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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-941) Datanode xceiver protocol should allow reuse of a connection
Date Thu, 16 Jun 2011 03:19:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050197#comment-13050197
] 

stack commented on HDFS-941:
----------------------------

@Konstantin

Convention is that RM says whats in a release and no one else.  See his +1 above.

bq. ...proof of no-degradation to sequential ios.

What would this test look like?  Perf tests done above showed only minor differences ("...well
within the standard deviation." as per Todd).

And if this test can only be committed pending perf evaluation, why single this patch out
and not require it of all commits to hdfs?

> 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
>             Fix For: 0.22.0
>
>         Attachments: 941.22.txt, 941.22.txt, 941.22.v2.txt, 941.22.v3.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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