bmarcott commented on a change in pull request #27207: [SPARK-18886][CORE] Make
Locality wait time measure resource under utilization due to delay scheduling.
URL: https://github.com/apache/spark/pull/27207#discussion_r402739751
##########
File path:
core/src/test/scala/org/apache/spark/scheduler/TaskSchedulerImplSuite.scala
##########
@@ -196,6 +196,241 @@ class TaskSchedulerImplSuite extends SparkFunSuite with
LocalSparkContext with B
assert(!failedTaskSet)
}
+ def setupTaskScheduler(clock: ManualClock): TaskSchedulerImpl = {
+ val conf = new SparkConf()
+ sc = new SparkContext("local", "TaskSchedulerImplSuite", conf)
+ val taskScheduler = new TaskSchedulerImpl(sc,
+ sc.conf.get(config.TASK_MAX_FAILURES),
+ clock = clock) {
+ override def createTaskSetManager(taskSet: TaskSet, maxTaskFailures:
Int): TaskSetManager = {
+ new TaskSetManager(this, taskSet, maxTaskFailures,
blacklistTrackerOpt, clock)
+ }
+ override def shuffleOffers(offers: IndexedSeq[WorkerOffer]):
IndexedSeq[WorkerOffer] = {
+ // Don't shuffle the offers around for this test. Instead, we'll just
pass in all
+ // the permutations we care about directly.
+ offers
+ }
+ }
+ // Need to initialize a DAGScheduler for the taskScheduler to use for
callbacks.
+ new DAGScheduler(sc, taskScheduler) {
+ override def taskStarted(task: Task[_], taskInfo: TaskInfo): Unit = {}
+
+ override def executorAdded(execId: String, host: String): Unit = {}
+ }
+ taskScheduler.initialize(new FakeSchedulerBackend)
+ val taskSet = FakeTask.createTaskSet(8, 1, 1,
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1")),
+ Seq(TaskLocation("host1", "exec1"))
+ )
+
+ // Offer resources first so that when the taskset is submitted it can
initialize
+ // with proper locality level. Otherwise, ANY would be the only locality
level.
+ // See TaskSetManager.computeValidLocalityLevels()
+ // This begins the task set as PROCESS_LOCAL locality level
+ taskScheduler.resourceOffers(IndexedSeq(WorkerOffer("exec1", "host1", 1)))
+ taskScheduler.submitTasks(taskSet)
+ taskScheduler
+ }
+
+ test("SPARK-18886 - partial offers (isAllFreeResources = false) reset timer
before " +
+ "any resources have been rejected") {
+ val clock = new ManualClock()
+ // All tasks created here are local to exec1, host1.
+ // Locality level starts at PROCESS_LOCAL.
+ val taskScheduler = setupTaskScheduler(clock)
+ // Locality levels increase at 3000 ms.
+ val advanceAmount = 3000
+
+ // Advancing clock increases locality level to NODE_LOCAL.
+ clock.advance(advanceAmount)
+
+ // If there hasn't yet been any full resource offers,
+ // partial resource (isAllFreeResources = false) offers reset delay
scheduling
+ // if this and previous offers were accepted.
+ // This line resets the timer and locality level is reset to PROCESS_LOCAL.
+ assert(taskScheduler
+ .resourceOffers(
+ IndexedSeq(WorkerOffer("exec1", "host1", 1)),
+ isAllFreeResources = false)
+ .flatten.length === 1)
+
+ // This NODE_LOCAL task should not be accepted.
+ assert(taskScheduler
+ .resourceOffers(
+ IndexedSeq(WorkerOffer("exec2", "host1", 1)),
+ isAllFreeResources = false)
+ .flatten.isEmpty)
+ }
+
+ test("SPARK-18886 - delay scheduling timer is reset when it accepts all
resources offered when" +
+ "isAllFreeResources = true") {
Review comment:
good 👀
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