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https://issues.apache.org/jira/browse/HADOOP-9717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13707743#comment-13707743
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Tsz Wo (Nicholas), SZE commented on HADOOP-9717:
------------------------------------------------

The retry number is also needed in the client side since client needs to find 
out the request corresponding to the response received.  (We currently use a 
hashtable to store the calls in the client side.)
                
> Add retry flag/retry attempt count to the RPC requests
> ------------------------------------------------------
>
>                 Key: HADOOP-9717
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9717
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Suresh Srinivas
>            Assignee: Tsz Wo (Nicholas), SZE
>
> RetryCache lookup on server side implementation can be optimized if Rpc 
> request indicates if the request is being retried. This jira proposes adding 
> an optional field to Rpc request that indicates if request is being retried.

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