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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10171) Coprocessor improvement
Date Mon, 16 Dec 2013 04:03:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848800#comment-13848800

Jingcheng Du commented on HBASE-10171:

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
> 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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