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From "ramkrishna.s.vasudevan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5617) Provide coprocessor hooks in put flow while rollbackMemstore.
Date Thu, 29 Mar 2012 05:19:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240982#comment-13240982
] 

ramkrishna.s.vasudevan commented on HBASE-5617:
-----------------------------------------------

@Andy
Yes, this patch adds some more hooks other than the one specified in the JIRA title.
My intention was to know if it is ok to add new hooks like the one in the patch.

If it is fine i can raise another JIRA for the same and leave this JIRA with only hooks for
rollbackOfMemStore.

                
> Provide coprocessor hooks in put flow while rollbackMemstore.
> -------------------------------------------------------------
>
>                 Key: HBASE-5617
>                 URL: https://issues.apache.org/jira/browse/HBASE-5617
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.96.0
>
>         Attachments: HBASE-5617_1.patch
>
>
> With coprocessors hooks while put happens we have the provision to create new puts to
other tables or regions.  These puts can be done with writeToWal as false.
> In 0.94 and above the puts are first written to memstore and then to WAL.  If any failure
in the WAL append or sync the memstore is rollbacked.  
> Now the problem is that if the put that happens in the main flow fails there is no way
to rollback the 
> puts that happened in the prePut.
> We can add coprocessor hooks to like pre/postRoolBackMemStore.  Is any one hook enough
here?

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