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Date: Thu, 12 Jan 2012 19:11:39 +0000 (UTC)
From: "Zhihong Yu (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-4720) Implement atomic update operations
 (checkAndPut, checkAndDelete) for REST client/server
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    [ https://issues.apache.org/jira/browse/HBASE-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185150#comment-13185150 ] 

Zhihong Yu commented on HBASE-4720:
-----------------------------------

@Andrew:
Can you take a look at patch v4, please ?
                
> Implement atomic update operations (checkAndPut, checkAndDelete) for REST client/server 
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-4720
>                 URL: https://issues.apache.org/jira/browse/HBASE-4720
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Daniel Lord
>            Assignee: Mubarak Seyed
>             Fix For: 0.94.0
>
>         Attachments: HBASE-4720.trunk.v1.patch, HBASE-4720.trunk.v2.patch, HBASE-4720.trunk.v3.patch, HBASE-4720.trunk.v4.patch, HBASE-4720.v1.patch, HBASE-4720.v3.patch
>
>
> I have several large application/HBase clusters where an application node will occasionally need to talk to HBase from a different cluster.  In order to help ensure some of my consistency guarantees I have a sentinel table that is updated atomically as users interact with the system.  This works quite well for the "regular" hbase client but the REST client does not implement the checkAndPut and checkAndDelete operations.  This exposes the application to some race conditions that have to be worked around.  It would be ideal if the same checkAndPut/checkAndDelete operations could be supported by the REST client.

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