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https://issues.apache.org/jira/browse/SPARK-20483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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DB Tsai reassigned SPARK-20483:
-------------------------------
Assignee: Davis Shepherd
> Mesos Coarse mode may starve other Mesos frameworks if max cores is not a
> multiple of executor cores
> ----------------------------------------------------------------------------------------------------
>
> Key: SPARK-20483
> URL: https://issues.apache.org/jira/browse/SPARK-20483
> Project: Spark
> Issue Type: Bug
> Components: Mesos
> Affects Versions: 2.0.2, 2.1.0, 2.1.1
> Reporter: Davis Shepherd
> Assignee: Davis Shepherd
> Priority: Minor
>
> if {{spark.cores.max = 10}} for example and {{spark.executor.cores = 4}}, 2
> executors will get launched thus {{totalCoresAcquired = 8}}. All future Mesos
> offers will not get tasks launched because
> {{sc.conf.getInt("spark.executor.cores", ...) + totalCoresAcquired <=
> maxCores}} will always evaluate to false. However, in
> {{handleMatchedOffers}} we check if {{totalCoresAcquired >= maxCores}} to
> determine if we should decline the offer "for a configurable amount of time
> to avoid starving other frameworks", and this will always evaluate to false
> in the above scenario. This leaves the framework in a state of limbo where it
> will never launch any new executors, but only decline offers for the Mesos
> default of 5 seconds, thus starving other frameworks of offers.
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