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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7950) Repeated requests to regionserver JMX metrics crashes regionserver
Date Wed, 27 Feb 2013 05:42:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13588025#comment-13588025
] 

Ted Yu commented on HBASE-7950:
-------------------------------

@Yousuf:
Thanks for trying out 0.95 so early.

Your experience would help us refine the release.
                
> Repeated requests to regionserver JMX metrics crashes regionserver
> ------------------------------------------------------------------
>
>                 Key: HBASE-7950
>                 URL: https://issues.apache.org/jira/browse/HBASE-7950
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.95.0
>         Environment: Linux 2.6.38-16-generic-pae #67-Ubuntu SMP i686 i686 i386 GNU/Linux
> java-6-openjdk
>            Reporter: Yousuf Ahmad
>            Priority: Minor
>         Attachments: regionserver.log
>
>
> Making repeated requests (e.g., every 10 seconds) to the regionserver JMX metrics servlet
crashes the regionserver. It will serve several requests correctly but then throw an exception
upon the next request and then crash.
> I can reproduce the error using a bash loop that will wget the /jmx servlet every 2 seconds.
My regionserver ultimately crashes within a few minutes.
> The regionserver log shows these exceptions (grep "Caused by"):
> {noformat}
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 177
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.NullPointerException
> Caused by: java.lang.NullPointerException
> Caused by: java.lang.NullPointerException
> Caused by: java.lang.NullPointerException
> Caused by: java.lang.NullPointerException
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 8192
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 159785336
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 159869880
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.InternalError: Unsupported VMGlobal Type 0
> Caused by: java.lang.NullPointerException
> {noformat}

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