Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5722#discussion_r29648064
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -1959,30 +1959,41 @@ private[spark] object Utils extends Logging {
* 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 (unless the port is 0).
*
- * @param startPort The initial port to start the service on.
+ * @param port The minimum and maximum port to start the service on,
separated by colon.
+ * If just set one number, take it as the minimum.
* @param startService Function to start service on a given port.
* This is expected to throw java.net.BindException
on port collision.
* @param conf A SparkConf used to get the maximum number of retries
when binding to a port.
* @param serviceName Name of the service.
*/
def startServiceOnPort[T](
- startPort: Int,
+ port: String,
startService: Int => (T, Int),
conf: SparkConf,
serviceName: String = ""): (T, Int) = {
-
- require(startPort == 0 || (1024 <= startPort && startPort < 65536),
- "startPort should be between 1024 and 65535 (inclusive), or 0 for a
random free port.")
+ val maxRetries = portMaxRetries(conf)
+ val ports = port.split(":", 2)
+ val (minPort, maxPort) = if (ports.length == 2) {
+ (ports(0).toInt, ports(1).toInt)
+ } else {
+ val _minPort = ports(0).toInt
+ (_minPort, math.min(65535, _minPort + maxRetries))
+ }
+ require(minPort == 0 || (1024 <= minPort && minPort <= 65535),
+ s"Minimum port ${minPort} should be between 1024 and 65535
(inclusive)," +
+ " or 0 for a random free port.")
+ require((1024 <= maxPort && maxPort <= 65535),
+ s"Maximum port ${maxPort} should be between 1024 and 65535
(inclusive).")
+ require(minPort <= maxPort, s"Minimum ${minPort} port should not be" +
+ s" less than the maximum ${maxPort}.")
val serviceString = if (serviceName.isEmpty) "" else s" '$serviceName'"
- val maxRetries = portMaxRetries(conf)
for (offset <- 0 to maxRetries) {
--- End diff --
@vanzin since you may for example want a single port for one setting, a
tight range of 3 for another, and a wide range of 100 for another. I could
conceive that you want to choose from potentially 100 ports, but not retry 100
times, or specify 1 port but actually allow some retries. But I do agree that
`maxRetries` becomes largely redundant with this change.
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