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From "Babar Tareen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8458) Support for batch version of checkAndPut() and checkAndDelete()
Date Thu, 05 May 2016 00:10:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271683#comment-15271683
] 

Babar Tareen commented on HBASE-8458:
-------------------------------------

I implemented compare and set functionality for apache phoenix based on the exclusive locking
and coprocessors (https://github.com/babartareen/phoenix/blob/master/phoenix-core/src/main/java/org/apache/phoenix/hbase/index/Indexer.java#L295).
With recent change to using ReadWriteLock, a coprocessor will no longer have exclusive control
over a row and thus won't be the correct place to intercept a row update. CheckAndPut  can
not be called from the coprocessor as locks are already acquired as @Esther noted. Where might
be a better place to intercept an update and be able to allow/skip 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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