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https://issues.apache.org/jira/browse/HADOOP-10597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15620110#comment-15620110
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Ming Ma commented on HADOOP-10597:
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[~zhz] that sounds good. Thank you.
> RPC Server signals backoff to clients when all request queues are full
> ----------------------------------------------------------------------
>
> Key: HADOOP-10597
> URL: https://issues.apache.org/jira/browse/HADOOP-10597
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Ming Ma
> Assignee: Ming Ma
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HADOOP-10597-2.patch, HADOOP-10597-3.patch,
> HADOOP-10597-4.patch, HADOOP-10597-5.patch, HADOOP-10597-6.patch,
> HADOOP-10597-branch-2.7.patch, HADOOP-10597.patch,
> MoreRPCClientBackoffEvaluation.pdf, RPCClientBackoffDesignAndEvaluation.pdf
>
>
> Currently if an application hits NN too hard, RPC requests be in blocking
> state, assuming OS connection doesn't run out. Alternatively RPC or NN can
> throw some well defined exception back to the client based on certain
> policies when it is under heavy load; client will understand such exception
> and do exponential back off, as another implementation of
> RetryInvocationHandler.
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