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HDFS-5657. Merging change r1551691 from trunk 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1551705 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Brandon Li 2013-12-17 21:01:33 +00:00
parent 88d09130e8
commit c143486c17
2 changed files with 20 additions and 3 deletions
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21
hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/OpenFileCtx.java
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@ -85,6 +85,7 @@ class OpenFileCtx {
private volatile boolean activeState; private volatile boolean activeState;
// The stream write-back status. True means one thread is doing write back. // The stream write-back status. True means one thread is doing write back.
private volatile boolean asyncStatus; private volatile boolean asyncStatus;
private volatile long asyncWriteBackStartOffset;
/** /**
* The current offset of the file in HDFS. All the content before this offset * The current offset of the file in HDFS. All the content before this offset
@ -209,6 +210,7 @@ class OpenFileCtx {
updateLastAccessTime(); updateLastAccessTime();
activeState = true; activeState = true;
asyncStatus = false; asyncStatus = false;
asyncWriteBackStartOffset = 0;
dumpOut = null; dumpOut = null;
raf = null; raf = null;
nonSequentialWriteInMemory = new AtomicLong(0); nonSequentialWriteInMemory = new AtomicLong(0);
@ -582,6 +584,7 @@ class OpenFileCtx {
+ nextOffset.get()); + nextOffset.get());
} }
asyncStatus = true; asyncStatus = true;
asyncWriteBackStartOffset = writeCtx.getOffset();
asyncDataService.execute(new AsyncDataService.WriteBackTask(this)); asyncDataService.execute(new AsyncDataService.WriteBackTask(this));
} else { } else {
if (LOG.isDebugEnabled()) { if (LOG.isDebugEnabled()) {
@ -911,9 +914,11 @@ class OpenFileCtx {
/** Invoked by AsynDataService to write back to HDFS */ /** Invoked by AsynDataService to write back to HDFS */
void executeWriteBack() { void executeWriteBack() {
Preconditions.checkState(asyncStatus, Preconditions.checkState(asyncStatus,
"The openFileCtx has false async status"); "openFileCtx has false asyncStatus, fileId:" + latestAttr.getFileid());
final long startOffset = asyncWriteBackStartOffset;
try { try {
while (activeState) { while (activeState) {
// asyncStatus could be changed to false in offerNextToWrite()
WriteCtx toWrite = offerNextToWrite(); WriteCtx toWrite = offerNextToWrite();
if (toWrite != null) { if (toWrite != null) {
// Do the write // Do the write
@ -929,8 +934,18 @@ class OpenFileCtx {
+ latestAttr.getFileId()); + latestAttr.getFileId());
} }
} finally { } finally {
// make sure we reset asyncStatus to false // Make sure to reset asyncStatus to false unless a race happens
asyncStatus = false; synchronized (this) {
if (startOffset == asyncWriteBackStartOffset) {
asyncStatus = false;
} else {
LOG.info("Another asyn task is already started before this one"
+ " is finalized. fileId:" + latestAttr.getFileid()
+ " asyncStatus:" + asyncStatus + " original startOffset:"
+ startOffset + " new startOffset:" + asyncWriteBackStartOffset
+ ". Won't change asyncStatus here.");
}
}
} }
} }

2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -392,6 +392,8 @@ Release 2.3.0 - UNRELEASED
HDFS-5666. Fix inconsistent synchronization in BPOfferService (jxiang via cmccabe) HDFS-5666. Fix inconsistent synchronization in BPOfferService (jxiang via cmccabe)
HDFS-5657. race condition causes writeback state error in NFS gateway (brandonli)
Release 2.2.0 - 2013-10-13 Release 2.2.0 - 2013-10-13
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES