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https://issues.apache.org/jira/browse/HBASE-2861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-2861:
-------------------------
Priority: Critical (was: Blocker)
Changed from blocker to critical. Shouldn't hold up 0.90. Will document this
as known issue w/ hdfs-724 suggested workaround.
> regionserver's logsyncer thread hangs on
> DFSClient$DFSOutputStream.waitForAckedSeqno
> ------------------------------------------------------------------------------------
>
> Key: HBASE-2861
> URL: https://issues.apache.org/jira/browse/HBASE-2861
> Project: HBase
> Issue Type: Bug
> Reporter: Kannan Muthukkaruppan
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: jstack.txt
>
>
> During loads into HBase, we are noticing that a RS is sometimes getting stuck.
> The logSyncer thread:
> {code}
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.waitForAckedSeqno(DFSClient.java:3367)
> - locked <0x00002aaac7fef748> (a java.util.LinkedList)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.sync(DFSClient.java:3301)
> at
> org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:97)
> at
> org.apache.hadoop.io.SequenceFile$Writer.syncFs(SequenceFile.java:944)
> at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:124)
> at org.apache.hadoop.hbase.regionserver.wal.HLog.hflush(HLog.java:949)
> {code}
> A lot of other threads are stuck on:
> {code}
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
> at
> org.apache.hadoop.hbase.regionserver.wal.HLog$LogSyncer.addToSyncQueue(HLog.java:916)
> at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:936)
> at org.apache.hadoop.hbase.regionserver.wal.HLog.append(HLog.java:828)
> at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1657)
> at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1425)
> at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1393)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1665)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.multiPut(HRegionServer.java:2326)
> {code}
> Subsequently, trying to disable the table, which in turn attempts to close
> the region(s), caused internalFlushCache() also to get stuck here:
> {code}
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:807)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:974)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:511)
> - locked <0x00002aaab76af670> (a java.lang.Object)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:463)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.closeRegion(HRegionServer.java:1468)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer$Worker.run(HRegionServer.java:1329)
> {code}
> I'll attach the full jstack trace soon.
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