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

    https://github.com/apache/spark/pull/14644#discussion_r78348094
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala
 ---
    @@ -103,6 +103,7 @@ private[spark] class MesosCoarseGrainedSchedulerBackend(
       private val stateLock = new ReentrantLock
     
       val extraCoresPerExecutor = conf.getInt("spark.mesos.extra.cores", 0)
    +  val maxGpus = conf.getInt("spark.mesos.gpus.max", 0)
    --- End diff --
    
    I see, in this case it's the same semantics as cpus.max, so I think using a 
really big number seems right to me. 


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