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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14403) LLAP node specific preemption will only preempt once on a node per AM
Date Tue, 02 Aug 2016 21:05:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Siddharth Seth updated HIVE-14403:
----------------------------------
    Attachment: HIVE-14403.01.patch

Patch to fix this, along with additional log messages and unit tests.

The core change in the patch is the following... 
{code}
-        val = new MutableInt(1);
+        val = new MutableInt(0);
{code}


[~hagleitn], [~prasanth_j] - please review.

> 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
>
>
> 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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