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https://issues.apache.org/jira/browse/HADOOP-11226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14287167#comment-14287167
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Gopal V commented on HADOOP-11226:
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I was following the line which had TCP keepalive set as a hard-parameter.
That was a sane default and on without options. Similarly, I didn't imagine any
case where people want slow IPC with dropped packets.
> 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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