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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4049) hflush performance regression due to nagling delays
Date Tue, 16 Oct 2012 00:57:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-4049:
------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.3-alpha
                   3.0.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Committed to branch-2 and trunk.
                
> hflush performance regression due to nagling delays
> ---------------------------------------------------
>
>                 Key: HDFS-4049
>                 URL: https://issues.apache.org/jira/browse/HDFS-4049
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, performance
>    Affects Versions: 3.0.0, 2.0.2-alpha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 3.0.0, 2.0.3-alpha
>
>         Attachments: hdfs-4049.txt, hdfs-4049.txt, hdfs-4049.txt
>
>
> HDFS-3721 reworked the way that packets are mirrored through the pipeline in the datanode.
This caused two write() calls where there used to be one, which interacts badly with nagling
so that there are 40ms bubbles on hflush() calls. We didn't notice this in the tests because
the hflush perf test only uses a single datanode.

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