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Posted to yarn-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2014/09/03 04:30:51 UTC

[jira] [Created] (YARN-2491) Speculative attempts should not run on the same node as their original attempt

Todd Lipcon created YARN-2491:
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             Summary: Speculative attempts should not run on the same node as their original attempt
                 Key: YARN-2491
                 URL: https://issues.apache.org/jira/browse/YARN-2491
             Project: Hadoop YARN
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 3.0.0
            Reporter: Todd Lipcon


I'm seeing a behavior on trunk with fair scheduler enabled where a speculative reduce attempt is getting run on the same node as its original attempt. This doesn't make sense -- the main reason for speculative execution is to deal with a slow node, so scheduling a second attempt on the same node would just make the problem worse if anything.



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