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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4011) New MasterObserver hook: post startup of active master
Date Tue, 28 Jun 2011 22:43:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13056858#comment-13056858
] 

Hudson commented on HBASE-4011:
-------------------------------

Integrated in HBase-TRUNK #1995 (See [https://builds.apache.org/job/HBase-TRUNK/1995/])
    

> New MasterObserver hook: post startup of active master
> ------------------------------------------------------
>
>                 Key: HBASE-4011
>                 URL: https://issues.apache.org/jira/browse/HBASE-4011
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors
>            Reporter: Gary Helmling
>            Assignee: Gary Helmling
>             Fix For: 0.92.0
>
>         Attachments: HBASE-4011.patch
>
>
> In working on security, we've found a need for a new notification point: completion of
startup for an active master instance.  The idea is that this would be called at the end of
{{HMaster.finishInitialization()}}, after ROOT and META have been assigned as a signal that
the master is essentially "up" and available.
> So I propose that we add the following to {{MasterObserver}}:
> {code}
> /**
>  * Called immediately after an active master instance has completed
>  * initialization.  Will not be called on standby master instances unless
>  * they take over the active role.
>  */
> void postStartMaster(final ObserverContext<MasterCoprocessorEnvironment> ctx)
>     throws IOException;
> {code}
> As an example, in the case of the security implementation, we want to use this hook to
check whether the {{\_acl\_}} table we use to store permission assignments internally have
been created and initialized.

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