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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-941) Datanode xceiver protocol should allow reuse of a connection
Date Thu, 09 Jun 2011 18:53:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046739#comment-13046739
] 

Hadoop QA commented on HDFS-941:
--------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12481962/941.22.txt
  against trunk revision 1134031.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 21 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/754//console

This message is automatically generated.

> Datanode xceiver protocol should allow reuse of a connection
> ------------------------------------------------------------
>
>                 Key: HDFS-941
>                 URL: https://issues.apache.org/jira/browse/HDFS-941
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, hdfs client
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: bc Wong
>         Attachments: 941.22.txt, HDFS-941-1.patch, HDFS-941-2.patch, HDFS-941-3.patch,
HDFS-941-3.patch, HDFS-941-4.patch, HDFS-941-5.patch, HDFS-941-6.22.patch, HDFS-941-6.patch,
HDFS-941-6.patch, HDFS-941-6.patch, fix-close-delta.txt, hdfs-941.txt, hdfs-941.txt, hdfs-941.txt,
hdfs-941.txt, hdfs941-1.png
>
>
> Right now each connection into the datanode xceiver only processes one operation.
> In the case that an operation leaves the stream in a well-defined state (eg a client
reads to the end of a block successfully) the same connection could be reused for a second
operation. This should improve random read performance significantly.

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