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https://issues.apache.org/jira/browse/HBASE-4011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052283#comment-13052283
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Andrew Purtell commented on HBASE-4011:
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+1 on patch. Code is safe in that nothing happens if no MasterObserver is
registered and exceptions in the CP won't kill the master.
> 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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