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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4210) Allow coprocessor to interact with batches per region sent from a client(?)
Date Wed, 16 Jan 2013 22:08:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13555514#comment-13555514
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Lars Hofhansl commented on HBASE-4210:
--------------------------------------

Using RPC ID to tie individual hooks together works.

I also do like Anoops suggestion to pass an array of operations along with first and last.
Specifically that would be batchOp.operations, firstIndex, and lastIndexExclusive. That way
nothing needs to be copied and we still have the (semi) intuitive pattern that you get an
array of operations along with what subset of is being handled now.

The RPC ID idea is cleaner; but it is harder to use by a hook and the preHooks are actually
all run before any batch.
                
> Allow coprocessor to interact with batches per region sent from a client(?)
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-4210
>                 URL: https://issues.apache.org/jira/browse/HBASE-4210
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.94.0
>            Reporter: Lars Hofhansl
>            Assignee: Anoop Sam John
>            Priority: Minor
>             Fix For: 0.96.0, 0.94.5
>
>
> Currently the coprocessor write hooks - {pre|post}{Put|Delete} - are strictly one row|cell
operations.
> It might be a good idea to allow a coprocessor to deal with batches of puts and deletes
as they arrive from the client.

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