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https://issues.apache.org/jira/browse/HBASE-10171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848800#comment-13848800
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Jingcheng Du commented on HBASE-10171:
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[~apurtell]
Thanks Andy, supplement more descriptions in the umbrella JIRA.
> Coprocessor improvement
> -----------------------
>
> Key: HBASE-10171
> URL: https://issues.apache.org/jira/browse/HBASE-10171
> Project: HBase
> Issue Type: New Feature
> Components: Coprocessors
> Affects Versions: 0.99.0
> Reporter: Jingcheng Du
> Assignee: Jingcheng Du
>
> This umbrella JIRA includes some improvements of the coprocessor which are
> listed as following.
> 1. Batch coprocessor: Group the executions issued to the same region server
> to reduce the thread cost in the client side.
> 2. Coprocessor task monitor: Facilitate the monitoring of the coprocessor
> task in the server side. This patch depends on the one of the batch
> coprocessor since coprocessor task monitor includes the batched coprocessor
> tasks into the monitoring.
> 3. Add a state checker for the coprocessor task: If the execution in the
> coprocessor task is too long, the call in the client side will be timed out.
> After that the client will retry, the timeout and retry will happen again and
> again, which leads to even heavier pressure on the servers and thus to a
> worse situation. This state checker could avoid the retry if the coprocessor
> tasks are still in progress in the server side. This patch will be provided
> later and it depends on the ones of batch coprocessor and coprocessor task
> monitor since it uses the client of the coprocessor task monitor to
> communicate with the coprocessor task monitor in the server side and provides
> the support to the batch coprocessor.
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