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Mingliang Liu commented on HDFS-10326: -------------------------------------- Thank you [~arpitagarwal] for your comment. I totally agree that we can simply make the {{DEFAULT_DATA_SOCKET_SIZE}} to 0 in order to enable TCP window auto-tuning by default. I attached a simple patch for illustrating this idea. > 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 > Attachments: HDFS-10326.000.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 (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org