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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16429) FSHLog: deadlock if rollWriter called when ring buffer filled with appends
Date Thu, 18 Aug 2016 08:20:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15426079#comment-15426079
] 

Hudson commented on HBASE-16429:
--------------------------------

SUCCESS: Integrated in Jenkins build HBase-1.1-JDK8 #1852 (See [https://builds.apache.org/job/HBase-1.1-JDK8/1852/])
HBASE-16429 FSHLog: deadlock if rollWriter called when ring buffer (liyu: rev b3d69bc029a3b8a4db29b3c266c16643108938dd)
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java


> FSHLog: deadlock if rollWriter called when ring buffer filled with appends
> --------------------------------------------------------------------------
>
>                 Key: HBASE-16429
>                 URL: https://issues.apache.org/jira/browse/HBASE-16429
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.1.2, 1.2.2
>            Reporter: Yu Li
>            Assignee: Yu Li
>            Priority: Critical
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 1.2.3, 1.1.7
>
>         Attachments: HBASE-16429.patch
>
>
> Recently we experienced an online problem that all handlers are stuck. Checking the jstack
we could see all handler threads waiting for RingBuffer.next, while the single ring buffer
consumer dead waiting for {{safePointReleasedLatch}} to count down:
> {noformat}
> Normal handler thread:
> "B.defaultRpcServer.handler=126,queue=9,port=16020" daemon prio=10 tid=0x00007efd4b44f800
nid=0x15f29 runnable [0x00007efd3db7b000]
>    java.lang.Thread.State: TIMED_WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:349)
>         at com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:136)
>         at com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:105)
>         at com.lmax.disruptor.RingBuffer.next(RingBuffer.java:246)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog.append(FSHLog.java:1222)
>         at org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchMutation(HRegion.java:3188)
>         at org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:2879)
>         at org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:2819)
>         at org.apache.hadoop.hbase.regionserver.RSRpcServices.doBatchOp(RSRpcServices.java:736)
>         at org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicRegionMutation(RSRpcServices.java:698)
>         at org.apache.hadoop.hbase.regionserver.RSRpcServices.multi(RSRpcServices.java:2095)
>         at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32213)
>         at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:774)
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:102)
>         at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
>         at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
>         at java.lang.Thread.run(Thread.java:756)
> RingBufferEventHandler thread waiting for safePointReleasedLatch:
> "regionserver/hadoop0369.et2.tbsite.net/11.251.152.226:16020.append-pool2-t1" prio=10
tid=0x00007efd320d0000 nid=0x1777b waiting on condition [0x00007efd2d2fa000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00007f01b48d9178> (a java.util.concurrent.CountDownLatch$Sync)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
>         at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog$SafePointZigZagLatch.safePointAttained(FSHLog.java:1866)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog$RingBufferEventHandler.attainSafePoint(FSHLog.java:2066)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog$RingBufferEventHandler.onEvent(FSHLog.java:2029)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog$RingBufferEventHandler.onEvent(FSHLog.java:1909)
>         at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:128)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at java.lang.Thread.run(Thread.java:756)
> {noformat} 
> {{FSHLog#replaceWriter}} will call {{SafePointZigZagLatch#releaseSafePoint}} to count
down {{safePointReleasedLatch}}, but replaceWriter got stuck when trying to publish a sync
onto ring buffer:
> {noformat}
> "regionserver/hadoop0369.et2.tbsite.net/11.251.152.226:16020.logRoller" daemon prio=10
tid=0x00007efd320c8800 nid=0x16123 runnable [0x00007efd311f6000]
>    java.lang.Thread.State: TIMED_WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:349)
>         at com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:136)
>         at com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:105)
>         at com.lmax.disruptor.RingBuffer.next(RingBuffer.java:246)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog.publishSyncOnRingBuffer(FSHLog.java:1481)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog.publishSyncOnRingBuffer(FSHLog.java:1477)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog.replaceWriter(FSHLog.java:957)
>         at org.apache.hadoop.hbase.regionserver.wal.FSHLog.rollWriter(FSHLog.java:726)
>         at org.apache.hadoop.hbase.regionserver.LogRoller.run(LogRoller.java:148)
>         at java.lang.Thread.run(Thread.java:756)
> {noformat}
> Thus deadlock happens.
> A brief process of how deadlock forms:
> {noformat}
> ring buffer filled with appends
> -> rollWriter happens
> -> the only consumer of ring buffer waiting for safePointReleasedLatch
> -> rollWriter cannot publish sync since ring buffer is full
> -> rollWriter won't release safePointReleasedLatch
> {noformat}
> This JIRA targeting at resolve this issue, and will add a UT to cover the case



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