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From "Kirubakaran Pakkirisamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9410) Concurrent coprocessor endpoint executions slow down exponentially
Date Fri, 06 Sep 2013 02:41:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759789#comment-13759789
] 

Kirubakaran Pakkirisamy commented on HBASE-9410:
------------------------------------------------

Andrew et al, were you able to recreate the problem with the attached test case ? It just
needs a table with as many as regions as (atleast) the total number of cores in the cluster.
It could be any table and I dont think the region size matters. Seems like some unnecessary/aggressive
locking overhead.
                
> 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: jstack1.log, jstack2.log, jstack3.log, 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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