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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10326) Disable setting tcp socket send/receive buffers for write pipelines
Date Tue, 26 Apr 2016 19:41:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15258771#comment-15258771

Ming Ma commented on HDFS-10326:

I tend to agree it should be fine to change the default to enable TCP auto tuning. But would
like to hear more from [~He Tianyi] about the scenario mentioned first. In addition, is changing
the default considered back incompatible?

> Disable setting tcp socket send/receive buffers for write pipelines
> -------------------------------------------------------------------
>                 Key: HDFS-10326
>                 URL: https://issues.apache.org/jira/browse/HDFS-10326
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, hdfs
>    Affects Versions: 2.6.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
> The DataStreamer and the Datanode use a hardcoded DEFAULT_DATA_SOCKET_SIZE=128K for the
send and receive buffers of a write pipeline.  Explicitly setting tcp buffer sizes disables
tcp stack auto-tuning.  
> The hardcoded value will saturate a 1Gb with 1ms RTT.  105Mbs at 10ms.  Paltry 11Mbs
over a 100ms long haul.  10Gb networks are underutilized.
> There should either be a configuration to completely disable setting the buffers, or
the the setReceiveBuffer and setSendBuffer should be removed entirely.

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