Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/14079#discussion_r86611783
--- Diff:
core/src/test/scala/org/apache/spark/scheduler/BlacklistTrackerSuite.scala ---
@@ -17,10 +17,299 @@
package org.apache.spark.scheduler
-import org.apache.spark.{SparkConf, SparkFunSuite}
+import org.mockito.Mockito.when
+import org.scalatest.BeforeAndAfterEach
+import org.scalatest.mock.MockitoSugar
+
+import org.apache.spark._
import org.apache.spark.internal.config
+import org.apache.spark.util.ManualClock
+
+class BlacklistTrackerSuite extends SparkFunSuite with BeforeAndAfterEach
with MockitoSugar
+ with LocalSparkContext {
+
+ private val clock = new ManualClock(0)
+
+ private var blacklist: BlacklistTracker = _
+ private var scheduler: TaskSchedulerImpl = _
+ private var conf: SparkConf = _
+
+ override def afterEach(): Unit = {
+ if (blacklist != null) {
+ blacklist = null
+ }
+ if (scheduler != null) {
+ scheduler.stop()
+ scheduler = null
+ }
+ super.afterEach()
+ }
+
+ val allExecutorAndHostIds = (('A' to 'Z').map("host" + _) ++ (1 to
100).map{_.toString}).toSet
+
+ /**
+ * Its easier to write our tests as if we could directly look at the
sets of nodes & executors in
+ * the blacklist. However the api doesn't expose a set (for
thread-safety), so this is a simple
+ * way to test something similar, since we know the universe of values
that might appear in these
+ * sets.
+ */
+ def assertEquivalentToSet(f: String => Boolean, expected: Set[String]):
Unit = {
+ allExecutorAndHostIds.foreach { opt =>
+ val actual = f(opt)
+ val exp = expected.contains(opt)
+ assert(actual === exp, raw"""for string "$opt" """)
+ }
+ }
+
+ def mockTaskSchedWithConf(conf: SparkConf): TaskSchedulerImpl = {
+ sc = new SparkContext(conf)
+ val scheduler = mock[TaskSchedulerImpl]
+ when(scheduler.sc).thenReturn(sc)
+
when(scheduler.mapOutputTracker).thenReturn(SparkEnv.get.mapOutputTracker)
+ scheduler
+ }
-class BlacklistTrackerSuite extends SparkFunSuite {
+ def createTaskSetBlacklist(stageId: Int = 0): TaskSetBlacklist = {
+ new TaskSetBlacklist(conf, stageId, clock)
+ }
+
+ def configureBlacklistAndScheduler(confs: (String, String)*): Unit = {
+ conf = new SparkConf().setAppName("test").setMaster("local")
+ .set(config.BLACKLIST_ENABLED.key, "true")
+ confs.foreach { case (k, v) => conf.set(k, v) }
+ scheduler = mockTaskSchedWithConf(conf)
+
+ clock.setTime(0)
+ blacklist = new BlacklistTracker(conf, clock)
+ }
+
+ test("executors can be blacklisted with only a few failures per stage") {
+ configureBlacklistAndScheduler()
+ // for 4 different stages, executor 1 fails a task, then executor 2
succeeds the task,
+ // and then the task set is done. Not enough failures to blacklist
the executor *within*
+ // any particular taskset, but we still blacklist the executor overall
eventually.
+ // Also, we intentionally have a mix of task successes and failures --
there are even some
+ // successes after the executor is blacklisted. The idea here is
those tasks get scheduled
+ // before the executor is blacklisted. We might get successes after
blacklisting (because the
+ // executor might be flaky but not totally broken). But successes do
not unblacklist the
+ // executor.
+ val failuresTillBlacklisted = conf.get(config.MAX_FAILURES_PER_EXEC)
+ var failuresSoFar = 0
+ (0 until failuresTillBlacklisted * 10).foreach { stage =>
+ val taskSetBlacklist = createTaskSetBlacklist(stage)
+ if (stage % 2 == 0) {
+ // fail every other task
+ taskSetBlacklist.updateBlacklistForFailedTask("hostA", exec = "1",
index = 0)
+ failuresSoFar += 1
+ }
+ blacklist.updateBlacklistForSuccessfulTaskSet(stage, 0,
taskSetBlacklist.execToFailures)
+ assert(failuresSoFar == stage / 2 + 1)
+ if (failuresSoFar < failuresTillBlacklisted) {
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set())
+ } else {
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set("1"))
+ }
+ }
+ }
+
+ // if an executor has many task failures, but the task set ends up
failing, don't count it
+ // against the executor
+ test("executors aren't blacklisted if task sets fail") {
+ configureBlacklistAndScheduler()
+ // for 4 different stages, executor 1 fails a task, and then the
taskSet fails.
+ (0 until 4).foreach { stage =>
+ val taskSetBlacklist = createTaskSetBlacklist(stage)
+ taskSetBlacklist.updateBlacklistForFailedTask("hostA", exec = "1",
index = 0)
+ }
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set())
+ }
+
+ Seq(true, false).foreach { succeedTaskSet =>
+ test(s"stage blacklist updates correctly on stage completion
($succeedTaskSet)") {
+ // within one taskset, an executor fails a few times, so its
blacklisted for the taskset.
+ // but if the taskset fails, we don't blacklist the executor after
the stage.
+ configureBlacklistAndScheduler()
+ val stageId = 1 + (if (succeedTaskSet) 1 else 0)
+ val taskSetBlacklist = createTaskSetBlacklist(stageId)
+ (0 until 4).foreach { index =>
+ taskSetBlacklist.updateBlacklistForFailedTask("hostA", exec = "1",
index = index)
+ }
+ assert(taskSetBlacklist.isExecutorBlacklistedForTaskSet("1"))
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set())
+ if (succeedTaskSet) {
+ // the task set succeeded elsewhere, so we count those failures
against our executor,
+ // and blacklist it across stages
+ blacklist.updateBlacklistForSuccessfulTaskSet(stageId, 0,
taskSetBlacklist.execToFailures)
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set("1"))
+ } else {
+ // the task set failed, so we don't count these failures against
the executor for other
+ // stages
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set())
+ }
+ }
+ }
+
+ test("blacklisted executors and nodes get recovered with time") {
+ configureBlacklistAndScheduler()
+ val taskSetBlacklist0 = createTaskSetBlacklist(stageId = 0)
+ (0 until 4).foreach { partition =>
+ taskSetBlacklist0.updateBlacklistForFailedTask("hostA", exec = "1",
index = partition)
+ }
+ blacklist.updateBlacklistForSuccessfulTaskSet(0, 0,
taskSetBlacklist0.execToFailures)
+ assert(blacklist.nodeBlacklist() === Set())
+ assertEquivalentToSet(blacklist.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set("1"))
+
+ val taskSetBlacklist1 = createTaskSetBlacklist(stageId = 1)
+ (0 until 4).foreach { partition =>
+ taskSetBlacklist1.updateBlacklistForFailedTask("hostA", exec = "2",
index = partition)
+ }
+ blacklist.updateBlacklistForSuccessfulTaskSet(0, 0,
taskSetBlacklist1.execToFailures)
+ assert(blacklist.nodeBlacklist() === Set("hostA"))
+ assertEquivalentToSet(blacklist.isNodeBlacklisted(_), Set("hostA"))
+ assertEquivalentToSet(blacklist.isExecutorBlacklisted(_), Set("1",
"2"))
+
+ clock.advance(blacklist.BLACKLIST_TIMEOUT_MILLIS + 1)
--- End diff --
// Advance the clock and then make sure hostA and executors 1 and 2 have
been removed from the blacklist
---
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