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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6713) The RPC server Listener thread is a scalability bottleneck
Date Tue, 06 Jul 2010 17:11:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885605#action_12885605
] 

Suresh Srinivas commented on HADOOP-6713:
-----------------------------------------

+1 for the patch.

> The RPC server Listener thread is a scalability bottleneck
> ----------------------------------------------------------
>
>                 Key: HADOOP-6713
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6713
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 0.21.0
>            Reporter: dhruba borthakur
>            Assignee: Dmytro Molkov
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-6713-rel20.2.patch, HADOOP-6713-rel20.3.patch, HADOOP-6713-rel20.patch,
HADOOP-6713.2.patch, HADOOP-6713.patch
>
>
> The Hadoop RPC Server implementation has a single Listener thread that reads data from
the socket and puts them into a call queue. This means that this single thread can pull RPC
requests off the network only as fast as a single CPU can execute. This is a scalability bottlneck
in our cluster.

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