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https://issues.apache.org/jira/browse/HADOOP-11226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333052#comment-14333052
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Gopal V commented on HADOOP-11226:
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Sure, I will update the patch in a couple of days with a config option.
To correct Colin, this patch was built for 10GigE (ixgbe drivers). I tested
this with both H-TCP and Cubic congestion control (2.6 and 3.1 kernels).
The RFCs listed in the patch apply only toTCP/IP not Infiniband RDMA (unless
JDK7+ translates the hints via SDP, which is something I'd love to be tested by
the community).
> 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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