[] blockList = timedOutItems.toArray(
new Block[timedOutItems.size()]);
new Block[timedOutItems.size()]);
timedOutItems.clear();
return blockList;
}
@ -163,16 +169,17 @@ class PendingReplicationBlocks {
* An object that contains information about a block that
* is being replicated. It records the timestamp when the
* system started replicating the most recent copy of this
* block. It also records the number of replication
* requests that are in progress.
* block. It also records the list of Datanodes where the
* replication requests are in progress.
*/
static class PendingBlockInfo {
private long timeStamp;
private int numReplicasInProgress;
private final List<DatanodeDescriptor> targets;
PendingBlockInfo(int numReplicas) {
PendingBlockInfo(DatanodeDescriptor[] targets) {
this.timeStamp = now();
this.numReplicasInProgress = numReplicas;
this.targets = targets == null ? new ArrayList<DatanodeDescriptor>()
: new ArrayList<DatanodeDescriptor>(Arrays.asList(targets));
}
long getTimeStamp() {
@ -183,17 +190,20 @@ class PendingReplicationBlocks {
timeStamp = now();
}
void incrementReplicas(int increment) {
numReplicasInProgress += increment;
void incrementReplicas(DatanodeDescriptor... newTargets) {
if (newTargets != null) {
for (DatanodeDescriptor dn : newTargets) {
targets.add(dn);
}
}
}
void decrementReplicas() {
numReplicasInProgress--;
assert(numReplicasInProgress >= 0);
void decrementReplicas(DatanodeDescriptor dn) {
targets.remove(dn);
}
int getNumReplicas() {
return numReplicasInProgress;
return targets.size();
}
}
@ -274,7 +284,7 @@ class PendingReplicationBlocks {
out.println(block +
" StartTime: " + new Time(pendingBlock.timeStamp) +
" NumReplicaInProgress: " +
pendingBlock.numReplicasInProgress);
pendingBlock.getNumReplicas());
}
}
}

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
View File

@ -982,7 +982,8 @@ public class DataNode extends Configured
* @return BP registration object
* @throws IOException
*/
DatanodeRegistration getDNRegistrationForBP(String bpid)
@VisibleForTesting
public DatanodeRegistration getDNRegistrationForBP(String bpid)
throws IOException {
BPOfferService bpos = blockPoolManager.get(bpid);
if(bpos==null || bpos.bpRegistration==null) {

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/DatanodeProtocol.java
View File

@ -138,7 +138,7 @@ public interface DatanodeProtocol {
* writes a new Block here, or another DataNode copies a Block to
* this DataNode, it will call blockReceived().
*/
@AtMostOnce
@Idempotent
public void blockReceivedAndDeleted(DatanodeRegistration registration,
String poolId,
StorageReceivedDeletedBlocks[] rcvdAndDeletedBlocks)

131
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestPendingReplication.java
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@ -20,6 +20,8 @@ package org.apache.hadoop.hdfs.server.blockmanagement;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
@ -28,13 +30,21 @@ import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo.BlockStatus;
import org.apache.hadoop.hdfs.server.protocol.StorageReceivedDeletedBlocks;
import org.junit.Test;
import com.google.common.base.Preconditions;
/**
* This class tests the internals of PendingReplicationBlocks.java,
* as well as how PendingReplicationBlocks acts in BlockManager
@ -45,6 +55,21 @@ public class TestPendingReplication {
// Number of datanodes in the cluster
private static final int DATANODE_COUNT = 5;
private DatanodeDescriptor genDatanodeId(int seed) {
seed = seed % 256;
String ip = seed + "." + seed + "." + seed + "." + seed;
return DFSTestUtil.getDatanodeDescriptor(ip, null);
}
private DatanodeDescriptor[] genDatanodes(int number) {
Preconditions.checkArgument(number >= 0);
DatanodeDescriptor[] nodes = new DatanodeDescriptor[number];
for (int i = 0; i < number; i++) {
nodes[i] = genDatanodeId(i);
}
return nodes;
}
@Test
public void testPendingReplication() {
PendingReplicationBlocks pendingReplications;
@ -56,7 +81,7 @@ public class TestPendingReplication {
//
for (int i = 0; i < 10; i++) {
Block block = new Block(i, i, 0);
pendingReplications.increment(block, i);
pendingReplications.increment(block, genDatanodes(i));
}
assertEquals("Size of pendingReplications ",
10, pendingReplications.size());
@ -66,15 +91,16 @@ public class TestPendingReplication {
// remove one item and reinsert it
//
Block blk = new Block(8, 8, 0);
pendingReplications.decrement(blk); // removes one replica
pendingReplications.decrement(blk, genDatanodeId(7)); // removes one replica
assertEquals("pendingReplications.getNumReplicas ",
7, pendingReplications.getNumReplicas(blk));
for (int i = 0; i < 7; i++) {
pendingReplications.decrement(blk); // removes all replicas
// removes all replicas
pendingReplications.decrement(blk, genDatanodeId(i));
}
assertTrue(pendingReplications.size() == 9);
pendingReplications.increment(blk, 8);
pendingReplications.increment(blk, genDatanodes(8));
assertTrue(pendingReplications.size() == 10);
//
@ -102,7 +128,7 @@ public class TestPendingReplication {
for (int i = 10; i < 15; i++) {
Block block = new Block(i, i, 0);
pendingReplications.increment(block, i);
pendingReplications.increment(block, genDatanodes(i));
}
assertTrue(pendingReplications.size() == 15);
@ -133,6 +159,101 @@ public class TestPendingReplication {
pendingReplications.stop();
}
/**
* Test if DatanodeProtocol#blockReceivedAndDeleted can correctly update the
* pending replications. Also make sure the blockReceivedAndDeleted call is
* idempotent to the pending replications.
*/
@Test
public void testBlockReceived() throws Exception {
final Configuration conf = new HdfsConfiguration();
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1024);
MiniDFSCluster cluster = null;
try {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(
DATANODE_COUNT).build();
cluster.waitActive();
DistributedFileSystem hdfs = cluster.getFileSystem();
FSNamesystem fsn = cluster.getNamesystem();
BlockManager blkManager = fsn.getBlockManager();
final String file = "/tmp.txt";
final Path filePath = new Path(file);
short replFactor = 1;
DFSTestUtil.createFile(hdfs, filePath, 1024L, replFactor, 0);
// temporarily stop the heartbeat
ArrayList<DataNode> datanodes = cluster.getDataNodes();
for (int i = 0; i < DATANODE_COUNT; i++) {
DataNodeTestUtils.setHeartbeatsDisabledForTests(datanodes.get(i), true);
}
hdfs.setReplication(filePath, (short) DATANODE_COUNT);
BlockManagerTestUtil.computeAllPendingWork(blkManager);
assertEquals(1, blkManager.pendingReplications.size());
INodeFile fileNode = fsn.getFSDirectory().getINode4Write(file).asFile();
Block[] blocks = fileNode.getBlocks();
assertEquals(DATANODE_COUNT - 1,
blkManager.pendingReplications.getNumReplicas(blocks[0]));
LocatedBlock locatedBlock = hdfs.getClient().getLocatedBlocks(file, 0)
.get(0);
DatanodeInfo existingDn = (locatedBlock.getLocations())[0];
int reportDnNum = 0;
String poolId = cluster.getNamesystem().getBlockPoolId();
// let two datanodes (other than the one that already has the data) to
// report to NN
for (int i = 0; i < DATANODE_COUNT && reportDnNum < 2; i++) {
if (!datanodes.get(i).getDatanodeId().equals(existingDn)) {
DatanodeRegistration dnR = datanodes.get(i).getDNRegistrationForBP(
poolId);
StorageReceivedDeletedBlocks[] report = {
new StorageReceivedDeletedBlocks(dnR.getStorageID(),
new ReceivedDeletedBlockInfo[] { new ReceivedDeletedBlockInfo(
blocks[0], BlockStatus.RECEIVED_BLOCK, "") }) };
cluster.getNameNodeRpc().blockReceivedAndDeleted(dnR, poolId, report);
reportDnNum++;
}
}
assertEquals(DATANODE_COUNT - 3,
blkManager.pendingReplications.getNumReplicas(blocks[0]));
// let the same datanodes report again
for (int i = 0; i < DATANODE_COUNT && reportDnNum < 2; i++) {
if (!datanodes.get(i).getDatanodeId().equals(existingDn)) {
DatanodeRegistration dnR = datanodes.get(i).getDNRegistrationForBP(
poolId);
StorageReceivedDeletedBlocks[] report =
{ new StorageReceivedDeletedBlocks(dnR.getStorageID(),
new ReceivedDeletedBlockInfo[] { new ReceivedDeletedBlockInfo(
blocks[0], BlockStatus.RECEIVED_BLOCK, "") }) };
cluster.getNameNodeRpc().blockReceivedAndDeleted(dnR, poolId, report);
reportDnNum++;
}
}
assertEquals(DATANODE_COUNT - 3,
blkManager.pendingReplications.getNumReplicas(blocks[0]));
// re-enable heartbeat for the datanode that has data
for (int i = 0; i < DATANODE_COUNT; i++) {
DataNodeTestUtils
.setHeartbeatsDisabledForTests(datanodes.get(i), false);
DataNodeTestUtils.triggerHeartbeat(datanodes.get(i));
}
Thread.sleep(5000);
assertEquals(0, blkManager.pendingReplications.size());
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Test if BlockManager can correctly remove corresponding pending records
* when a file is deleted