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From "GAO Rui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9494) Parallel optimization of DFSStripedOutputStream#flushAllInternals( )
Date Mon, 01 Feb 2016 00:56:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15125588#comment-15125588
] 

GAO Rui commented on HDFS-9494:
-------------------------------

Thank you all very much for your patient comments and kind help, [~jingzhao],[~szetszwo],[~rakeshr].

> Parallel optimization of DFSStripedOutputStream#flushAllInternals( )
> --------------------------------------------------------------------
>
>                 Key: HDFS-9494
>                 URL: https://issues.apache.org/jira/browse/HDFS-9494
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: GAO Rui
>            Assignee: GAO Rui
>            Priority: Minor
>             Fix For: 3.0.0
>
>         Attachments: HDFS-9494-origin-trunk.00.patch, HDFS-9494-origin-trunk.01.patch,
HDFS-9494-origin-trunk.02.patch, HDFS-9494-origin-trunk.03.patch, HDFS-9494-origin-trunk.04.patch,
HDFS-9494-origin-trunk.05.patch, HDFS-9494-origin-trunk.06.patch, HDFS-9494-origin-trunk.07.patch,
HDFS-9494-origin-trunk.08.patch
>
>
> Currently, in DFSStripedOutputStream#flushAllInternals( ), we trigger and 
> wait for flushInternal( ) in sequence. So the runtime flow is like:
> {code}
> Streamer0#flushInternal( )
> Streamer0#waitForAckedSeqno( )
> Streamer1#flushInternal( )
> Streamer1#waitForAckedSeqno( )
> …
> Streamer8#flushInternal( )
> Streamer8#waitForAckedSeqno( )
> {code}
> It could be better to trigger all the streamers to flushInternal( ) and
> wait for all of them to return from waitForAckedSeqno( ),  and then flushAllInternals(
) returns.



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