Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/14079#discussion_r77297807
--- Diff:
core/src/test/scala/org/apache/spark/scheduler/BlacklistTrackerSuite.scala ---
@@ -0,0 +1,503 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.scheduler
+
+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 blacklistTracker: BlacklistTracker = _
+
+ override def afterEach(): Unit = {
+ if (blacklistTracker != null) {
+ blacklistTracker = null
+ }
+ super.afterEach()
+ }
+
+ val allOptions = (('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 = {
+ allOptions.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
+ }
+
+ test("Blacklisting individual tasks") {
+ val conf = new SparkConf().setAppName("test").setMaster("local")
+ .set(config.BLACKLIST_ENABLED.key, "true")
+ val scheduler = mockTaskSchedWithConf(conf)
+ // Task 1 failed on executor 1
+ blacklistTracker = new BlacklistTracker(conf, clock)
+ val taskSet = FakeTask.createTaskSet(10)
+ val tsm = new TaskSetManager(scheduler, Some(blacklistTracker),
taskSet, 4, clock)
+ tsm.updateBlacklistForFailedTask("hostA", "1", 0)
+ for {
+ executor <- (1 to 4).map(_.toString)
+ index <- 0 until 10
+ } {
+ val exp = (executor == "1" && index == 0)
+ assert(tsm.isExecutorBlacklistedForTask(executor, index) === exp)
+ }
+ assert(blacklistTracker.nodeBlacklist() === Set())
+ assertEquivalentToSet(blacklistTracker.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(tsm.isNodeBlacklistedForTaskSet, Set())
+ assertEquivalentToSet(tsm.isExecutorBlacklistedForTaskSet, Set())
+
+ // Task 1 & 2 failed on both executor 1 & 2, so we blacklist all
executors on that host,
+ // for all tasks for the stage. Note the api expects multiple checks
for each type of
+ // blacklist -- this actually fits naturally with its use in the
scheduler
+ tsm.updateBlacklistForFailedTask("hostA", "1", 1)
+ tsm.updateBlacklistForFailedTask("hostA", "2", 0)
+ tsm.updateBlacklistForFailedTask("hostA", "2", 1)
+ // we don't explicitly return the executors in hostA here, but that is
OK
+ for {
+ executor <- (1 to 4).map(_.toString)
+ index <- 0 until 10
+ } {
+ withClue(s"exec = $executor; index = $index") {
+ val badExec = (executor == "1" || executor == "2")
+ val badPart = (index == 0 || index == 1)
+ val taskExp = (badExec && badPart)
+ assert(
+ tsm.isExecutorBlacklistedForTask(executor, index) === taskExp)
+ val executorExp = badExec
+ assert(tsm.isExecutorBlacklistedForTaskSet(executor) ===
executorExp)
+ }
+ }
+ assertEquivalentToSet(tsm.isNodeBlacklistedForTaskSet, Set("hostA"))
+ // we dont' blacklist the nodes or executors till the stages complete
+ assert(blacklistTracker.nodeBlacklist() === Set())
+ assertEquivalentToSet(blacklistTracker.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(blacklistTracker.isExecutorBlacklisted(_), Set())
+
+ // when the stage completes successfully, now there is sufficient
evidence we've got
+ // bad executors and node
+ blacklistTracker.updateBlacklistForSuccessfulTaskSet(0, 0,
tsm.execToFailures)
+ assert(blacklistTracker.nodeBlacklist() === Set("hostA"))
+ assertEquivalentToSet(blacklistTracker.isNodeBlacklisted(_),
Set("hostA"))
+ assertEquivalentToSet(blacklistTracker.isExecutorBlacklisted(_),
Set("1", "2"))
+
+ clock.advance(blacklistTracker.BLACKLIST_TIMEOUT_MILLIS + 1)
+ blacklistTracker.applyBlacklistTimeout()
+ assert(blacklistTracker.nodeBlacklist() === Set())
+ assertEquivalentToSet(blacklistTracker.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(blacklistTracker.isExecutorBlacklisted(_), Set())
+ }
+
+ def trackerFixture: (BlacklistTracker, TaskSchedulerImpl) = {
+ trackerFixture()
+ }
+
+ def trackerFixture(confs: (String, String)*): (BlacklistTracker,
TaskSchedulerImpl) = {
+ val conf = new SparkConf().setAppName("test").setMaster("local")
+ .set(config.BLACKLIST_ENABLED.key, "true")
+ confs.foreach { case (k, v) => conf.set(k, v) }
+ val scheduler = mockTaskSchedWithConf(conf)
+
+ clock.setTime(0)
+ blacklistTracker = new BlacklistTracker(conf, clock)
+ (blacklistTracker, scheduler)
+ }
+
+ test("executors can be blacklisted with only a few failures per stage") {
+ val (tracker, scheduler) = trackerFixture
+ // 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
+ (0 until 4).foreach { stage =>
+ val taskSet = FakeTask.createTaskSet(1)
+ val tsm = new TaskSetManager(scheduler, Some(tracker), taskSet, 4,
clock)
+ tsm.updateBlacklistForFailedTask("hostA", "1", 0)
+ tracker.updateBlacklistForSuccessfulTaskSet(stage, 0,
tsm.execToFailures)
+ }
+ assertEquivalentToSet(tracker.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") {
+ val (tracker, scheduler) = trackerFixture
+ // for 4 different stages, executor 1 fails a task, and then the
taskSet fails.
+ (0 until 4).foreach { stage =>
+ val taskSet = FakeTask.createTaskSet(1)
+ val tsm = new TaskSetManager(scheduler, Some(tracker), taskSet, 4,
clock)
+ tsm.updateBlacklistForFailedTask("hostA", "1", 0)
+ }
+ assertEquivalentToSet(tracker.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.
+ val (tracker, scheduler) = trackerFixture
+ val stageId = 1 + (if (succeedTaskSet) 1 else 0)
+ val taskSet = FakeTask.createTaskSet(4, stageId, 0)
+ val tsm = new TaskSetManager(scheduler, Some(tracker), taskSet, 4,
clock)
+ (0 until 4).foreach { partition =>
+ tsm.updateBlacklistForFailedTask("hostA", "1", partition)
+ }
+ assert(tsm.isExecutorBlacklistedForTaskSet("1"))
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set())
+ if (succeedTaskSet) {
+ // the task set succeeded elsewhere, so we count those failures
against our executor,
+ // and blacklist it across stages
+ tracker.updateBlacklistForSuccessfulTaskSet(stageId, 0,
tsm.execToFailures)
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set("1"))
+ } else {
+ // the task set failed, so we don't count these failures against
the executor for other
+ // stages
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set())
+ }
+ }
+ }
+
+ test("blacklisted executors and nodes get recovered with time") {
+ val (tracker, scheduler) = trackerFixture
+ val taskSet0 = FakeTask.createTaskSet(4)
+ val tsm0 = new TaskSetManager(scheduler, Some(tracker), taskSet0, 4,
clock)
+ (0 until 4).foreach { partition =>
+ tsm0.updateBlacklistForFailedTask("hostA", "1", partition)
+ }
+ tracker.updateBlacklistForSuccessfulTaskSet(0, 0, tsm0.execToFailures)
+ assert(tracker.nodeBlacklist() === Set())
+ assertEquivalentToSet(tracker.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set("1"))
+
+ val taskSet1 = FakeTask.createTaskSet(4, 1, 0)
+ val tsm1 = new TaskSetManager(scheduler, Some(tracker), taskSet1, 4,
clock)
+ (0 until 4).foreach { partition =>
+ tsm1.updateBlacklistForFailedTask("hostA", "2", partition)
+ }
+ tracker.updateBlacklistForSuccessfulTaskSet(0, 0, tsm1.execToFailures)
+ assert(tracker.nodeBlacklist() === Set("hostA"))
+ assertEquivalentToSet(tracker.isNodeBlacklisted(_), Set("hostA"))
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set("1", "2"))
+
+ clock.advance(tracker.BLACKLIST_TIMEOUT_MILLIS + 1)
+ tracker.applyBlacklistTimeout()
+ assert(tracker.nodeBlacklist() === Set())
+ assertEquivalentToSet(tracker.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set())
+
+ // fail one more task, but executor isn't put back into blacklist
since count reset to 0
+ val taskSet2 = FakeTask.createTaskSet(4, 2, 0)
+ val tsm2 = new TaskSetManager(scheduler, Some(tracker), taskSet2, 4,
clock)
+ tsm2.updateBlacklistForFailedTask("hostA", "1", 0)
+ tracker.updateBlacklistForSuccessfulTaskSet(2, 0, tsm2.execToFailures)
+ assert(tracker.nodeBlacklist() === Set())
+ assertEquivalentToSet(tracker.isNodeBlacklisted(_), Set())
+ assertEquivalentToSet(tracker.isExecutorBlacklisted(_), Set())
+ }
+
+ test("blacklist can handle lost executors") {
+ // The blacklist should still work if an executor is killed
completely. We should still
+ // be able to blacklist the entire node.
+ val (tracker, scheduler) = trackerFixture
+ val taskSet0 = FakeTask.createTaskSet(4)
+ val tsm0 = new TaskSetManager(scheduler, Some(tracker), taskSet0, 4,
clock)
+ // Lets say that executor 1 dies completely. We get a task failure
for the last task, but
+ // the taskset then finishes successfully (elsewhere).
+ (0 until 4).foreach { partition =>
+ tsm0.updateBlacklistForFailedTask("hostA", "1", partition)
+ }
+ tracker.handleRemovedExecutor("1")
+ tracker.updateBlacklistForSuccessfulTaskSet(0, 0, tsm0.execToFailures)
+ assert(tracker.isExecutorBlacklisted("1"))
+ clock.advance(tracker.BLACKLIST_TIMEOUT_MILLIS / 2)
+
+ // Now another executor gets spun up on that host, but it also dies.
+ val taskSet1 = FakeTask.createTaskSet(4, 1, 0)
+ val tsm1 = new TaskSetManager(scheduler, Some(tracker), taskSet1, 4,
clock)
+ (0 until 4).foreach { partition =>
+ tsm1.updateBlacklistForFailedTask("hostA", "2", partition)
+ }
+ tracker.handleRemovedExecutor("2")
+ tracker.updateBlacklistForSuccessfulTaskSet(1, 0, tsm1.execToFailures)
+ // We've now had two bad executors on the hostA, so we should
blacklist the entire node.
+ assert(tracker.isExecutorBlacklisted("1"))
+ assert(tracker.isExecutorBlacklisted("2"))
+ assert(tracker.isNodeBlacklisted("hostA"))
+
+ clock.advance(tracker.BLACKLIST_TIMEOUT_MILLIS / 2 + 1)
+ tracker.applyBlacklistTimeout()
+ // executor 1 is no longer explicitly blacklisted, since we've gone
past its recovery time,
+ // but everything else is still blacklisted.
+ assert(!tracker.isExecutorBlacklisted("1"))
+ assert(tracker.isExecutorBlacklisted("2"))
+ assert(tracker.isNodeBlacklisted("hostA"))
+ // make sure we don't leak memory
+ assert(!tracker.executorIdToBlacklistStatus.contains("1"))
+ assert(!tracker.nodeToFailedExecs("hostA").contains("1"))
+ clock.advance(tracker.BLACKLIST_TIMEOUT_MILLIS)
+ tracker.applyBlacklistTimeout()
+ assert(!tracker.nodeIdToBlacklistExpiryTime.contains("hostA"))
+ }
+
+ test("task failures expire with time") {
+ val (tracker, scheduler) = trackerFixture
+ var stageId = 0
+ def failOneTaskInTaskSet(exec: String): Unit = {
+ val taskSet = FakeTask.createTaskSet(1, stageId, 0)
+ val tsm = new TaskSetManager(scheduler, Some(tracker), taskSet, 1,
clock)
+ tsm.updateBlacklistForFailedTask("host-" + exec, exec, 0)
+ tracker.updateBlacklistForSuccessfulTaskSet(stageId, 0,
tsm.execToFailures)
+ stageId += 1
+ }
+ failOneTaskInTaskSet("1")
+ // We have one sporadic failure on exec 2 -- it doesn't lead to an
exec blacklist.
+ failOneTaskInTaskSet("2")
--- End diff --
why do you need the exec 2 failure here? it seems like the rest of the test
deals with exec 1
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