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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10597) Evaluate if we can have RPC client back off when server is under heavy load
Date Fri, 04 Jul 2014 06:48:34 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ming Ma updated HADOOP-10597:
-----------------------------

    Attachment: HADOOP-10597-2.patch
                RPCClientBackoffDesignAndEvaluation.pdf

[~lohit] provided some feedback. Here is the design document with some evaluation results.
The updated patch also includes unit tests and make the server side retry policy pluggable.

> Evaluate if we can have RPC client back off when server is under heavy load
> ---------------------------------------------------------------------------
>
>                 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
>         Attachments: HADOOP-10597-2.patch, HADOOP-10597.patch, 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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