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https://issues.apache.org/jira/browse/HBASE-13971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14721214#comment-14721214
]
stack commented on HBASE-13971:
-------------------------------
Did this patch work for you [~abhilak]? Thanks.
> Flushes stuck since 6 hours on a regionserver.
> ----------------------------------------------
>
> Key: HBASE-13971
> URL: https://issues.apache.org/jira/browse/HBASE-13971
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 1.3.0
> Environment: Caused while running IntegrationTestLoadAndVerify for 20
> M rows on cluster with 32 region servers each with max heap size of 24GBs.
> Reporter: Abhilash
> Assignee: Ted Yu
> Priority: Critical
> Fix For: 2.0.0, 1.2.0, 1.3.0
>
> Attachments: 13971-v1.txt, 13971-v1.txt, 13971-v1.txt, jstack.1,
> jstack.2, jstack.3, jstack.4, jstack.5, rsDebugDump.txt, screenshot-1.png
>
>
> One region server stuck while flushing(possible deadlock). Its trying to
> flush two regions since last 6 hours (see the screenshot).
> Caused while running IntegrationTestLoadAndVerify for 20 M rows with 600
> mapper jobs and 100 back references. ~37 Million writes on each regionserver
> till now but no writes happening on any regionserver from past 6 hours and
> their memstore size is zero(I dont know if this is related). But this
> particular regionserver has memstore size of 9GBs from past 6 hours.
> Relevant snaps from debug dump:
> Tasks:
> ===========================================================
> Task: Flushing
> IntegrationTestLoadAndVerify,R\x9B\x1B\xBF\xAE\x08\xD1\xA2,1435179555993.8e2d075f94ce7699f416ec4ced9873cd.
> Status: RUNNING:Preparing to flush by snapshotting stores in
> 8e2d075f94ce7699f416ec4ced9873cd
> Running for 22034s
> Task: Flushing
> IntegrationTestLoadAndVerify,\x93\xA385\x81Z\x11\xE6,1435179555993.9f8d0e01a40405b835bf6e5a22a86390.
> Status: RUNNING:Preparing to flush by snapshotting stores in
> 9f8d0e01a40405b835bf6e5a22a86390
> Running for 22033s
> Executors:
> ===========================================================
> ...
> Thread 139 (MemStoreFlusher.1):
> State: WAITING
> Blocked count: 139711
> Waited count: 239212
> Waiting on java.util.concurrent.CountDownLatch$Sync@b9c094a
> Stack:
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> org.apache.hadoop.hbase.wal.WALKey.getSequenceId(WALKey.java:305)
>
> org.apache.hadoop.hbase.regionserver.HRegion.getNextSequenceId(HRegion.java:2422)
>
> org.apache.hadoop.hbase.regionserver.HRegion.internalPrepareFlushCache(HRegion.java:2168)
>
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2047)
>
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2011)
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1902)
> org.apache.hadoop.hbase.regionserver.HRegion.flush(HRegion.java:1828)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:510)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:471)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$900(MemStoreFlusher.java:75)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:259)
> java.lang.Thread.run(Thread.java:745)
> Thread 137 (MemStoreFlusher.0):
> State: WAITING
> Blocked count: 138931
> Waited count: 237448
> Waiting on java.util.concurrent.CountDownLatch$Sync@53f41f76
> Stack:
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> org.apache.hadoop.hbase.wal.WALKey.getSequenceId(WALKey.java:305)
>
> org.apache.hadoop.hbase.regionserver.HRegion.getNextSequenceId(HRegion.java:2422)
>
> org.apache.hadoop.hbase.regionserver.HRegion.internalPrepareFlushCache(HRegion.java:2168)
>
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2047)
>
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2011)
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1902)
> org.apache.hadoop.hbase.regionserver.HRegion.flush(HRegion.java:1828)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:510)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:471)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$900(MemStoreFlusher.java:75)
>
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:259)
> java.lang.Thread.run(Thread.java:745)
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