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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HADOOP-11226) ipc.Client has to use setTrafficClass() with IPTOS_LOWDELAY|IPTOS_RELIABILITY
Date Tue, 24 Feb 2015 02:04:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326935#comment-14326935
] 

Colin Patrick McCabe edited comment on HADOOP-11226 at 2/24/15 2:03 AM:
------------------------------------------------------------------------

I think a configuration boolean is fine.  It should default to the current behavior until
we've had a chance to analyze its performance on typical ethernet networks.  I would also
be fine with this defaulting to true only for infiniband, although I don't know if we have
a good way of doing that. (edit: as per Gopal's comments, this option might not make sense
on infiniband)


was (Author: cmccabe):
I think a configuration boolean is fine.  It should default to the current behavior until
we've had a chance to analyze its performance on typical ethernet networks.  I would also
be fine with this defaulting to true only for infiniband, although I don't know if we have
a good way of doing that.

> ipc.Client has to use setTrafficClass() with IPTOS_LOWDELAY|IPTOS_RELIABILITY
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-11226
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11226
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 2.6.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: Infiniband
>         Attachments: HADOOP-11226.1.patch, HADOOP-11226.2.patch
>
>
> During heavy shuffle, packet loss for IPC packets was observed from a machine.
> Avoid packet-loss and speed up transfer by using 0x14 QOS bits for the packets.



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