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https://issues.apache.org/jira/browse/HBASE-3787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566821#comment-13566821
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Andrew Purtell commented on HBASE-3787:
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I think this has come up again on the user list. See
http://search-hadoop.com/m/3naHBtQZV51/. Since we can easily change the on wire
RPC format of various operations for 0.96, now is a good time to look at this.
A solution might be to introduce a nonce (generated internally by the client)
on non-idempotent operations to convert them into idempotent ones. Not sure
exactly how that would work server side.
> 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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