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From "Andrew Purtell (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4477) Ability for an application to store metadata into the transaction log
Date Wed, 28 Sep 2011 18:37:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116675#comment-13116675
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Andrew Purtell commented on HBASE-4477:
---------------------------------------

@dhruba

bq. can I change the signature of RegionObserver.prePut() to take in two additional arguments:
a WALEdit and Put object

That sounds good. Since there is no release yet, no deprecation is necessary. Can be done
simply by a patch on this issue I'd say.

@Jon

bq. 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

I think it depends. Some stuff like security we'd clearly want to bundle. And by that not
a resurrection of contrib, instead as another package in main/.  Random additions that people
build for themselves should go up on GitHub. My opinion is anything that is core to a group
of use cases is a candidate for bundling, if a contributor or committer wants to maintain
it, and/or if people generally feel it is a good idea to bring the candidate in.
                
> 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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