Daryn Sharp created HDFS-10326:
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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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