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From "Subramaniam Krishnan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2475) ReservationSystem: replan upon capacity reduction
Date Fri, 12 Sep 2014 21:42:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-2475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14132158#comment-14132158
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Subramaniam Krishnan commented on YARN-2475:
--------------------------------------------

bq. Just a minor clarification: as this iterates over each instant of the plan, are others
allowed to modify it?

I prefer current approach to global locking of plan as users can submit requests for new (or
modify existing reservations) for future. Additional requests within the replanning window
will be rejected at the validation stage itself even before they reach the plan because execution
of replanner implies there is no spare capacity. Makes sense?

> 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
>         Attachments: YARN-2475.patch, YARN-2475.patch, YARN-2475.patch
>
>
> 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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