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https://issues.apache.org/jira/browse/HBASE-6346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408463#comment-13408463
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Andrew Purtell edited comment on HBASE-6346 at 7/6/12 11:57 PM:
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See attached graph.gif what CPU use on the cluster looks like. Nothing should
be running, this is a Hadoop+HBase cluster started up and left alone. 'top' on
the hosts shows all CPU time used by the JVM running the regionserver.
Attached as runnable_cpu_profile.png is a snapshot of what jprofiler sees of a
2.0.1+0.94.1 HBase process started in-tree as './bin/hbase master start'. I've
also attached a stack dump so you can see it is doing "nothing".
Edit: I haven't missed that most of that time is system time. Wonder what is up
with that.
was (Author: apurtell):
See attached graph.gif what CPU use on the cluster looks like. Nothing
should be running, this is a Hadoop+HBase cluster started up and left alone.
'top' on the hosts shows all CPU time used by the JVM running the regionserver.
Attached as runnable_cpu_profile.png is a snapshot of what jprofiler sees of a
2.0.1+0.94.1 HBase process started in-tree as './bin/hbase master start'. I've
also attached a stack dump so you can see it is doing "nothing".
> Metrics updating may be using excessive CPU
> -------------------------------------------
>
> Key: HBASE-6346
> URL: https://issues.apache.org/jira/browse/HBASE-6346
> Project: HBase
> Issue Type: Bug
> Environment: Hadoop 2.0.1-alpha, HBase 0.94.1-SNAPSHOT
> Reporter: Andrew Purtell
> Attachments: graph.gif, jstack.txt, runnable_cpu_profile.png
>
>
> I've only started looking at this but became concerned when a completely
> quiescent cluster loads up 20% CPU (system+user) once HBase comes up.
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