Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/19385#discussion_r144671613 --- Diff: resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala --- @@ -174,6 +182,9 @@ private[spark] class MesosCoarseGrainedSchedulerBackend( override def start() { super.start() + if (sc.deployMode == "client") { + launcherBackend.connect --- End diff -- add `()` since this is not a property getter.
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