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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8042) Optionally allow move tasks to run in parallel
Date Fri, 12 Sep 2014 08:24:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14131261#comment-14131261
] 

Lefty Leverenz commented on HIVE-8042:
--------------------------------------

Should the description of *hive.exec.parallel* be revised in HiveConf.java, since its behavior
is changing in 0.14.0?  (Sorry I didn't chime in earlier.)

Alternatively, the wiki could provide information about this change:

* [hive.exec.parallel | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.parallel]

> Optionally allow move tasks to run in parallel
> ----------------------------------------------
>
>                 Key: HIVE-8042
>                 URL: https://issues.apache.org/jira/browse/HIVE-8042
>             Project: Hive
>          Issue Type: Bug
>            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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