Mingliang Liu commented on HDFS-10326:

Thanks [~wheat9] for taking care of this.

> 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.

This message was sent by Atlassian JIRA

To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org

Reply via email to