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https://issues.apache.org/jira/browse/HADOOP-11226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342523#comment-14342523
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Gopal V commented on HADOOP-11226:
----------------------------------
Sure, I will add - I grepped to see where tcp.nodelay is mentioned, didn't see
any docs.
> 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,
> HADOOP-11226.3.patch, HADOOP-11226.4.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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