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HDFS-9445. Datanode may deadlock while handling a bad volume. Contributed by Walter Su. 

(cherry picked from commit a48301791e)
This commit is contained in:
Kihwal Lee 2015-12-11 08:46:03 -06:00
parent 7dc558b6a7
commit a72ef921f0
3 changed files with 58 additions and 36 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1709,6 +1709,9 @@ Release 2.7.2 - UNRELEASED
HDFS-9294. DFSClient deadlock when close file and failed to renew lease.
(Brahma Reddy Battula via szetszwo)
HDFS-9445. Datanode may deadlock while handling a bad volume.
(Wlater Su via Kihwal)
Release 2.7.1 - 2015-07-06
INCOMPATIBLE CHANGES

87
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
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@ -475,48 +475,67 @@ public void addVolume(final StorageLocation location,
* Removes a set of volumes from FsDataset.
* @param volumesToRemove a set of absolute root path of each volume.
* @param clearFailure set true to clear failure information.
*
* DataNode should call this function before calling
* {@link DataStorage#removeVolumes(java.util.Collection)}.
*/
@Override
public synchronized void removeVolumes(
Set<File> volumesToRemove, boolean clearFailure) {
public void removeVolumes(Set<File> volumesToRemove, boolean clearFailure) {
// Make sure that all volumes are absolute path.
for (File vol : volumesToRemove) {
Preconditions.checkArgument(vol.isAbsolute(),
String.format("%s is not absolute path.", vol.getPath()));
}
for (int idx = 0; idx < dataStorage.getNumStorageDirs(); idx++) {
Storage.StorageDirectory sd = dataStorage.getStorageDir(idx);
final File absRoot = sd.getRoot().getAbsoluteFile();
if (volumesToRemove.contains(absRoot)) {
LOG.info("Removing " + absRoot + " from FsDataset.");
// Disable the volume from the service.
asyncDiskService.removeVolume(sd.getCurrentDir());
volumes.removeVolume(absRoot, clearFailure);
Map<String, List<ReplicaInfo>> blkToInvalidate = new HashMap<>();
List<String> storageToRemove = new ArrayList<>();
synchronized (this) {
for (int idx = 0; idx < dataStorage.getNumStorageDirs(); idx++) {
Storage.StorageDirectory sd = dataStorage.getStorageDir(idx);
final File absRoot = sd.getRoot().getAbsoluteFile();
if (volumesToRemove.contains(absRoot)) {
LOG.info("Removing " + absRoot + " from FsDataset.");
// Removed all replica information for the blocks on the volume. Unlike
// updating the volumeMap in addVolume(), this operation does not scan
// disks.
for (String bpid : volumeMap.getBlockPoolList()) {
for (Iterator<ReplicaInfo> it = volumeMap.replicas(bpid).iterator();
it.hasNext(); ) {
ReplicaInfo block = it.next();
final File absBasePath =
new File(block.getVolume().getBasePath()).getAbsoluteFile();
if (absBasePath.equals(absRoot)) {
invalidate(bpid, block);
it.remove();
// Disable the volume from the service.
asyncDiskService.removeVolume(sd.getCurrentDir());
volumes.removeVolume(absRoot, clearFailure);
// Removed all replica information for the blocks on the volume.
// Unlike updating the volumeMap in addVolume(), this operation does
// not scan disks.
for (String bpid : volumeMap.getBlockPoolList()) {
List<ReplicaInfo> blocks = new ArrayList<>();
for (Iterator<ReplicaInfo> it = volumeMap.replicas(bpid).iterator();
it.hasNext(); ) {
ReplicaInfo block = it.next();
final File absBasePath =
new File(block.getVolume().getBasePath()).getAbsoluteFile();
if (absBasePath.equals(absRoot)) {
blocks.add(block);
it.remove();
}
}
blkToInvalidate.put(bpid, blocks);
}
}
storageMap.remove(sd.getStorageUuid());
storageToRemove.add(sd.getStorageUuid());
}
}
setupAsyncLazyPersistThreads();
}
// Call this outside the lock.
for (Map.Entry<String, List<ReplicaInfo>> entry :
blkToInvalidate.entrySet()) {
String bpid = entry.getKey();
List<ReplicaInfo> blocks = entry.getValue();
for (ReplicaInfo block : blocks) {
invalidate(bpid, block);
}
}
synchronized (this) {
for(String storageUuid : storageToRemove) {
storageMap.remove(storageUuid);
}
}
setupAsyncLazyPersistThreads();
}
private StorageType getStorageTypeFromLocations(
@ -1936,15 +1955,11 @@ public void invalidate(String bpid, Block invalidBlks[]) throws IOException {
public void invalidate(String bpid, ReplicaInfo block) {
// If a DFSClient has the replica in its cache of short-circuit file
// descriptors (and the client is using ShortCircuitShm), invalidate it.
// The short-circuit registry is null in the unit tests, because the
// datanode is mock object.
if (datanode.getShortCircuitRegistry() != null) {
datanode.getShortCircuitRegistry().processBlockInvalidation(
new ExtendedBlockId(block.getBlockId(), bpid));
datanode.getShortCircuitRegistry().processBlockInvalidation(
new ExtendedBlockId(block.getBlockId(), bpid));
// If the block is cached, start uncaching it.
cacheManager.uncacheBlock(bpid, block.getBlockId());
}
// If the block is cached, start uncaching it.
cacheManager.uncacheBlock(bpid, block.getBlockId());
datanode.notifyNamenodeDeletedBlock(new ExtendedBlock(bpid, block),
block.getStorageUuid());

4
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java
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@ -39,6 +39,7 @@
import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
import org.apache.hadoop.hdfs.server.datanode.ReplicaHandler;
import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
import org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry;
import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
@ -147,6 +148,9 @@ public void setUp() throws IOException {
when(datanode.getDnConf()).thenReturn(dnConf);
final BlockScanner disabledBlockScanner = new BlockScanner(datanode, conf);
when(datanode.getBlockScanner()).thenReturn(disabledBlockScanner);
final ShortCircuitRegistry shortCircuitRegistry =
new ShortCircuitRegistry(conf);
when(datanode.getShortCircuitRegistry()).thenReturn(shortCircuitRegistry);
createStorageDirs(storage, conf, NUM_INIT_VOLUMES);
dataset = new FsDatasetImpl(datanode, storage, conf);