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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:
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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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