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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-3898) QJM: enable TCP_NODELAY for IPC
Date Mon, 10 Sep 2012 18:48:09 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon resolved HDFS-3898.

       Resolution: Fixed
    Fix Version/s: QuorumJournalManager (HDFS-3077)
     Hadoop Flags: Reviewed

Committed to branch, thanks for the reviews
> 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
>             Fix For: QuorumJournalManager (HDFS-3077)
>         Attachments: hdfs-3898.txt, hdfs-3898.txt
> 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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