disable stage executor metrics logging by default

core/src/main/scala/org/apache/spark/executor/Executor.scala

@@ -217,7 +217,12 @@ private[spark] class Executor(
 
   def stop(): Unit = {
     env.metricsSystem.report()
-    heartbeater.stop()
+    try {
+      heartbeater.stop()
+    } catch {
+      case NonFatal(e) =>
+        logWarning("Unable to stop heartbeater", e)
+     }
     threadPool.shutdown()
     if (!isLocal) {
       env.stop()

core/src/main/scala/org/apache/spark/internal/config/package.scala

@@ -72,7 +72,7 @@ package object config {
   private[spark] val EVENT_LOG_STAGE_EXECUTOR_METRICS =
     ConfigBuilder("spark.eventLog.logStageExecutorMetrics.enabled")
       .booleanConf
-      .createWithDefault(true)
+      .createWithDefault(false)
 
   private[spark] val EVENT_LOG_OVERWRITE =
     ConfigBuilder("spark.eventLog.overwrite").booleanConf.createWithDefault(false)

core/src/test/scala/org/apache/spark/deploy/history/HistoryServerSuite.scala

@@ -82,6 +82,7 @@ class HistoryServerSuite extends SparkFunSuite with BeforeAndAfter with Matchers
       .set("spark.history.fs.update.interval", "0")
       .set("spark.testing", "true")
       .set(LOCAL_STORE_DIR, storeDir.getAbsolutePath())
+      .set("spark.eventLog.logStageExecutorMetrics.enabled", "true")
     conf.setAll(extraConf)
     provider = new FsHistoryProvider(conf)
     provider.checkForLogs()

core/src/test/scala/org/apache/spark/scheduler/EventLoggingListenerSuite.scala

@@ -517,6 +517,7 @@ object EventLoggingListenerSuite {
       conf.set("spark.eventLog.compress", "true")
       conf.set("spark.io.compression.codec", codec)
     }
+    conf.set("spark.eventLog.logStageExecutorMetrics.enabled", "true")
     conf
   }