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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-424) Allow resource requests to provide hints to the scheduler
Date Mon, 25 Feb 2013 09:18:13 GMT
Sandy Ryza created YARN-424:
-------------------------------

             Summary: 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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