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Posted to yarn-dev@hadoop.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2013/04/29 22:28:15 UTC

[jira] [Created] (YARN-624) Support gang scheduling in the AM RM protocol

Sandy Ryza created YARN-624:
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             Summary: Support gang scheduling in the AM RM protocol
                 Key: YARN-624
                 URL: https://issues.apache.org/jira/browse/YARN-624
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: api, scheduler
    Affects Versions: 2.0.4-alpha
            Reporter: Sandy Ryza
            Assignee: Sandy Ryza


Per discussion on YARN-392 and elsewhere, gang scheduling, in which a scheduler runs a set of tasks when they can all be run at the same time, would be a useful feature for YARN schedulers to support.

Currently, AMs can approximate this by holding on to containers until they get all the ones they need.  However, this lends itself to deadlocks when different AMs are waiting on the same containers.

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