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https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13816297#comment-13816297
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Sergey Shelukhin commented on HBASE-3787:
-----------------------------------------

any takers for review? This is a huge pita to rebase when it becomes stale

> Increment is non-idempotent but client retries RPC
> --------------------------------------------------
>
>                 Key: HBASE-3787
>                 URL: https://issues.apache.org/jira/browse/HBASE-3787
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.94.4, 0.95.2
>            Reporter: dhruba borthakur
>            Assignee: Sergey Shelukhin
>            Priority: Blocker
>         Attachments: HBASE-3787-partial.patch, HBASE-3787-v0.patch, 
> HBASE-3787-v1.patch, HBASE-3787-v2.patch, HBASE-3787-v3.patch, 
> HBASE-3787-v4.patch, HBASE-3787-v5.patch, HBASE-3787-v5.patch, 
> HBASE-3787-v6.patch, HBASE-3787-v7.patch, HBASE-3787-v8.patch
>
>
> The HTable.increment() operation is non-idempotent. The client retries the 
> increment RPC a few times (as specified by configuration) before throwing an 
> error to the application. This makes it possible that the same increment call 
> be applied twice at the server.
> For increment operations, is it better to use 
> HConnectionManager.getRegionServerWithoutRetries()? Another  option would be 
> to enhance the IPC module to make the RPC server correctly identify if the 
> RPC is a retry attempt and handle accordingly.



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