Performance Patch: Disable Client-Side Nagle By Default
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Key: HADOOP-7421
URL: https://issues.apache.org/jira/browse/HADOOP-7421
Project: Hadoop Common
Issue Type: Improvement
Reporter: Ron Bodkin
HADOOP-2232 was a valuable contribution, but I would suggest that Hadoop IPC
should disable Nagle's algorithm by default, to improve performance
system-wide. Nagle just adds delay to network connections, which is unnecessary
in the high bandwidth networks that Hadoop uses. As it stands, this becomes an
obscure, little known but important performance optimization (especially for
HBase), which took us days to track down during a performance tuning exercise.
Obviously integrating this optimization into the Hadoop release will require
performance testing to validate that it doesn't harm performance, but it should
only help.
I will submit a patch for how to address this in trunk.
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