[SPARK-3067] JobProgressPage could not show Fair Scheduler Pools section sometimes

Author: YanTangZhai

core/src/main/scala/org/apache/spark/SparkContext.scala

@@ -221,7 +221,6 @@ class SparkContext(config: SparkConf) extends Logging {
 
   // Initialize the Spark UI, registering all associated listeners
   private[spark] val ui = new SparkUI(this)
-  ui.bind()
 
   /** A default Hadoop Configuration for the Hadoop code (e.g. file systems) that we reuse. */
   val hadoopConfiguration: Configuration = {
@@ -334,6 +333,9 @@ class SparkContext(config: SparkConf) extends Logging {
   postEnvironmentUpdate()
   postApplicationStart()
 
+  // Starting Spark UI service
+  ui.bind()
+
   private[spark] var checkpointDir: Option[String] = None
 
   // Thread Local variable that can be used by users to pass information down the stack