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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-424) Allow resource requests to provide hints to the scheduler
Date Tue, 26 Feb 2013 00:48:14 GMT

    [ https://issues.apache.org/jira/browse/YARN-424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586535#comment-13586535
] 

Arun C Murthy commented on YARN-424:
------------------------------------

Also, the reason we have invested in using protobufs (or any sane serialization system) is
that we can *add* features to the Scheduler protocol in a compatible manner when we need to
- key/value pairs are evil, and completely unnecessary.

I've had enough with key/value pairs, and then attendant demands to maintain compatibility
for those key/value pairs forever.
                
> Allow resource requests to provide hints to the scheduler 
> ----------------------------------------------------------
>
>                 Key: YARN-424
>                 URL: https://issues.apache.org/jira/browse/YARN-424
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: api, applications, scheduler
>    Affects Versions: 2.0.3-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>
> As initially discussed on YARN-392, it would be helpful for the allocate protocol to
be able to include hints to the scheduler.  Examples hints could include deadlines (containers
needed by a certain time) or gangs (resources that should be scheduled at the same time or
not at all).
> To avoid placing complex scheduling expectations on the RM, the restrictions on hints
would be:
> * Any scheduler may ignore any subset of hints. That is, applications must be written
to handle resource requests as if their hints don't exist.
> * Must be bounded in length - perhaps no larger than 16 bytes or 100 characters.

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