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

    https://github.com/apache/spark/pull/10057#discussion_r46252205
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterPersistenceEngine.scala
 ---
    @@ -94,7 +94,7 @@ private[spark] class 
ZookeeperMesosClusterPersistenceEngine(
         conf: SparkConf)
       extends MesosClusterPersistenceEngine with Logging {
       private val WORKING_DIR =
    -    conf.get("spark.deploy.zookeeper.dir", "/spark_mesos_dispatcher") + 
"/" + baseDir
    +    conf.get("spark.mesos.deploy.zookeeper.dir", 
"/spark_mesos_dispatcher") + "/" + baseDir
    --- End diff --
    
    Up to you, but does it make sense to fall back to the original property as 
a default to preserve compatibility? Does that make sense for all these 
Mesos-specific override properties?


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