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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6808) Allow Schedulers to return OPPORTUNISTIC containers when queues go over configured capacity
Date Thu, 13 Jul 2017 05:01:08 GMT

    [ https://issues.apache.org/jira/browse/YARN-6808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085184#comment-16085184
] 

Arun Suresh commented on YARN-6808:
-----------------------------------

[~haibochen], the plan to use it to provide stricter capacity guarantees to queue, essentially
push preemption to the NM. I guess YARN-1015 / YARN-1013 can be viewed as something complementary.
My understanding is that in the later case, the scheduler would allocate OPP containers to
a specific node based on unused allocated resources. While, with this patch, OPP containers
will be allocated if an app requests resources beyond its available headroom.

> Allow Schedulers to return OPPORTUNISTIC containers when queues go over configured capacity
> -------------------------------------------------------------------------------------------
>
>                 Key: YARN-6808
>                 URL: https://issues.apache.org/jira/browse/YARN-6808
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>         Attachments: YARN-6808.001.patch
>
>
> This is based on discussions with [~kasha] and [~kkaranasos].
> Currently, when a Queues goes over capacity, apps on starved queues must wait either
for containers to complete or for them to be pre-empted by the scheduler to get resources.
> This JIRA proposes to allow Schedulers to:
> # Allocate all containers over the configured queue capacity/weight as OPPORTUNISTIC.
> # Auto-promote running OPPORTUNISTIC containers of apps as and when their GUARANTEED
containers complete.



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