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https://issues.apache.org/jira/browse/HBASE-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276379#comment-13276379
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Andrew Purtell commented on HBASE-4720:
---------------------------------------
Patch v7 still applies to trunk, but with some fuzz. Implementation looks fine,
appropriate use of query parameters and HTTP return codes, thanks for
implementing it this way Mubarak. The only thing that looks missing is a check
for the not-modified case in TestRowResource and TestDelete.
> 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: 0.94.1
>
> Attachments: HBASE-4720.trunk.v1.patch, HBASE-4720.trunk.v2.patch,
> HBASE-4720.trunk.v3.patch, HBASE-4720.trunk.v4.patch,
> HBASE-4720.trunk.v5.patch, HBASE-4720.trunk.v6.patch,
> HBASE-4720.trunk.v7.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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