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https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571667#comment-13571667
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Enis Soztutar commented on HBASE-3787:
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bq. The whole point here coming is how to query, from client, the result of an 
old operation happened in server.
That is why I advocate above whether we should make nonces visible to the 
client, and enable accepting client-defined nonces.
                
> 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: 0.96.0, 0.94.4
>            Reporter: dhruba borthakur
>            Priority: Critical
>             Fix For: 0.96.0
>
>
> 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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