make profiler lazy

Author: wForget

connector/profiler/src/main/scala/org/apache/spark/profiler/SparkAsyncProfiler.scala

@@ -69,7 +69,7 @@ private[spark] class SparkAsyncProfiler(conf: SparkConf, executorId: String) ext
   lazy private val extractionDir =
     Utils.createTempDir(Utils.getLocalDir(conf), "asyncProfiler").toPath
 
-  val profiler: Option[AsyncProfiler] = {
+  lazy val profiler: Option[AsyncProfiler] = {
     Option(
       if (enableProfiler && AsyncProfilerLoader.isSupported) {
         AsyncProfilerLoader.setExtractionDirectory(extractionDir)