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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10355) Failover RPC's from client using region replicas
Date Thu, 20 Feb 2014 02:07:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906488#comment-13906488
] 

Enis Soztutar commented on HBASE-10355:
---------------------------------------

While testing this (v1 patch) with HBASE-10572, I noticed some of the reader threads are stuck
in: 
{code}
"TimeBoundedMultiThreadedReaderThread_13" prio=10 tid=0x00007fafd02ed000 nid=0x4a3e waiting
on condition [0x00007fafc1799000]
	   java.lang.Thread.State: WAITING (parking)
		at sun.misc.Unsafe.park(Native Method)
		- parking to wait for  <0x00000000bd6d2520> (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.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
		at java.util.concurrent.ExecutorCompletionService.take(ExecutorCompletionService.java:193)
		at org.apache.hadoop.hbase.client.RpcRetryingCallerWithFallBack.call(RpcRetryingCallerWithFallBack.java:183)
		- locked <0x00000000bd6d25c0> (a org.apache.hadoop.hbase.client.RpcRetryingCallerWithFallBack)
		at org.apache.hadoop.hbase.client.HTable.get(HTable.java:821)
		at org.apache.hadoop.hbase.util.MultiThreadedReader$HBaseReaderThread.queryKey(MultiThreadedReader.java:286)
		at org.apache.hadoop.hbase.util.MultiThreadedReader$HBaseReaderThread.readKey(MultiThreadedReader.java:247)
		at org.apache.hadoop.hbase.util.MultiThreadedReader$HBaseReaderThread.runReader(MultiThreadedReader.java:190)
		at org.apache.hadoop.hbase.util.MultiThreadedReader$HBaseReaderThread.run(MultiThreadedReader.java:148)
{code}
I am still looking into the root cause, but just wanted to give a heads up. Maybe the CompletionService
in v2 solves this, but have not checked it yet. 


> Failover RPC's from client using region replicas
> ------------------------------------------------
>
>                 Key: HBASE-10355
>                 URL: https://issues.apache.org/jira/browse/HBASE-10355
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>            Reporter: Enis Soztutar
>            Assignee: Nicolas Liochon
>             Fix For: 0.99.0
>
>         Attachments: 10355.v1.patch, 10355.v2.patch
>
>




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