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From "Suguru Namura (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4578) Dead lock in mutation stage when many concurrent writes to few columns
Date Mon, 27 Aug 2012 04:47:08 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suguru Namura updated CASSANDRA-4578:
-------------------------------------

    Attachment: threaddump-1344957574788.tdump

Attached thread dump
                
> Dead lock in mutation stage when many concurrent writes to few columns
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-4578
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4578
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.3
>         Environment: 15 cassandra instances
> CentOS5
> 8 Core 64GB Memory
> java version "1.6.0_33"
> Java(TM) SE Runtime Environment (build 1.6.0_33-b04)
> Java HotSpot(TM) 64-Bit Server VM (build 20.8-b03, mixed mode)
>            Reporter: Suguru Namura
>         Attachments: threaddump-1344957574788.tdump
>
>
> When I send many request to increment counters to few counter columns, sometimes mutation
stage cause dead lock. When it happened, all of mutation threads are locked and do not accept
updates any more.
> {noformat}
> "MutationStage:432" - Thread t@1389
>    java.lang.Thread.State: TIMED_WAITING
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <b90b45b> (a org.apache.cassandra.utils.SimpleCondition)
> 	at java.lang.Object.wait(Object.java:443)
> 	at java.util.concurrent.TimeUnit.timedWait(TimeUnit.java:292)
> 	at org.apache.cassandra.utils.SimpleCondition.await(SimpleCondition.java:54)
> 	at org.apache.cassandra.service.AbstractWriteResponseHandler.get(AbstractWriteResponseHandler.java:55)
> 	at org.apache.cassandra.db.CounterMutationVerbHandler.doVerb(CounterMutationVerbHandler.java:51)
> 	at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:59)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:662)
>    Locked ownable synchronizers:
> 	- locked <4b1b0a6f> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
> {noformat}

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