Add test to SparkListenerSuite

Author: tedyu

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

@@ -24,6 +24,7 @@ import scala.collection.JavaConverters._
 
 import org.scalatest.Matchers
 
+import org.apache.spark.SparkException
 import org.apache.spark.executor.TaskMetrics
 import org.apache.spark.util.ResetSystemProperties
 import org.apache.spark.{LocalSparkContext, SparkConf, SparkContext, SparkFunSuite}
@@ -36,6 +37,21 @@ class SparkListenerSuite extends SparkFunSuite with LocalSparkContext with Match
 
   val jobCompletionTime = 1421191296660L
 
+  test("don't call sc.stop in listener") {
+    sc = new SparkContext("local", "SparkListenerSuite")
+    val listener = new SparkContextStoppingListener(sc)
+    val bus = new LiveListenerBus
+    bus.addListener(listener)
+
+    // Starting listener bus should flush all buffered events
+    bus.start(sc)
+    bus.post(SparkListenerJobEnd(0, jobCompletionTime, JobSucceeded))
+    bus.waitUntilEmpty(WAIT_TIMEOUT_MILLIS)
+
+    bus.stop()
+    assert(listener.sparkExSeen)
+  }
+
   test("basic creation and shutdown of LiveListenerBus") {
     val counter = new BasicJobCounter
     val bus = new LiveListenerBus
@@ -443,6 +459,21 @@ private class BasicJobCounter extends SparkListener {
   override def onJobEnd(job: SparkListenerJobEnd): Unit = count += 1
 }
 
+/**
+ * A simple listener that tries to stop SparkContext.
+ */
+private class SparkContextStoppingListener(val sc: SparkContext) extends SparkListener {
+  @volatile var sparkExSeen = false
+  override def onJobEnd(job: SparkListenerJobEnd): Unit = {
+    try {
+      sc.stop()
+    } catch {
+      case se: SparkException =>
+        sparkExSeen = true
+    }
+  }
+}
+
 private class ListenerThatAcceptsSparkConf(conf: SparkConf) extends SparkListener {
   var count = 0
   override def onJobEnd(job: SparkListenerJobEnd): Unit = count += 1