Davis Shepherd created SPARK-20483:
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Summary: 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: 2.1.0
Reporter: Davis Shepherd
Priority: Minor
if `spark.cores.max = 10` for example and `spark.executor.cores = 4`, 2
executors will get lauched 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.
Relates to: SPARK-12554
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