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Posted to dev@hive.apache.org by "Siddharth Seth (JIRA)" <ji...@apache.org> on 2014/03/11 03:23:42 UTC

[jira] [Created] (HIVE-6613) Control when spcific Inputs / Outputs are started

Siddharth Seth created HIVE-6613:
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             Summary: Control when spcific Inputs / Outputs are started
                 Key: HIVE-6613
                 URL: https://issues.apache.org/jira/browse/HIVE-6613
             Project: Hive
          Issue Type: Improvement
            Reporter: Siddharth Seth
            Assignee: Siddharth Seth


When running with Tez - a couple of enhancement are possible
1) Avoid re-fetching data in case of MapJoins - since the data is likely to be cached after the first run (container re-use for the same query)

2) Start Outputs only after required Inputs are ready - specifically useful in case of Reduce - where shuffle requires a large memory, and the Output (if it's a sorted output) also requires a fair amount of memory.



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