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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-490) set mapred.reduce.tasks to -1 in hive-default.xml
Date Sun, 17 May 2009 05:41:46 GMT
set mapred.reduce.tasks to -1 in hive-default.xml

                 Key: HIVE-490
                 URL: https://issues.apache.org/jira/browse/HIVE-490
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Clients
            Reporter: Joydeep Sen Sarma

this is profoundly irritating. we can estimate reducers. but since hadoop-default.xml sets
this to '1' - by default we don't. if we expect most users to set this to -1 - then we might
as well set it to -1 ourselves.

to not shoot ourselves in the foot - we might want to cap number of reducers based on cluster
size (like 2*Nodes).

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