Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5722#discussion_r29691883
--- 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 --
> After this, a single port will mean a single port only.
I don't think that's the case in the current code. And in any case, the
behaviour could become that without changing the property names, otherwise it
would break backwards compatibility.
In any case, it just seems extremely confusing to be able to specify a max
but not have that really take effect unless you also modify some other
property. That doesn't add anything to the existing behavior (which is already
a range, except the mas is implicit by being `min + maxRetries`). It makes the
feature pretty useless in my view.
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