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


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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