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Posted to yarn-issues@hadoop.apache.org by "Carlo Curino (JIRA)" <ji...@apache.org> on 2014/08/30 01:25:53 UTC

[jira] [Commented] (YARN-2475) ReservationSystem: replan upon capacity reduction

    [ https://issues.apache.org/jira/browse/YARN-2475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14116037#comment-14116037 ] 

Carlo Curino commented on YARN-2475:
------------------------------------

The first version of this is a simple greedy policy, that walk the plan, and for every instant in time that violate the new capacity, it removes reservation in reverse acceptance order (i.e., the reservation accepted last is the first to be rejected, thus protected older reservations).

> ReservationSystem: replan upon capacity reduction
> -------------------------------------------------
>
>                 Key: YARN-2475
>                 URL: https://issues.apache.org/jira/browse/YARN-2475
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>
> In the context of YARN-1051, if capacity of the cluster drops significantly upon machine failures we need to trigger a reorganization of the planned reservations. As reservations are "absolute" it is possible that they will not all fit, and some need to be rejected a-posteriori.  



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