Github user WangTaoTheTonic commented on a diff in the pull request:
https://github.com/apache/spark/pull/5722#discussion_r29639912
--- 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 --
Nah...Like I said above:
>I think minPort and maxPort is the range that port will limited to (if
successfully), and maxRetries is the max retry times to try to bind.
But take another thought, these three configs are proposed for same reason
(limit port range #1777), and they maybe overlap but maxRetires is kinda global
setting.
So basically I think `spark.port.maxRetries` is kind of a global setting
while `min:max` is special for a single port.
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