[SPARK-29152][2.4][CORE] Executor Plugin shutdown when dynamic allocation is enabled

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

@@ -24,6 +24,7 @@ import java.net.{URI, URL}
 import java.nio.ByteBuffer
 import java.util.Properties
 import java.util.concurrent._
+import java.util.concurrent.atomic.AtomicBoolean
 import javax.annotation.concurrent.GuardedBy
 
 import scala.collection.JavaConverters._
@@ -72,6 +73,10 @@ private[spark] class Executor(
 
   private val conf = env.conf
 
+  private val executorShutdown = new AtomicBoolean(false)
+  ShutdownHookManager.addShutdownHook(
+    () => stop()
+  )
   // No ip or host:port - just hostname
   Utils.checkHost(executorHostname)
   // must not have port specified.
@@ -244,24 +249,26 @@ private[spark] class Executor(
   }
 
   def stop(): Unit = {
-    env.metricsSystem.report()
-    heartbeater.shutdown()
-    heartbeater.awaitTermination(10, TimeUnit.SECONDS)
-    threadPool.shutdown()
-
-    // Notify plugins that executor is shutting down so they can terminate cleanly
-    Utils.withContextClassLoader(replClassLoader) {
-      executorPlugins.foreach { plugin =>
-        try {
-          plugin.shutdown()
-        } catch {
-          case e: Exception =>
-            logWarning("Plugin " + plugin.getClass().getCanonicalName() + " shutdown failed", e)
+    if (!executorShutdown.getAndSet(true)) {
+      env.metricsSystem.report()
+      heartbeater.shutdown()
+      heartbeater.awaitTermination(10, TimeUnit.SECONDS)
+      threadPool.shutdown()
+
+      // Notify plugins that executor is shutting down so they can terminate cleanly
+      Utils.withContextClassLoader(replClassLoader) {
+        executorPlugins.foreach { plugin =>
+          try {
+            plugin.shutdown()
+          } catch {
+            case e: Exception =>
+              logWarning("Plugin " + plugin.getClass().getCanonicalName() + " shutdown failed", e)
+          }
         }
       }
-    }
-    if (!isLocal) {
-      env.stop()
+      if (!isLocal) {
+        env.stop()
+      }
     }
   }