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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10326) Disable setting tcp socket send/receive buffers for write pipelines
Date Mon, 25 Apr 2016 17:39:12 GMT
Daryn Sharp created HDFS-10326:
----------------------------------

             Summary: 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: hdfs, datanode
    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 settings the buffers, or the
the setReceiveBuffer and setSendBuffer should be removed entirely.



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