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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1641) add map joined table to distributed cache
Date Wed, 15 Sep 2010 22:01:37 GMT
add map joined table to distributed cache
-----------------------------------------

                 Key: HIVE-1641
                 URL: https://issues.apache.org/jira/browse/HIVE-1641
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Namit Jain
             Fix For: 0.7.0


Currently, the mappers directly read the map-joined table from HDFS, which makes it difficult
to scale.
We end up getting lots of timeouts once the number of mappers are beyond a few thousand, due
to 
concurrent mappers.

It would be good idea to put the mapped file into distributed cache and read from there instead.

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