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https://issues.apache.org/jira/browse/HBASE-9410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755805#comment-13755805
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Andrew Purtell commented on HBASE-9410:
---------------------------------------

Looks like you configured 1000 IPC handlers? This should be set to 
approximately the number of cores and spindles of the server hardware. 

Scrolling through some of that 7 MB log (can you attach only one jstack you 
think is relevant?) I don't see any IPC handlers doing any work, but it's too 
big to look at in total.
                
> Concurrent coprocessor endpoint executions slow down exponentially
> ------------------------------------------------------------------
>
>                 Key: HBASE-9410
>                 URL: https://issues.apache.org/jira/browse/HBASE-9410
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors
>    Affects Versions: 0.94.11
>         Environment: Amazon ec2
>            Reporter: Kirubakaran Pakkirisamy
>         Attachments: jstack.log, SearchEndpoint.java, Search.java, 
> SearchProtocol.java
>
>
> Multiple concurrent executions of coprocessor endpoints slow down 
> drastically. It is compounded further when there are more Htable connection 
> setups happening.

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