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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1338) Improve the shuffle phase by using the "connection: keep-alive" and doing batch transfers of files
Date Tue, 08 May 2007 06:18:15 GMT
Improve the shuffle phase by using the "connection: keep-alive" and doing batch transfers of
files
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                 Key: HADOOP-1338
                 URL: https://issues.apache.org/jira/browse/HADOOP-1338
             Project: Hadoop
          Issue Type: Improvement
          Components: mapred
            Reporter: Devaraj Das
             Fix For: 0.14.0


We should do transfers of map outputs at the granularity of  *total-bytes-transferred* rather
than the current way of transferring a single file and then closing the connection to the
server. A single TaskTracker might have a couple of map output files for a given reduce, and
we should transfer multiple of them (upto a certain total size) in a single connection to
the TaskTracker. Using HTTP-1.1's keep-alive connection would help since it would keep the
connection open for more than one file transfer. We should limit the transfers to a certain
size so that we don't hold up a jetty thread indefinitely (and cause timeouts for other clients).
Overall, this should give us improved performance.

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