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https://issues.apache.org/jira/browse/HBASE-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169969#comment-13169969
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stack commented on HBASE-4720:
------------------------------

Option 2 sounds better.  How do you pass the value to check in option 2?  You 
can't pass it as attribute because it could be binary, right?  Maybe in the 
body of the put, you have two values, first the one to check then the one to 
set if it pans out.  Ditto delete?
                
> 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
>
> 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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