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

    https://github.com/apache/spark/pull/14275#discussion_r72003350
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackendUtil.scala
 ---
    @@ -105,16 +105,27 @@ private[mesos] object MesosSchedulerBackendUtil 
extends Logging {
       def addDockerInfo(
           container: ContainerInfo.Builder,
           image: String,
    +      containerizer: String,
           volumes: Option[List[Volume]] = None,
    -      network: Option[ContainerInfo.DockerInfo.Network] = None,
           portmaps: Option[List[ContainerInfo.DockerInfo.PortMapping]] = 
None): Unit = {
     
    -    val docker = ContainerInfo.DockerInfo.newBuilder().setImage(image)
    +    containerizer match {
    --- End diff --
    
    Can we have a sensible message/exception when we pass in a unknown 
containerizer? 


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