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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-3655) Use ChainMapper and ChainReducer for queries having [Map+][RMap*] pattern
Date Fri, 02 Nov 2012 11:39:11 GMT
Amareshwari Sriramadasu created HIVE-3655:
---------------------------------------------

             Summary: Use ChainMapper and ChainReducer for queries having [Map+][RMap*] pattern
                 Key: HIVE-3655
                 URL: https://issues.apache.org/jira/browse/HIVE-3655
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Amareshwari Sriramadasu


While breaking the query plan into multiple map reduce tasks, Hive should consider the pattern
[Map+][ReduceMap*] and generate single map reduce job for such patterns using ChainMapper
and ChainReducer

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