Merge pull request apache#44 in BDP/apache-spark from fix_min_reg_res…

…ources_wait to netflix/2.1.1-unstable

* commit 'd68183c4087fb436a7e62d739804c1765f734184':
  Only check for minRegistered ratio if maxCoresOption is set

mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala

@@ -276,7 +276,7 @@ private[spark] class MesosCoarseGrainedSchedulerBackend(
   }
 
   override def sufficientResourcesRegistered(): Boolean = {
-    totalCoreCount.get >= maxCoresOption.getOrElse(0) * minRegisteredRatio
+    maxCoresOption.isEmpty || totalCoreCount.get >= maxCores * minRegisteredRatio
   }
 
   override def disconnected(d: org.apache.mesos.SchedulerDriver) {}