Github user zhzhan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15541#discussion_r84129486
--- Diff:
core/src/test/scala/org/apache/spark/scheduler/TaskSchedulerImplSuite.scala ---
@@ -109,6 +108,85 @@ class TaskSchedulerImplSuite extends SparkFunSuite
with LocalSparkContext with B
assert(!failedTaskSet)
}
+ test("Scheduler does not always schedule tasks on the same workers") {
+ val taskScheduler = setupScheduler()
+ roundrobin(taskScheduler)
+ }
+
+ test("User can specify the roundrobin task assigner") {
+ val taskScheduler = setupScheduler(("spark.scheduler.taskAssigner",
"RoUndrObin"))
+ roundrobin(taskScheduler)
+ }
+
+ test("Fallback to roundrobin when the task assigner provided is not
valid") {
+ val taskScheduler = setupScheduler("spark.scheduler.taskAssigner" ->
"invalid")
+ roundrobin(taskScheduler)
+ }
+
+ test("Scheduler balance the assignment to the worker with more free
cores") {
--- End diff --
Will change the test case name to make it more explicit.
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