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https://issues.apache.org/jira/browse/HIVE-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938521#comment-13938521
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Siddharth Seth commented on HIVE-6613:
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Review board - https://reviews.apache.org/r/19327/
> 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
> Attachments: HIVE-6613.2.txt, HIVE-6613.3.patch, TEZ-6613.1.txt
>
>
> 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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