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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-195) transfer map output transfer with http instead of rpc
Date Thu, 11 May 2006 07:32:07 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-195?page=all ]

Owen O'Malley updated HADOOP-195:

    Attachment: data-transfer-chart.pdf

Here is a chart of the data transfers from Monday's run (blue) and Tuesday's run (red). The
parallel fetches seem help most in the early part of the curve. You can also see the substantial
rework that was caused by losing the tasks on Monday.

> transfer map output transfer with http instead of rpc
> -----------------------------------------------------
>          Key: HADOOP-195
>          URL: http://issues.apache.org/jira/browse/HADOOP-195
>      Project: Hadoop
>         Type: Improvement

>   Components: mapred
>     Versions: 0.2
>     Reporter: Owen O'Malley
>     Assignee: Owen O'Malley
>      Fix For: 0.3
>  Attachments: data-transfer-chart.pdf, netstat.log, netstat.xls
> The data transfer of the map output should be transfered via http instead rpc, because
rpc is very slow for this application and the timeout behavior is suboptimal. (server sends
data and client ignores it because it took more than 10 seconds to be received.)

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