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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8458) Support for batch version of checkAndPut() and checkAndDelete()
Date Fri, 14 Apr 2017 21:46:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15969567#comment-15969567
] 

Nick Dimiduk commented on HBASE-8458:
-------------------------------------

I have a strong interest in this functionality as well.

{quote}
Alright... It should not be that hard to add (and in a backward compatible):
* Introduce a CheckAndRowMutation class that implements Row.
* Add handling to the multi at the region sever. Can just handle it like multi get at the
RS, and just call HRegion.get(...) in a loop. Later we can optimize this similar to miniBatchMutation.
* Use existing batch method on HTable.
{quote}

Any issues with this proposed design? Seems right to me.

> 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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