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https://issues.apache.org/jira/browse/HADOOP-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13717561#comment-13717561
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Daryn Sharp commented on HADOOP-8069:
-------------------------------------
Should we again consider changing the default for nodelay? On one of our
busiest cluster, listStatus represents about ~3% of RPC load. A few extra
packets here and there on a fast network are going to be delivered much faster
than the nagle delay.
> Enable TCP_NODELAY by default for IPC
> -------------------------------------
>
> Key: HADOOP-8069
> URL: https://issues.apache.org/jira/browse/HADOOP-8069
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-8069.txt
>
>
> I think we should switch the default for the IPC client and server NODELAY
> options to true. As wikipedia says:
> {quote}
> In general, since Nagle's algorithm is only a defense against careless
> applications, it will not benefit a carefully written application that takes
> proper care of buffering; the algorithm has either no effect, or negative
> effect on the application.
> {quote}
> Since our IPC layer is well contained and does its own buffering, we
> shouldn't be careless.
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