added configuration

Author: chie8842

core/src/main/scala/org/apache/spark/ui/JettyUtils.scala

@@ -310,38 +310,27 @@ private[spark] object JettyUtils extends Logging {
         // If the new port wraps around, do not try a privileged port.
 
         require(sslOptions.port == 0 || (1024 <= sslOptions.port && sslOptions.port < 65536))
-        val maxRetries = Utils.portMaxRetries(conf)
 
-        val scheme = "https"
-        // Create a connector on port securePort to listen for HTTPS requests
-        var offset = 0
-        var connected = false
-        while (offset < maxRetries && connected == false) {
-          val securePort =
-            if (currentPort != 0) {
-              if (1024 < sslOptions.port && sslOptions.port < 65536) {
-                sslOptions.port + offset
-              } else {
-                (currentPort + 400 - 1024) % (65536 - 1024) + 1024
-              }
+        val securePort =
+          if (currentPort != 0) {
+            if (1024 < sslOptions.port && sslOptions.port < 65536) {
+              sslOptions.port
             } else {
-              0
+              (currentPort + 400 - 1024) % (65536 - 1024) + 1024
             }
-          val connector = new ServerConnector(server, factory)
-          connector.setPort(securePort)
-          connectors += connector
-          try{
-            // redirect the HTTP requests to HTTPS port
-            collection.addHandler(createRedirectHttpsHandler(securePort, scheme))
-            connected = true
-          } catch {
-            case e: Exception =>
-              if (offset >= maxRetries) {
-                throw e
-              }
+          } else {
+            0
           }
-          offset += 1
-        }
+        val scheme = "https"
+        // Create a connector on port securePort to listen for HTTPS requestswork.
+
+        val connector = new ServerConnector(server, factory)
+        connector.setPort(securePort)
+
+        connectors += connector
+
+        // redirect the HTTP requests to HTTPS port
+        collection.addHandler(createRedirectHttpsHandler(securePort, scheme))
       }
 
       gzipHandlers.foreach(collection.addHandler)

docs/configuration.md

@@ -1664,10 +1664,12 @@ Apart from these, the following properties are also available, and may be useful
         </td>
     </tr>
     <tr>
-        <td><code>spark.ssl.port</code></td>
-        <td>None</td>
+        <td><code>spark.ssl.<particular protocol>.port</code></td>
+        <td>0</td>
         <td>
-            A port number hen connecting with SSL.
+            A port number hen connecting with SSL. Default value 0 means to be determined automatically.
+            Attention that the port should be separated for each particular protocol.
+            Not configure as <code>spark.ssl.port<code> but configure <code>spark.ssl.<particular protocol>.port<code>.
         </td>
     </tr>
     <tr>