Ngone51 commented on a change in pull request #28880:
URL: https://github.com/apache/spark/pull/28880#discussion_r444621048



##########
File path: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
##########
@@ -211,9 +211,11 @@ private[spark] class ApplicationMaster(
   final def run(): Int = {
     try {
       val attemptID = if (isClusterMode) {
-        // Set the web ui port to be ephemeral for yarn so we don't conflict 
with
-        // other spark processes running on the same box
-        System.setProperty(UI_PORT.key, "0")
+        // Set the web ui port to be ephemeral for yarn if not set explicitly
+        // so we don't conflict with other spark processes running on the same 
box
+        if (System.getProperty(UI_PORT.key) != null) {
+          System.setProperty(UI_PORT.key, "0")
+        }

Review comment:
       I don't get your point here. For the successful case, I only see the 
port range is 18018 ~ 18078 and the port 18051 is valid. Where are those ports 
18000, 18050, 18008?




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