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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HIVE-14403) LLAP node specific preemption will only preempt once on a node per AM
Date Tue, 02 Aug 2016 23:22:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405003#comment-15405003
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Siddharth Seth edited comment on HIVE-14403 at 8/2/16 11:21 PM:
----------------------------------------------------------------

Minor update to fix an import and re-introduce a break statement which was accidentally deleted
(exited out of a loop early, and functionally harmless to skip it)


was (Author: sseth):
Minor update to fix an import and re-introduce a break statement which was accidentally deleted
(exited out of a loop early, and harmless to not run it)

> LLAP node specific preemption will only preempt once on a node per AM
> ---------------------------------------------------------------------
>
>                 Key: HIVE-14403
>                 URL: https://issues.apache.org/jira/browse/HIVE-14403
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>            Priority: Critical
>         Attachments: HIVE-14403.01.patch, HIVE-14403.02.patch
>
>
> Query hang reported by [~cartershanklin]
> Turns out that once an AM has preempted a task on a node for locality, it will not be
able to preempt another task on the same node (specifically for local requests)
> Manifests as a query hanging. It's possible for a previous query to interfere with a
subsequent query since the AM is shared.



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