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Date: Fri, 5 May 2006 18:49:28 +0000 (GMT+00:00)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-195) transfer map output transfer with
 http instead of rpc
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    [ http://issues.apache.org/jira/browse/HADOOP-195?page=comments#action_12378100 ] 

Doug Cutting commented on HADOOP-195:
-------------------------------------

In that case then, perhaps increasing the the number of serving threads to N*2*tasks_per_node, and using parallel calls to N hosts (where N = 5 to start?) will help throughput, as you suggest.

> 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

>
> 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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