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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-6613) Control when spcific Inputs / Outputs are started
Date Mon, 17 Mar 2014 22:50:44 GMT

     [ https://issues.apache.org/jira/browse/HIVE-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Siddharth Seth updated HIVE-6613:
---------------------------------

    Attachment: HIVE-6613.3.patch

Updated patch to include the missing file - and renamed to .patch for the pre-commit build.

> 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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