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https://issues.apache.org/jira/browse/SPARK-19373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-19373.
-------------------------------
       Resolution: Fixed
         Assignee: Michael Gummelt
    Fix Version/s: 2.2.0

> Mesos implementation of spark.scheduler.minRegisteredResourcesRatio looks at 
> acquired cores rather than registerd cores
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-19373
>                 URL: https://issues.apache.org/jira/browse/SPARK-19373
>             Project: Spark
>          Issue Type: Bug
>          Components: Mesos
>    Affects Versions: 1.6.3, 2.0.2, 2.1.0
>            Reporter: Michael Gummelt
>            Assignee: Michael Gummelt
>             Fix For: 2.2.0
>
>
> We're currently using `totalCoresAcquired` to account for registered 
> resources, which is incorrect.  That variable measures the number of cores 
> the scheduler has accepted.  We should be using `totalCoreCount` like the 
> other schedulers do.
> Fixing this is important for locality, since users often want to wait for all 
> executors to come up before scheduling tasks to ensure they get a node-local 
> placement. 
> original PR to add support: https://github.com/apache/spark/pull/8672/files



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