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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