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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10597) RPC Server signals backoff to clients when all request queues are full
Date Sun, 30 Oct 2016 15:32:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15620110#comment-15620110
] 

Ming Ma commented on HADOOP-10597:
----------------------------------

[~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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