DataXceiver client should use TCP_NODELAY
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Key: HDFS-1037
URL: https://issues.apache.org/jira/browse/HDFS-1037
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client
Affects Versions: 0.22.0
Reporter: Todd Lipcon
When the BlockReader connects to the DataXceiver and sends OP_READ_BLOCK, it
doesn't set TCP_NODELAY to true first. This means that the OS will wait some
number of ms to try to bundle further writes into the same TCP packet. Since we
are only writing a small amount, and we already use a buffer, we can safely
turn on NODELAY to avoid the nagling delay, potentially improving random read
performance.
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