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Posted to issues@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2011/06/21 01:34:47 UTC
[jira] [Updated] (HBASE-4011) New MasterObserver hook: post startup
of active master
[ https://issues.apache.org/jira/browse/HBASE-4011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Purtell updated HBASE-4011:
----------------------------------
Fix Version/s: 0.92.0
Assignee: Gary Helmling
+1
> 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
>
>
> 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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