add space after //

Author: pzzs

core/src/main/scala/org/apache/spark/util/ShutdownHookManager.scala

@@ -57,8 +57,8 @@ private[spark] object ShutdownHookManager extends Logging {
   // Add a shutdown hook to delete the temp dirs when the JVM exits
   addShutdownHook(TEMP_DIR_SHUTDOWN_PRIORITY) { () =>
     logInfo("Shutdown hook called")
-    //we need to materialize the paths to delete because deleteRecursively removes items from
-    //shutdownDeletePaths as we are traversing through it.
+    // we need to materialize the paths to delete because deleteRecursively removes items from
+    // shutdownDeletePaths as we are traversing through it.
     shutdownDeletePaths.toArray.foreach { dirPath =>
       try {
         logInfo("Deleting directory " + dirPath)