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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-13942) HBase client stalls during region split when client threads > hbase.hconnection.threads.max
Date Mon, 13 Feb 2017 19:25:42 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Enis Soztutar resolved HBASE-13942.
-----------------------------------
       Resolution: Not A Problem
    Fix Version/s:     (was: 1.1.0)

> HBase client stalls during region split when client threads > hbase.hconnection.threads.max
> -------------------------------------------------------------------------------------------
>
>                 Key: HBASE-13942
>                 URL: https://issues.apache.org/jira/browse/HBASE-13942
>             Project: HBase
>          Issue Type: Bug
>          Components: Client, regionserver
>    Affects Versions: 1.0.0
>            Reporter: Mukund Murrali
>
> Performing any operataion using a single hconnection with client threads > hbase.hconnection.threads.max
causing the client to stall indefinetly during first region split. All the hconnection threads
in client side are waiting with the following stack. 
> hconnection-0x648a83fd-shared--pool1-t8" daemon prio=10 tid=0x00007f447c003800 nid=0x62ff
waiting on condition [0x00007f44c72f0000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000007d768bdf0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
>         at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:374)
>         at org.apache.hadoop.hbase.util.BoundedCompletionService.take(BoundedCompletionService.java:74)
>         at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:174)
>         at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:56)
>         at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
>         at org.apache.hadoop.hbase.client.ClientSmallReversedScanner.next(ClientSmallReversedScanner.java:145)
>         at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1200)
>         at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1109)
>         at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl.findAllLocationsOrFail(AsyncProcess.java:916)
>         at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl.groupAndSendMultiAction(AsyncProcess.java:833)
>         at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl.resubmit(AsyncProcess.java:1156)
>         at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl.receiveMultiAction(AsyncProcess.java:1296)
>         at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl.access$1200(AsyncProcess.java:574)
>         at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl$SingleServerRequestRunnable.run(AsyncProcess.java:716)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>         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:745)
>  



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