Github user felixcheung commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22001#discussion_r207745108
  
    --- Diff: 
resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosFineGrainedSchedulerBackend.scala
 ---
    @@ -453,4 +453,8 @@ private[spark] class MesosFineGrainedSchedulerBackend(
           super.applicationId
         }
     
    +  override def getNumSlots(): Int = {
    +    // TODO support this method for MesosFineGrainedSchedulerBackend
    --- End diff --
    
    so this breaks barrier execution on mesos completely? (since available slot 
is 0 it will just fail)


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