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https://issues.apache.org/jira/browse/HDFS-10326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16119134#comment-16119134
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Haohui Mai commented on HDFS-10326:
-----------------------------------

Committed to from trunk to branch-2.8.2. Thanks [~daryn] for the contribution.

> 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
>             Fix For: 2.8.2
>
>         Attachments: HDFS-10326.000.patch, HDFS-10326.001.patch, 
> HDFS-10326.001.patch
>
>
> 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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