Breaking out into two tests

Author: pwendell

core/src/main/scala/org/apache/spark/MapOutputTracker.scala

@@ -46,8 +46,15 @@ private[spark] class MapOutputTrackerMasterActor(tracker: MapOutputTrackerMaster
       val mapOutputStatuses = tracker.getSerializedMapOutputStatuses(shuffleId)
       val serializedSize = mapOutputStatuses.size
       if (serializedSize > maxAkkaFrameSize) {
-        throw new SparkException(s"Map output statuses were $serializedSize bytes which " +
-          s"exceeds spark.akka.frameSize ($maxAkkaFrameSize bytes).")
+        val msg = s"Map output statuses were $serializedSize bytes which " +
+          s"exceeds spark.akka.frameSize ($maxAkkaFrameSize bytes)."
+       /**
+        * For SPARK-1244 we'll opt for just logging an error and then throwing an exception.
+        * Note that on exception the actor will just restart. A bigger refactoring (SPARK-1239)
+        * will utlimately remove this entire code path.
+        */
+        logError(msg)
+        throw new SparkException(msg)
       }
       sender ! mapOutputStatuses
 

core/src/test/scala/org/apache/spark/MapOutputTrackerSuite.scala

@@ -143,7 +143,7 @@ class MapOutputTrackerSuite extends FunSuite with LocalSparkContext {
     intercept[FetchFailedException] { slaveTracker.getServerStatuses(10, 0) }
   }
 
-  test("remote fetch exceeding akka frame size") {
+  test("remote fetch exceeds akka frame size") {
     val newConf = new SparkConf
     newConf.set("spark.akka.frameSize", "1")
     newConf.set("spark.akka.askTimeout", "1") // Fail fast
@@ -154,18 +154,32 @@ class MapOutputTrackerSuite extends FunSuite with LocalSparkContext {
       new MapOutputTrackerMasterActor(masterTracker, newConf))(actorSystem)
     val masterActor = actorRef.underlyingActor
 
-    // Frame size should be ~123B, and no exception should be thrown
-    masterTracker.registerShuffle(10, 1)
-    masterTracker.registerMapOutput(10, 0, new MapStatus(
-      BlockManagerId("88", "mph", 1000, 0), Array.fill[Byte](10)(0)))
-    masterActor.receive(GetMapOutputStatuses(10))
-
-    // Frame size should be ~1.1MB, and MapOutputTrackerMasterActor should throw exception
+    // Frame size should be ~1.1MB, and MapOutputTrackerMasterActor should throw exception.
+    // Note that the size is hand-selected here because map output statuses are compressed before
+    // being sent.
     masterTracker.registerShuffle(20, 100)
     (0 until 100).foreach { i =>
       masterTracker.registerMapOutput(20, i, new MapStatus(
         BlockManagerId("999", "mps", 1000, 0), Array.fill[Byte](4000000)(0)))
     }
     intercept[SparkException] { masterActor.receive(GetMapOutputStatuses(20)) }
   }
+
+  test("remote fetch below akka frame size") {
+    val newConf = new SparkConf
+    newConf.set("spark.akka.frameSize", "1")
+    newConf.set("spark.akka.askTimeout", "1") // Fail fast
+
+    val masterTracker = new MapOutputTrackerMaster(conf)
+    val actorSystem = ActorSystem("test")
+    val actorRef = TestActorRef[MapOutputTrackerMasterActor](
+      new MapOutputTrackerMasterActor(masterTracker, newConf))(actorSystem)
+    val masterActor = actorRef.underlyingActor
+
+    // Frame size should be ~123B, and no exception should be thrown
+    masterTracker.registerShuffle(10, 1)
+    masterTracker.registerMapOutput(10, 0, new MapStatus(
+      BlockManagerId("88", "mph", 1000, 0), Array.fill[Byte](10)(0)))
+    masterActor.receive(GetMapOutputStatuses(10))
+  }
 }