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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6496) Example ZK based scan policy
Date Thu, 02 Aug 2012 22:05:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427662#comment-13427662
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Andrew Purtell commented on HBASE-6496:
---------------------------------------

bq. How would that shared be exposed to a RegionObserver? Via the RegionCoprocessorEnvironment,
or the CoprocessorContext?

I was thinking addition to interface CoprocessorEnvironment or RegionCoprocessorEnvironment
and implementation in RegionCoprocessorHost.

Context is meant to hold state scoped to the invocation of a CP chain on a particular hook.
                
> Example ZK based scan policy
> ----------------------------
>
>                 Key: HBASE-6496
>                 URL: https://issues.apache.org/jira/browse/HBASE-6496
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 6496.txt
>
>
> Provide an example of a RegionServer that listens to a ZK node to learn about what set
of KVs can safely be deleted during a compaction.

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