[jira] [Updated] (YARN-5139) [Umbrella] Move YARN scheduler towards global scheduler

["Wangda Tan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-5139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wangda Tan updated YARN-5139:
-----------------------------
    Attachment: wip-3.YARN-5139.patch

> [Umbrella] Move YARN scheduler towards global scheduler
> -------------------------------------------------------
>
>                 Key: YARN-5139
>                 URL: https://issues.apache.org/jira/browse/YARN-5139
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: wip-1.YARN-5139.patch, wip-2.YARN-5139.patch, wip-3.YARN-5139.patch
>
>
> Existing YARN scheduler is based on node heartbeat. This can lead to sub-optimal decisions because scheduler can only look at one node at the time when scheduling resources.
> Pseudo code of existing scheduling logic looks like:
> {code}
> for node in allNodes:
>    Go to parentQueue
>       Go to leafQueue
>         for application in leafQueue.applications:
>            for resource-request in application.resource-requests
>               try to schedule on node
> {code}
> Considering future complex resource placement requirements, such as node constraints (give me "a && b || c") or anti-affinity (do not allocate HBase regionsevers and Storm workers on the same host), we may need to consider moving YARN scheduler towards global scheduling.



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