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From "Szehon Ho (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-8042) Optionally allow move tasks to run in parallel
Date Thu, 18 Dec 2014 01:04:38 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Szehon Ho updated HIVE-8042:
----------------------------
    Labels:   (was: TODOC14)

Minor wiki update to flag's description at [hive.exec.parallel|https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.parallel]
to explain new usages.

> Optionally allow move tasks to run in parallel
> ----------------------------------------------
>
>                 Key: HIVE-8042
>                 URL: https://issues.apache.org/jira/browse/HIVE-8042
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Gunther Hagleitner
>            Assignee: Gunther Hagleitner
>             Fix For: 0.14.0
>
>         Attachments: HIVE-8042.1.patch, HIVE-8042.2.patch, HIVE-8042.3.patch
>
>
> hive.exec.parallel allows one to run different stages of a query in parallel. However
that applies only to map-reduce tasks. When using large multi insert queries there are many
MoveTasks that are all executed in sequence on the client. There's no real reason for that
- they could be run in parallel as well (i.e.: the stage graph captures the dependencies and
knows which tasks can happen in parallel).



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