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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Created] (OAK-7867) Flush thread gets stuck when input stream of binaries block
Date Mon, 29 Oct 2018 14:45:25 GMT
Michael Dürig created OAK-7867:
----------------------------------

             Summary: Flush thread gets stuck when input stream of binaries block
                 Key: OAK-7867
                 URL: https://issues.apache.org/jira/browse/OAK-7867
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: segment-tar
            Reporter: Michael Dürig
            Assignee: Michael Dürig
             Fix For: 1.10


This issue tackles the root cause of the sever data loss that has been reported in OAK-7852:

When a the input stream of a binary value blocks indefinitely on read the flush thread of
the segment store get blocked:
{noformat}
"pool-2-thread-1" #15 prio=5 os_prio=31 tid=0x00007fb0f21e3000 nid=0x5f03 waiting on condition
[0x000070000a46d000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for  <0x000000076bba62b0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at com.google.common.util.concurrent.Monitor.await(Monitor.java:963)
at com.google.common.util.concurrent.Monitor.enterWhen(Monitor.java:402)
at org.apache.jackrabbit.oak.segment.SegmentBufferWriterPool.safeEnterWhen(SegmentBufferWriterPool.java:179)
at org.apache.jackrabbit.oak.segment.SegmentBufferWriterPool.flush(SegmentBufferWriterPool.java:138)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter.flush(DefaultSegmentWriter.java:138)
at org.apache.jackrabbit.oak.segment.file.FileStore.lambda$doFlush$8(FileStore.java:307)
at org.apache.jackrabbit.oak.segment.file.FileStore$$Lambda$22/1345968304.flush(Unknown Source)
at org.apache.jackrabbit.oak.segment.file.TarRevisions.doFlush(TarRevisions.java:237)
at org.apache.jackrabbit.oak.segment.file.TarRevisions.flush(TarRevisions.java:195)
at org.apache.jackrabbit.oak.segment.file.FileStore.doFlush(FileStore.java:306)
at org.apache.jackrabbit.oak.segment.file.FileStore.flush(FileStore.java:318)
{noformat}
The condition {{0x000070000a46d000}} is waiting for the following thread to return its {{SegmentBufferWriter}},
which will never happen if {{InputStream.read(...)}} does not progress.
{noformat}
"pool-1-thread-1" #14 prio=5 os_prio=31 tid=0x00007fb0f223a800 nid=0x5d03 runnable [0x000070000a369000
] java.lang.Thread.State: RUNNABLE
at com.google.common.io.ByteStreams.read(ByteStreams.java:833)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.internalWriteStream(DefaultSegmentWriter.java:641)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.writeStream(DefaultSegmentWriter.java:618)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.writeBlob(DefaultSegmentWriter.java:577)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.writeProperty(DefaultSegmentWriter.java:691)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.writeProperty(DefaultSegmentWriter.java:677)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.writeNodeUncached(DefaultSegmentWriter.java:900)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.writeNode(DefaultSegmentWriter.java:799)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$SegmentWriteOperation.access$800(DefaultSegmentWriter.java:252)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter$8.execute(DefaultSegmentWriter.java:240)
at org.apache.jackrabbit.oak.segment.SegmentBufferWriterPool.execute(SegmentBufferWriterPool.java:105)
at org.apache.jackrabbit.oak.segment.DefaultSegmentWriter.writeNode(DefaultSegmentWriter.java:235)
at org.apache.jackrabbit.oak.segment.SegmentWriter.writeNode(SegmentWriter.java:79)
{noformat}
 

This issue is critical as such a misbehaving input stream causes the flush thread to get stuck
preventing transient segments from being flushed and thus causing data loss.

 



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