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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4610) Reservations continue looking for one app causes other apps to starve
Date Thu, 05 Jan 2017 22:50:59 GMT

     [ https://issues.apache.org/jira/browse/YARN-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated YARN-4610:
-----------------------------
    Fix Version/s: 2.8.0

> Reservations continue looking for one app causes other apps to starve
> ---------------------------------------------------------------------
>
>                 Key: YARN-4610
>                 URL: https://issues.apache.org/jira/browse/YARN-4610
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.7.1
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>             Fix For: 2.8.0, 2.7.3, 3.0.0-alpha1
>
>         Attachments: YARN-4610-branch-2.7.002.patch, YARN-4610.001.patch, YARN-4610.branch-2.7.001.patch
>
>
> CapacityScheduler's LeafQueue has "reservations continue looking" logic that allows an
application to unreserve elsewhere to fulfil a container request on a node that has available
space.  However in 2.7 that logic seems to break allocations for subsequent apps in the queue.
 Once a user hits its user limit, subsequent apps in the queue for other users receive containers
at a significantly reduced rate.



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