Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/1777#discussion_r15796941
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -1331,4 +1331,49 @@ private[spark] object Utils extends Logging {
.map { case (k, v) => s"-D$k=$v" }
}
+ /**
+ * Attempt to start a service on the given port, or fail after a number
of attempts.
+ * Each subsequent attempt uses 1 + the port used in the previous
attempt.
+ *
+ * @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.
+ * @throws SparkException When unable to start the service after a given
number of attempts
+ */
+ def startServiceOnPort[T](
+ startPort: Int,
+ startService: Int => (T, Int),
+ serviceName: String = "",
+ maxRetries: Int = 3): (T, Int) = {
--- End diff --
sounds good
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