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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-3920) FairScheduler: Limit node reservations to large containers
Date Sat, 19 Sep 2015 19:55:04 GMT

     [ https://issues.apache.org/jira/browse/YARN-3920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Karthik Kambatla updated YARN-3920:
    Summary: FairScheduler: Limit node reservations to large containers  (was: FairScheduler
container reservation on a node should be configurable to limit it to large containers)

> FairScheduler: Limit node reservations to large containers
> ----------------------------------------------------------
>                 Key: YARN-3920
>                 URL: https://issues.apache.org/jira/browse/YARN-3920
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-3920.004.patch, YARN-3920.004.patch, YARN-3920.004.patch, YARN-3920.004.patch,
YARN-3920.005.patch, yARN-3920.001.patch, yARN-3920.002.patch, yARN-3920.003.patch
> Reserving a node for a container was designed for preventing large containers from starvation
from small requests that keep getting into a node. Today we let this be used even for a small
container request. This has a huge impact on scheduling since we block other scheduling requests
until that reservation is fulfilled. We should make this configurable so its impact can be
minimized by limiting it for large container requests as originally intended. 

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