[jira] [Created] (HIVE-13926) How to limit reduce memory only not Map and Reduce all in Tez engine

["Feng Yuan (JIRA)" <ji...@apache.org>]

Feng Yuan created HIVE-13926:
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             Summary: How to limit reduce memory only not Map and Reduce all in Tez engine
                 Key: HIVE-13926
                 URL: https://issues.apache.org/jira/browse/HIVE-13926
             Project: Hive
          Issue Type: New Feature
          Components: Query Planning
    Affects Versions: 2.0.0
            Reporter: Feng Yuan
             Fix For: tez-branch


Now there is only a property:hive.tez.container.size.
This will modify map and reduce`s memory all.
If i want turn up reduce`s memory only.How could i do?
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And i think if there is a possiblilty for dynamiclly allocate reduce`s memory 
depend on reduce`s input size!
detils:
assume a reduce is allocated 2GB before.And in this condition a reduce`s normal input size is 1GB ，and when reduce`s input is 2GB, if hive can turn up mem to 4GB auto?



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