Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3841#discussion_r22828421
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -1709,17 +1706,20 @@ private[spark] object Utils extends Logging {
        * Each subsequent attempt uses 1 + the port used in the previous 
attempt (unless the port is 0).
        *
        * @param startPort The initial port to start the service on.
    -   * @param maxRetries Maximum number of retries to attempt.
    -   *                   A value of 3 means attempting ports n, n+1, n+2, 
and n+3, for example.
        * @param startService Function to start service on a given port.
        *                     This is expected to throw java.net.BindException 
on port collision.
    +   * @param conf Used to get maximum number of retries.
    --- End diff --
    
    A SparkConf used to get the maximum number of retries when binding to a port


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