Github user MaxGekk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21589#discussion_r197725870
--- Diff:
resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosFineGrainedSchedulerBackend.scala
---
@@ -446,6 +446,8 @@ private[spark] class MesosFineGrainedSchedulerBackend(
// TODO: query Mesos for number of cores
override def defaultParallelism(): Int =
sc.conf.getInt("spark.default.parallelism", 8)
+ override def numCores(): Int = defaultParallelism
+ override def numExecutors(): Int = 1
--- End diff --
I added comments to the ticket above.
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