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HDFS-7928. Scanning blocks from disk during rolling upgrade startup takes a lot of time if disks are busy. Contributed by Rushabh Shah. 

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
This commit is contained in:
Kihwal Lee 2015-03-25 14:42:28 -05:00
parent c62840d531
commit be4eabdcd4
13 changed files with 431 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -24,6 +24,9 @@ Release 2.8.0 - UNRELEASED
HDFS-7713. Implement mkdirs in the HDFS Web UI. (Ravi Prakash via wheat9)
HDFS-7928. Scanning blocks from disk during rolling upgrade startup takes
a lot of time if disks are busy (Rushabh S Shah via kihwal)
OPTIMIZATIONS
BUG FIXES

37
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/BlockListAsLongs.java
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@ -18,6 +18,8 @@
package org.apache.hadoop.hdfs.protocol;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
@ -33,6 +35,7 @@ import com.google.common.base.Preconditions;
import com.google.protobuf.ByteString;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import com.google.protobuf.WireFormat;
@InterfaceAudience.Private
@InterfaceStability.Evolving
@ -108,6 +111,40 @@ public abstract class BlockListAsLongs implements Iterable<BlockReportReplica> {
return builder.build();
}
public static BlockListAsLongs readFrom(InputStream is) throws IOException {
CodedInputStream cis = CodedInputStream.newInstance(is);
int numBlocks = -1;
ByteString blocksBuf = null;
while (!cis.isAtEnd()) {
int tag = cis.readTag();
int field = WireFormat.getTagFieldNumber(tag);
switch(field) {
case 0:
break;
case 1:
numBlocks = (int)cis.readInt32();
break;
case 2:
blocksBuf = cis.readBytes();
break;
default:
cis.skipField(tag);
break;
}
}
if (numBlocks != -1 && blocksBuf != null) {
return decodeBuffer(numBlocks, blocksBuf);
}
return null;
}
public void writeTo(OutputStream os) throws IOException {
CodedOutputStream cos = CodedOutputStream.newInstance(os);
cos.writeInt32(1, getNumberOfBlocks());
cos.writeBytes(2, getBlocksBuffer());
cos.flush();
}
public static Builder builder() {
return new BlockListAsLongs.Builder();
}

7
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
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@ -41,8 +41,6 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_MAX_LOCKED_MEMOR
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_NETWORK_COUNTS_CACHE_MAX_SIZE_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_NETWORK_COUNTS_CACHE_MAX_SIZE_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_PLUGINS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_SCAN_PERIOD_HOURS_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_SCAN_PERIOD_HOURS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_STARTUP_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_MAX_NUM_BLOCKS_TO_LOG_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_MAX_NUM_BLOCKS_TO_LOG_KEY;
@ -160,6 +158,7 @@ import org.apache.hadoop.hdfs.server.common.StorageInfo;
import org.apache.hadoop.hdfs.server.datanode.SecureDataNodeStarter.SecureResources;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
import org.apache.hadoop.hdfs.server.datanode.metrics.DataNodeMetrics;
import org.apache.hadoop.hdfs.server.namenode.FileChecksumServlets;
import org.apache.hadoop.hdfs.server.namenode.StreamFile;
@ -2507,6 +2506,10 @@ public class DataNode extends ReconfigurableBase
return blockScanner;
}
@VisibleForTesting
DirectoryScanner getDirectoryScanner() {
return directoryScanner;
}
public static void secureMain(String args[], SecureResources resources) {
int errorCode = 0;

268
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
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@ -23,12 +23,12 @@ import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.RandomAccessFile;
import java.io.Writer;
import java.util.Iterator;
import java.util.Scanner;
import org.apache.commons.io.FileUtils;
@ -39,6 +39,8 @@ import org.apache.hadoop.fs.DU;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.DFSConfigKeys;
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.HdfsConstants;
import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
import org.apache.hadoop.hdfs.server.datanode.DataStorage;
@ -55,6 +57,7 @@ import org.apache.hadoop.util.DiskChecker.DiskErrorException;
import org.apache.hadoop.util.ShutdownHookManager;
import org.apache.hadoop.util.Time;
import com.google.common.io.Files;
/**
* A block pool slice represents a portion of a block pool stored on a volume.
* Taken together, all BlockPoolSlices sharing a block pool ID across a
@ -77,7 +80,9 @@ class BlockPoolSlice {
private volatile boolean dfsUsedSaved = false;
private static final int SHUTDOWN_HOOK_PRIORITY = 30;
private final boolean deleteDuplicateReplicas;
private static final String REPLICA_CACHE_FILE = "replicas";
private final long replicaCacheExpiry = 5*60*1000;
// TODO:FEDERATION scalability issue - a thread per DU is needed
private final DU dfsUsage;
@ -316,11 +321,14 @@ class BlockPoolSlice {
FsDatasetImpl.LOG.info(
"Recovered " + numRecovered + " replicas from " + lazypersistDir);
}
// add finalized replicas
addToReplicasMap(volumeMap, finalizedDir, lazyWriteReplicaMap, true);
// add rbw replicas
addToReplicasMap(volumeMap, rbwDir, lazyWriteReplicaMap, false);
boolean success = readReplicasFromCache(volumeMap, lazyWriteReplicaMap);
if (!success) {
// add finalized replicas
addToReplicasMap(volumeMap, finalizedDir, lazyWriteReplicaMap, true);
// add rbw replicas
addToReplicasMap(volumeMap, rbwDir, lazyWriteReplicaMap, false);
}
}
/**
@ -407,6 +415,75 @@ class BlockPoolSlice {
FileUtil.fullyDelete(source);
return numRecovered;
}
private void addReplicaToReplicasMap(Block block, ReplicaMap volumeMap,
final RamDiskReplicaTracker lazyWriteReplicaMap,boolean isFinalized)
throws IOException {
ReplicaInfo newReplica = null;
long blockId = block.getBlockId();
long genStamp = block.getGenerationStamp();
if (isFinalized) {
newReplica = new FinalizedReplica(blockId,
block.getNumBytes(), genStamp, volume, DatanodeUtil
.idToBlockDir(finalizedDir, blockId));
} else {
File file = new File(rbwDir, block.getBlockName());
boolean loadRwr = true;
File restartMeta = new File(file.getParent() +
File.pathSeparator + "." + file.getName() + ".restart");
Scanner sc = null;
try {
sc = new Scanner(restartMeta, "UTF-8");
// The restart meta file exists
if (sc.hasNextLong() && (sc.nextLong() > Time.now())) {
// It didn't expire. Load the replica as a RBW.
// We don't know the expected block length, so just use 0
// and don't reserve any more space for writes.
newReplica = new ReplicaBeingWritten(blockId,
validateIntegrityAndSetLength(file, genStamp),
genStamp, volume, file.getParentFile(), null, 0);
loadRwr = false;
}
sc.close();
if (!restartMeta.delete()) {
FsDatasetImpl.LOG.warn("Failed to delete restart meta file: " +
restartMeta.getPath());
}
} catch (FileNotFoundException fnfe) {
// nothing to do hereFile dir =
} finally {
if (sc != null) {
sc.close();
}
}
// Restart meta doesn't exist or expired.
if (loadRwr) {
newReplica = new ReplicaWaitingToBeRecovered(blockId,
validateIntegrityAndSetLength(file, genStamp),
genStamp, volume, file.getParentFile());
}
}
ReplicaInfo oldReplica = volumeMap.get(bpid, newReplica.getBlockId());
if (oldReplica == null) {
volumeMap.add(bpid, newReplica);
} else {
// We have multiple replicas of the same block so decide which one
// to keep.
newReplica = resolveDuplicateReplicas(newReplica, oldReplica, volumeMap);
}
// If we are retaining a replica on transient storage make sure
// it is in the lazyWriteReplicaMap so it can be persisted
// eventually.
if (newReplica.getVolume().isTransientStorage()) {
lazyWriteReplicaMap.addReplica(bpid, blockId,
(FsVolumeImpl) newReplica.getVolume());
} else {
lazyWriteReplicaMap.discardReplica(bpid, blockId, false);
}
}
/**
* Add replicas under the given directory to the volume map
@ -440,66 +517,9 @@ class BlockPoolSlice {
long genStamp = FsDatasetUtil.getGenerationStampFromFile(
files, file);
long blockId = Block.filename2id(file.getName());
ReplicaInfo newReplica = null;
if (isFinalized) {
newReplica = new FinalizedReplica(blockId,
file.length(), genStamp, volume, file.getParentFile());
} else {
boolean loadRwr = true;
File restartMeta = new File(file.getParent() +
File.pathSeparator + "." + file.getName() + ".restart");
Scanner sc = null;
try {
sc = new Scanner(restartMeta, "UTF-8");
// The restart meta file exists
if (sc.hasNextLong() && (sc.nextLong() > Time.now())) {
// It didn't expire. Load the replica as a RBW.
// We don't know the expected block length, so just use 0
// and don't reserve any more space for writes.
newReplica = new ReplicaBeingWritten(blockId,
validateIntegrityAndSetLength(file, genStamp),
genStamp, volume, file.getParentFile(), null, 0);
loadRwr = false;
}
sc.close();
if (!restartMeta.delete()) {
FsDatasetImpl.LOG.warn("Failed to delete restart meta file: " +
restartMeta.getPath());
}
} catch (FileNotFoundException fnfe) {
// nothing to do hereFile dir =
} finally {
if (sc != null) {
sc.close();
}
}
// Restart meta doesn't exist or expired.
if (loadRwr) {
newReplica = new ReplicaWaitingToBeRecovered(blockId,
validateIntegrityAndSetLength(file, genStamp),
genStamp, volume, file.getParentFile());
}
}
ReplicaInfo oldReplica = volumeMap.get(bpid, newReplica.getBlockId());
if (oldReplica == null) {
volumeMap.add(bpid, newReplica);
} else {
// We have multiple replicas of the same block so decide which one
// to keep.
newReplica = resolveDuplicateReplicas(newReplica, oldReplica, volumeMap);
}
// If we are retaining a replica on transient storage make sure
// it is in the lazyWriteReplicaMap so it can be persisted
// eventually.
if (newReplica.getVolume().isTransientStorage()) {
lazyWriteReplicaMap.addReplica(bpid, blockId,
(FsVolumeImpl) newReplica.getVolume());
} else {
lazyWriteReplicaMap.discardReplica(bpid, blockId, false);
}
Block block = new Block(blockId, file.length(), genStamp);
addReplicaToReplicasMap(block, volumeMap, lazyWriteReplicaMap,
isFinalized);
}
}
@ -655,9 +675,121 @@ class BlockPoolSlice {
return currentDir.getAbsolutePath();
}
void shutdown() {
void shutdown(BlockListAsLongs blocksListToPersist) {
saveReplicas(blocksListToPersist);
saveDfsUsed();
dfsUsedSaved = true;
dfsUsage.shutdown();
}
private boolean readReplicasFromCache(ReplicaMap volumeMap,
final RamDiskReplicaTracker lazyWriteReplicaMap) {
ReplicaMap tmpReplicaMap = new ReplicaMap(this);
File replicaFile = new File(currentDir, REPLICA_CACHE_FILE);
// Check whether the file exists or not.
if (!replicaFile.exists()) {
LOG.info("Replica Cache file: "+ replicaFile.getPath() +
" doesn't exist ");
return false;
}
long fileLastModifiedTime = replicaFile.lastModified();
if (System.currentTimeMillis() > fileLastModifiedTime + replicaCacheExpiry) {
LOG.info("Replica Cache file: " + replicaFile.getPath() +
" has gone stale");
// Just to make findbugs happy
if (!replicaFile.delete()) {
LOG.info("Replica Cache file: " + replicaFile.getPath() +
" cannot be deleted");
}
return false;
}
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(replicaFile);
BlockListAsLongs blocksList = BlockListAsLongs.readFrom(inputStream);
Iterator<BlockReportReplica> iterator = blocksList.iterator();
while (iterator.hasNext()) {
BlockReportReplica replica = iterator.next();
switch (replica.getState()) {
case FINALIZED:
addReplicaToReplicasMap(replica, tmpReplicaMap, lazyWriteReplicaMap, true);
break;
case RUR:
case RBW:
case RWR:
addReplicaToReplicasMap(replica, tmpReplicaMap, lazyWriteReplicaMap, false);
break;
default:
break;
}
}
inputStream.close();
// Now it is safe to add the replica into volumeMap
// In case of any exception during parsing this cache file, fall back
// to scan all the files on disk.
for (ReplicaInfo info: tmpReplicaMap.replicas(bpid)) {
volumeMap.add(bpid, info);
}
LOG.info("Successfully read replica from cache file : "
+ replicaFile.getPath());
return true;
} catch (Exception e) {
// Any exception we need to revert back to read from disk
// Log the error and return false
LOG.info("Exception occured while reading the replicas cache file: "
+ replicaFile.getPath(), e );
return false;
}
finally {
if (!replicaFile.delete()) {
LOG.info("Failed to delete replica cache file: " +
replicaFile.getPath());
}
// close the inputStream
IOUtils.closeStream(inputStream);
}
}
private void saveReplicas(BlockListAsLongs blocksListToPersist) {
if (blocksListToPersist == null ||
blocksListToPersist.getNumberOfBlocks()== 0) {
return;
}
File tmpFile = new File(currentDir, REPLICA_CACHE_FILE + ".tmp");
if (tmpFile.exists() && !tmpFile.delete()) {
LOG.warn("Failed to delete tmp replicas file in " +
tmpFile.getPath());
return;
}
File replicaCacheFile = new File(currentDir, REPLICA_CACHE_FILE);
if (replicaCacheFile.exists() && !replicaCacheFile.delete()) {
LOG.warn("Failed to delete replicas file in " +
replicaCacheFile.getPath());
return;
}
FileOutputStream out = null;
try {
out = new FileOutputStream(tmpFile);
blocksListToPersist.writeTo(out);
out.close();
// Renaming the tmp file to replicas
Files.move(tmpFile, replicaCacheFile);
} catch (Exception e) {
// If write failed, the volume might be bad. Since the cache file is
// not critical, log the error, delete both the files (tmp and cache)
// and continue.
LOG.warn("Failed to write replicas to cache ", e);
if (replicaCacheFile.exists() && !replicaCacheFile.delete()) {
LOG.warn("Failed to delete replicas file: " +
replicaCacheFile.getPath());
}
} finally {
IOUtils.closeStream(out);
if (tmpFile.exists() && !tmpFile.delete()) {
LOG.warn("Failed to delete tmp file in " +
tmpFile.getPath());
}
}
}
}

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

@ -2463,8 +2463,9 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
@Override
public synchronized void shutdownBlockPool(String bpid) {
LOG.info("Removing block pool " + bpid);
Map<DatanodeStorage, BlockListAsLongs> blocksPerVolume = getBlockReports(bpid);
volumeMap.cleanUpBlockPool(bpid);
volumes.removeBlockPool(bpid);
volumes.removeBlockPool(bpid, blocksPerVolume);
}
/**

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
View File

@ -50,6 +50,7 @@ import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.datanode.DataStorage;
import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
@ -65,7 +66,6 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.apache.hadoop.util.Time;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -805,7 +805,7 @@ public class FsVolumeImpl implements FsVolumeSpi {
}
Set<Entry<String, BlockPoolSlice>> set = bpSlices.entrySet();
for (Entry<String, BlockPoolSlice> entry : set) {
entry.getValue().shutdown();
entry.getValue().shutdown(null);
}
}
@ -815,10 +815,10 @@ public class FsVolumeImpl implements FsVolumeSpi {
bpSlices.put(bpid, bp);
}
void shutdownBlockPool(String bpid) {
void shutdownBlockPool(String bpid, BlockListAsLongs blocksListsAsLongs) {
BlockPoolSlice bp = bpSlices.get(bpid);
if (bp != null) {
bp.shutdown();
bp.shutdown(blocksListsAsLongs);
}
bpSlices.remove(bpid);
}

7
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeList.java
View File

@ -35,10 +35,12 @@ import java.util.concurrent.atomic.AtomicReference;
import com.google.common.collect.Lists;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.VolumeChoosingPolicy;
import org.apache.hadoop.hdfs.server.datanode.BlockScanner;
import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
import org.apache.hadoop.util.DiskChecker.DiskErrorException;
import org.apache.hadoop.util.Time;
@ -428,9 +430,10 @@ class FsVolumeList {
bpid + ": " + totalTimeTaken + "ms");
}
void removeBlockPool(String bpid) {
void removeBlockPool(String bpid, Map<DatanodeStorage, BlockListAsLongs>
blocksPerVolume) {
for (FsVolumeImpl v : volumes.get()) {
v.shutdownBlockPool(bpid);
v.shutdownBlockPool(bpid, blocksPerVolume.get(v.toDatanodeStorage()));
}
}

5
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/UpgradeUtilities.java
View File

@ -304,10 +304,11 @@ public class UpgradeUtilities {
continue;
}
// skip VERSION and dfsUsed file for DataNodes
// skip VERSION and dfsUsed and replicas file for DataNodes
if (nodeType == DATA_NODE &&
(list[i].getName().equals("VERSION") ||
list[i].getName().equals("dfsUsed"))) {
list[i].getName().equals("dfsUsed") ||
list[i].getName().equals("replicas"))) {
continue;
}

7
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/DataNodeTestUtils.java
View File

@ -218,4 +218,11 @@ public class DataNodeTestUtils {
}
}
}
public static void runDirectoryScanner(DataNode dn) throws IOException {
DirectoryScanner directoryScanner = dn.getDirectoryScanner();
if (directoryScanner != null) {
dn.getDirectoryScanner().reconcile();
}
}
}

154
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestWriteToReplica.java
View File

@ -17,14 +17,25 @@
*/
package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
import java.io.IOException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
import org.apache.hadoop.hdfs.server.datanode.ReplicaAlreadyExistsException;
import org.apache.hadoop.hdfs.server.datanode.ReplicaBeingWritten;
@ -34,6 +45,7 @@ import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
import org.apache.hadoop.hdfs.server.datanode.ReplicaNotFoundException;
import org.apache.hadoop.hdfs.server.datanode.ReplicaUnderRecovery;
import org.apache.hadoop.hdfs.server.datanode.ReplicaWaitingToBeRecovered;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.util.DiskChecker.DiskOutOfSpaceException;
import org.junit.Assert;
import org.junit.Test;
@ -501,4 +513,144 @@ public class TestWriteToReplica {
+ "genstamp and replaced it with the newer one: " + blocks[NON_EXISTENT]);
}
}
/**
* This is a test to check the replica map before and after the datanode
* quick restart (less than 5 minutes)
* @throws Exception
*/
@Test
public void testReplicaMapAfterDatanodeRestart() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.nnTopology(MiniDFSNNTopology.simpleFederatedTopology(2))
.build();
try {
cluster.waitActive();
NameNode nn1 = cluster.getNameNode(0);
NameNode nn2 = cluster.getNameNode(1);
assertNotNull("cannot create nn1", nn1);
assertNotNull("cannot create nn2", nn2);
// check number of volumes in fsdataset
DataNode dn = cluster.getDataNodes().get(0);
FsDatasetImpl dataSet = (FsDatasetImpl)DataNodeTestUtils.
getFSDataset(dn);
ReplicaMap replicaMap = dataSet.volumeMap;
List<FsVolumeImpl> volumes = dataSet.getVolumes();
// number of volumes should be 2 - [data1, data2]
assertEquals("number of volumes is wrong", 2, volumes.size());
ArrayList<String> bpList = new ArrayList<String>(Arrays.asList(
cluster.getNamesystem(0).getBlockPoolId(),
cluster.getNamesystem(1).getBlockPoolId()));
Assert.assertTrue("Cluster should have 2 block pools",
bpList.size() == 2);
createReplicas(bpList, volumes, replicaMap);
ReplicaMap oldReplicaMap = new ReplicaMap(this);
oldReplicaMap.addAll(replicaMap);
cluster.restartDataNode(0);
cluster.waitActive();
dn = cluster.getDataNodes().get(0);
dataSet = (FsDatasetImpl) dn.getFSDataset();
testEqualityOfReplicaMap(oldReplicaMap, dataSet.volumeMap, bpList);
} finally {
cluster.shutdown();
}
}
/**
* Compare the replica map before and after the restart
**/
private void testEqualityOfReplicaMap(ReplicaMap oldReplicaMap, ReplicaMap
newReplicaMap, List<String> bpidList) {
// Traversing through newReplica map and remove the corresponding
// replicaInfo from oldReplicaMap.
for (String bpid: bpidList) {
for (ReplicaInfo info: newReplicaMap.replicas(bpid)) {
assertNotNull("Volume map before restart didn't contain the "
+ "blockpool: " + bpid, oldReplicaMap.replicas(bpid));
ReplicaInfo oldReplicaInfo = oldReplicaMap.get(bpid,
info.getBlockId());
// Volume map after restart contains a blockpool id which
assertNotNull("Old Replica Map didnt't contain block with blockId: " +
info.getBlockId(), oldReplicaInfo);
ReplicaState oldState = oldReplicaInfo.getState();
// Since after restart, all the RWR, RBW and RUR blocks gets
// converted to RWR
if (info.getState() == ReplicaState.RWR) {
if (oldState == ReplicaState.RWR || oldState == ReplicaState.RBW
|| oldState == ReplicaState.RUR) {
oldReplicaMap.remove(bpid, oldReplicaInfo);
}
} else if (info.getState() == ReplicaState.FINALIZED &&
oldState == ReplicaState.FINALIZED) {
oldReplicaMap.remove(bpid, oldReplicaInfo);
}
}
}
// We don't persist the ReplicaInPipeline replica
// and if the old replica map contains any replica except ReplicaInPipeline
// then we didn't persist that replica
for (String bpid: bpidList) {
for (ReplicaInfo replicaInfo: oldReplicaMap.replicas(bpid)) {
if (replicaInfo.getState() != ReplicaState.TEMPORARY) {
Assert.fail("After datanode restart we lost the block with blockId: "
+ replicaInfo.getBlockId());
}
}
}
}
private void createReplicas(List<String> bpList, List<FsVolumeImpl> volumes,
ReplicaMap volumeMap) throws IOException {
Assert.assertTrue("Volume map can't be null" , volumeMap != null);
// Here we create all different type of replicas and add it
// to volume map.
// Created all type of ReplicaInfo, each under Blkpool corresponding volume
long id = 1; // This variable is used as both blockId and genStamp
for (String bpId: bpList) {
for (FsVolumeImpl volume: volumes) {
ReplicaInfo finalizedReplica = new FinalizedReplica(id, 1, id, volume,
DatanodeUtil.idToBlockDir(volume.getFinalizedDir(bpId), id));
volumeMap.add(bpId, finalizedReplica);
id++;
ReplicaInfo rbwReplica = new ReplicaBeingWritten(id, 1, id, volume,
volume.getRbwDir(bpId), null, 100);
volumeMap.add(bpId, rbwReplica);
id++;
ReplicaInfo rwrReplica = new ReplicaWaitingToBeRecovered(id, 1, id,
volume, volume.getRbwDir(bpId));
volumeMap.add(bpId, rwrReplica);
id++;
ReplicaInfo ripReplica = new ReplicaInPipeline(id, id, volume,
volume.getTmpDir(bpId), 0);
volumeMap.add(bpId, ripReplica);
id++;
}
}
for (String bpId: bpList) {
for (ReplicaInfo replicaInfo: volumeMap.replicas(bpId)) {
File parentFile = replicaInfo.getBlockFile().getParentFile();
if (!parentFile.exists()) {
if (!parentFile.mkdirs()) {
throw new IOException("Failed to mkdirs " + parentFile);
}
}
replicaInfo.getBlockFile().createNewFile();
replicaInfo.getMetaFile().createNewFile();
}
}
}
}

6
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestListCorruptFileBlocks.java
View File

@ -41,6 +41,8 @@ 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.HdfsConstants;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.util.StringUtils;
import org.junit.Test;
import org.slf4j.Logger;
@ -483,6 +485,10 @@ public class TestListCorruptFileBlocks {
}
}
// Run the direcrtoryScanner to update the Datanodes volumeMap
DataNode dn = cluster.getDataNodes().get(0);
DataNodeTestUtils.runDirectoryScanner(dn);
// Occasionally the BlockPoolSliceScanner can run before we have removed
// the blocks. Restart the Datanode to trigger the scanner into running
// once more.

3
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestProcessCorruptBlocks.java
View File

@ -33,6 +33,7 @@ import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSCluster.DataNodeProperties;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.blockmanagement.NumberReplicas;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.junit.Test;
public class TestProcessCorruptBlocks {
@ -269,6 +270,8 @@ public class TestProcessCorruptBlocks {
// But the datadirectory will not change
assertTrue(cluster.corruptReplica(dnIndex, block));
// Run directory scanner to update the DN's volume map
DataNodeTestUtils.runDirectoryScanner(cluster.getDataNodes().get(0));
DataNodeProperties dnProps = cluster.stopDataNode(0);
// Each datanode has multiple data dirs, check each

3
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestPendingCorruptDnMessages.java
View File

@ -36,6 +36,7 @@ import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.util.ThreadUtil;
import org.junit.Test;
@ -69,6 +70,8 @@ public class TestPendingCorruptDnMessages {
ExtendedBlock block = DFSTestUtil.getFirstBlock(fs, filePath);
assertTrue(cluster.changeGenStampOfBlock(0, block, 900));
// Run directory dsscanner to update Datanode's volumeMap
DataNodeTestUtils.runDirectoryScanner(cluster.getDataNodes().get(0));
// Stop the DN so the replica with the changed gen stamp will be reported
// when this DN starts up.
DataNodeProperties dnProps = cluster.stopDataNode(0);