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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8458) Support for batch version of checkAndPut() and checkAndDelete()
Date Mon, 30 Dec 2013 08:50:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13858666#comment-13858666
] 

Nicolas Liochon commented on HBASE-8458:
----------------------------------------

To me, the fact that multi is not available for checkAndXX (or increment) is more or less
a bug in the client api.
In 0.96+, the code for multiget and multiput is the same on the client side (iirc multiexist
is a subcase on get on 0.96). I did look at the other multis when I worked on the client in
the 0.96, but doing a proper work would have cost more than a week of work, so I excluded
it...

> Support for batch version of checkAndPut() and checkAndDelete()
> ---------------------------------------------------------------
>
>                 Key: HBASE-8458
>                 URL: https://issues.apache.org/jira/browse/HBASE-8458
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, regionserver
>    Affects Versions: 0.95.0
>            Reporter: Hari Mankude
>
> The use case is that the user has multiple threads loading hundreds of keys into a hbase
table. Occasionally there are collisions in the keys being uploaded by different threads.
So for correctness, it is required to do checkAndPut() instead of a put(). However, doing
a checkAndPut() rpc for every key update is non optimal. It would be good to have a batch
version of checkAndPut() similar to batch put(). The client can partition the keys on region
boundaries.
> The jira is NOT looking for any type of cross-row locking or multi-row atomicity with
checkAndPut()
> Batch version of checkAndDelete() is a similar requirement.



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