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Posted to dev@hive.apache.org by "Gunther Hagleitner (JIRA)" <ji...@apache.org> on 2014/11/09 01:25:34 UTC
[jira] [Updated] (HIVE-8042) Optionally allow move tasks to run in
parallel
[ https://issues.apache.org/jira/browse/HIVE-8042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gunther Hagleitner updated HIVE-8042:
-------------------------------------
Issue Type: Improvement (was: Bug)
> 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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