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https://issues.apache.org/jira/browse/HADOOP-10125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13874115#comment-13874115
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Brandon Li commented on HADOOP-10125:
-------------------------------------
Sure. I've back ported it to branch-2.
> no need to process RPC request if the client connection has been dropped
> ------------------------------------------------------------------------
>
> Key: HADOOP-10125
> URL: https://issues.apache.org/jira/browse/HADOOP-10125
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 3.0.0
> Reporter: Ming Ma
> Assignee: Ming Ma
> Fix For: 3.0.0, 2.4.0
>
> Attachments: hadoop_10125_trunk.patch
>
>
> If the client has dropped the connection before the RPC is processed, RPC
> server doesn't need to process the RPC call. We have encountered issues where
> bad applications can bring down the NN.
> https://issues.apache.org/jira/i#browse/Hadoop-9640 tries to address that.
> When this occurs, NN's RPC queues are filled up with client requests and DN
> requests, sometimes we want to stop the flooding by stopping the bad
> applications and/or DNs. Some RPC processing like
> DatanodeProtocol::blockReport could take couple hundred milliseconds. So it
> is worthwhile to have NN skip the RPC calls if DNs have been stopped.
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