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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 Thu, 29 Sep 2011 18:21:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117500#comment-13117500
] 

Andrew Purtell commented on HBASE-4477:
---------------------------------------

In my opinion prefixing anything regarding coprocessors with CP should be an anti-pattern.
                
> 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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