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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6613) Control when spcific Inputs / Outputs are started
Date Wed, 19 Mar 2014 21:14:45 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941001#comment-13941001
] 

Gunther Hagleitner commented on HIVE-6613:
------------------------------------------

Ran tests locally. No errors.

> 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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