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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7374) Expose master table operations for coprocessors by way of MasterServices
Date Tue, 18 Dec 2012 03:32:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13534595#comment-13534595
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Andrew Purtell commented on HBASE-7374:
---------------------------------------

[~enis] Thanks for the heads up on HBASE-7305. You're right, the ops executed via MasterServices
would operate under a table lock taken before a preXXX or postXXX upcall into the master CP.
Hmm.
                
> Expose master table operations for coprocessors by way of MasterServices
> ------------------------------------------------------------------------
>
>                 Key: HBASE-7374
>                 URL: https://issues.apache.org/jira/browse/HBASE-7374
>             Project: HBase
>          Issue Type: Improvement
>          Components: Coprocessors, master
>    Affects Versions: 0.96.0, 0.94.4
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>         Attachments: HBASE-7374-0.94.patch, HBASE-7374.patch
>
>
> I have something I'm working on that, as a coprocessor, when it initializes would like
to add a column to a table should that column be missing. Exposing master table operations
for coprocessors by way of MasterServices was how I solved this problem, and is generally
useful for all master coprocessors.

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