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From Srigurunath Chakravarthi <srig...@yahoo-inc.com>
Subject Re: Question regarding Shuffle
Date Thu, 01 Jul 2010 16:05:55 GMT
Ahmad,
 Yes, http is used. Reducer tasks fetch map output via http from TaskTrackers.

Sriguru 

----- Original Message -----
From: Ahmad Shahzad <ashahzad4@gmail.com>
To: common-user@hadoop.apache.org <common-user@hadoop.apache.org>
Cc: Ahmad Shahzad <ashahzad4@gmail.com>
Sent: Thu Jul 01 07:54:51 2010
Subject: Question regarding Shuffle

Hi ALL,
           Does anyone know HOW Mappers pass their output to Reducers? Is
HTTP used for that or there is some other communication protocol used for
transferring the output of Mappers to Reducers.

Regards,
Ahmad Shahzad
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