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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3898) QJM: enable TCP_NODELAY for IPC
Date Fri, 07 Sep 2012 03:22:07 GMT
Todd Lipcon created HDFS-3898:
---------------------------------

             Summary: QJM: enable TCP_NODELAY for IPC
                 Key: HDFS-3898
                 URL: https://issues.apache.org/jira/browse/HDFS-3898
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: QuorumJournalManager (HDFS-3077)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Blocker


Currently, if the size of the edits batches is larger than the MTU, it can result in 40ms
delays due to interaction between nagle's algorithm and delayed ack. Enabling TCP_NODELAY
on the sockets solves this issue, so we should set those configs by default for all of the
QJM-related IPC.

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