hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6713) The RPC server Listener thread is a scalability bottleneck
Date Tue, 27 Apr 2010 17:40:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861466#action_12861466
] 

Hairong Kuang commented on HADOOP-6713:
---------------------------------------

+1

Note that this patch assigns read channels to readers in a round-robin fashion. Ideally it
would be nicer if all readers share a set of selected keys and ready-to-read channels are
dynamically assigned to each reader. This would enforce better balance among readers. But
I think we could have this improvement at a later time.

> 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
>         Attachments: 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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message