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

    https://github.com/apache/spark/pull/14275#discussion_r71869084
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackendUtil.scala
 ---
    @@ -131,9 +140,18 @@ private[mesos] object MesosSchedulerBackendUtil 
extends Logging {
         val portmaps = conf
           .getOption("spark.mesos.executor.docker.portmaps")
           .map(parsePortMappingsSpec)
    +
    +    val containerizer = conf.get("spark.mesos.containerizer", "docker")
    +    if (!List("docker", "mesos").contains(containerizer)) {
    --- End diff --
    
    This might become obsolete then, not sure. But consider using `require` in 
any event


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