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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7042) Master Coprocessor Endpoint
Date Thu, 01 Nov 2012 15:21:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488753#comment-13488753
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Andrew Purtell commented on HBASE-7042:
---------------------------------------

It is possible to reuse Exec and ExecResult. Just ignore / don't set the row fields etc. Having
separate classes for master exec only is not a clean API in my opinion. 

The issue I see with supporting only system coprocessors is it requires deployment by way
of XML config update as the sole option, which requires a process restart. Table CPs can be
deployed to HDFS and then loaded dynamically with a schema update without needing to stop
any process. Not supporting this latter option on the master seems a shortcut and limiting. 
                
> Master Coprocessor Endpoint
> ---------------------------
>
>                 Key: HBASE-7042
>                 URL: https://issues.apache.org/jira/browse/HBASE-7042
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Francis Liu
>            Assignee: Francis Liu
>             Fix For: 0.96.0
>
>         Attachments: HBASE-7042_94.patch
>
>
> Having support for a master coprocessor endpoint would enable developers to easily extended
HMaster functionality/features. As is the case for region server grouping.

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