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https://issues.apache.org/jira/browse/HADOOP-9717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704336#comment-13704336
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Steve Loughran commented on HADOOP-9717:
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a byte is fairly compact and would let you track some multi-retry problems if
you are packet sampling; client just needs to stop incrementing once it is at
0xff.
> 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
> Reporter: Suresh Srinivas
>
> 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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