Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/6652#discussion_r31777847
--- Diff: core/src/test/scala/org/apache/spark/MapOutputTrackerSuite.scala
---
@@ -205,4 +205,29 @@ class MapOutputTrackerSuite extends SparkFunSuite {
// masterTracker.stop() // this throws an exception
rpcEnv.shutdown()
}
+
+ test("getLocationsWithLargestOutputs with multiple outputs in same
machine") {
+ val rpcEnv = createRpcEnv("test")
+ val tracker = new MapOutputTrackerMaster(conf)
+ tracker.trackerEndpoint =
rpcEnv.setupEndpoint(MapOutputTracker.ENDPOINT_NAME,
+ new MapOutputTrackerMasterEndpoint(rpcEnv, tracker, conf))
+ // Setup 3 map tasks
+ // on hostA with output size 1
+ // on hostA with output size 1
+ // on hostB with output size 2
--- End diff --
Can you do 2, 2, 3 as the sizes here? Otherwise this seems
non-deterministic, since the two machines have equal sizes of data?
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