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

    https://github.com/apache/spark/pull/11157#discussion_r62743042
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerUtils.scala
 ---
    @@ -356,4 +374,229 @@ private[mesos] trait MesosSchedulerUtils extends 
Logging {
         
sc.conf.getTimeAsSeconds("spark.mesos.rejectOfferDurationForReachedMaxCores", 
"120s")
       }
     
    +  /**
    +   * Checks executor ports if they are within some range of the offered 
list of ports ranges,
    +   *
    +   * @param sc the Spark Context
    +   * @param ports the list of ports to check
    +   * @return true if ports are within range false otherwise
    +   */
    +  protected def checkPorts(sc: SparkContext, ports: List[(Long, Long)]): 
Boolean = {
    +
    +    def checkIfInRange(port: Int, ps: List[(Long, Long)]): Boolean = {
    +      ps.exists(r => r._1 <= port & r._2 >= port)
    +    }
    +
    +    val portsToCheck = List(sc.conf.getInt("spark.executor.port", 0),
    +      sc.conf.getInt("spark.blockManager.port", 0))
    +    val nonZeroPorts = portsToCheck.filter(_ != 0)
    +    val withinRange = nonZeroPorts.forall(p => checkIfInRange(p, ports))
    +    // make sure we have enough ports to allocate per offer
    +    ports.map(r => r._2 - r._1 + 1).sum >= portsToCheck.size && withinRange
    +  }
    +
    +  /**
    +   * Partitions port resources.
    +   *
    +   * @param conf the spark config
    +   * @param ports the ports offered
    +   * @return resources left, port resources to be used and the list of 
assigned ports
    +   */
    +  def partitionPorts(
    +      conf: SparkConf,
    +      ports: List[Resource])
    +    : (List[Resource], List[Resource], List[Long]) = {
    +    val taskPortRanges = getRangeResourceWithRoleInfo(ports.asJava, 
"ports")
    +    val portsToCheck = List(conf.getInt("spark.executor.port", 0).toLong,
    --- End diff --
    
    which part? 


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