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From "Gary Helmling (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4477) Ability for an application to store metadata into the transaction log
Date Thu, 29 Sep 2011 18:31:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117507#comment-13117507
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Gary Helmling commented on HBASE-4477:
--------------------------------------

+1 on coprocessorPut2.txt, which just removes the unused familyMap local vars in RegionCoprocessorHost.

I'm curious about the cluster ID question as well though.  Don't know enough about the replication
stuff to understand the current usage.
                
> Ability for an application to store metadata into the transaction log
> ---------------------------------------------------------------------
>
>                 Key: HBASE-4477
>                 URL: https://issues.apache.org/jira/browse/HBASE-4477
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: coprocessorPut1.txt, coprocessorPut2.txt, hlogMetadata1.txt
>
>
> mySQL allows an application to store an arbitrary blob along with each transaction in
its transaction logs. This JIRA is to have a similar feature request for HBASE.
> The use case is as follows: An application on one data center A stores a blob of data
along with each transaction. A replication software picks up these blobs from the transaction
logs in A and hands it to another instance of the same application running on a remote data
center B. The application in B is responsible for applying this to the remote Hbase cluster
(and also handle conflict resolution if any).

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