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From "bc Wong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-941) Datanode xceiver protocol should allow reuse of a connection
Date Fri, 08 Apr 2011 21:48:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

bc Wong updated HDFS-941:
-------------------------

    Attachment: HDFS-941-6.patch

Thanks for the feedback, Stack. The v6 patch:
* Undid the whitespace changes. My IDE was misconfigured.
* Turned hardcoded values into config keys.
* Fixed javadoc on BlockReader.
* Renamed {{gotEOS}} to {{eos}}.
* Handled null remoteAddr by closing the socket.

Did not work on:
* DN javadoc. I don't think I touched it.
* SocketCache copyright. It's there, I think.

I don't follow this (not sure what you're referring to):
bq. Why would we retry a socket that is throwing an IOE?

> 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: 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.patch, 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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