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From "Jonathan Gray (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4477) Ability for an application to store metadata into the transaction log
Date Mon, 26 Sep 2011 22:57:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115006#comment-13115006
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Jonathan Gray commented on HBASE-4477:
--------------------------------------

I think this will take a few changes to the Coprocessor API if we want to only use RegionObserver
and WALObserver.

Andy, what should one do if additional arguments are needed to, say, the prePut() call?  Do
we add multiple prePut() calls to the RegionObserver interface?  Potentially deprecate the
old ones?

If things are built only on Coprocessor interfaces, do people see us including these in some
kind of coprocessor contrib or should they be out on github or something?
                
> 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: 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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