nit space

Author: shahidki31

core/src/main/scala/org/apache/spark/status/AppHistoryServerPlugin.scala

@@ -31,7 +31,11 @@ private[spark] trait AppHistoryServerPlugin {
    */
   def createListeners(conf: SparkConf, store: ElementTrackingStore): Seq[SparkListener]
 
+  /**
+    * Initialize the listener parameters for incremental parsing of the event logs.
+    */
   def initialize(sparkListener: SparkListener, appId: String, attemptId: Option[String]): Unit = {}
+
   /**
    * Sets up UI of this plugin to rebuild the history UI.
    */

sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/ui/HiveThriftServer2HistoryServerPlugin.scala

@@ -34,6 +34,7 @@ class HiveThriftServer2HistoryServerPlugin extends AppHistoryServerPlugin {
       attemptId: Option[String]): Unit = {
     sparkListener.asInstanceOf[HiveThriftServer2Listener].initialize(appId, attemptId)
   }
+
   override def setupUI(ui: SparkUI): Unit = {
     val store = new HiveThriftServer2AppStatusStore(ui.store.store)
     if (store.getSessionCount > 0) {