[
https://issues.apache.org/jira/browse/HADOOP-7421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436238#comment-13436238
]
Daryn Sharp commented on HADOOP-7421:
-------------------------------------
Regarding concern to harming performance, I recently noticed that MR/Yarn job
submission is hardcoded to disable nagle in the conf.
> Performance Patch: Disable Client-Side Nagle By Default
> -------------------------------------------------------
>
> 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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
