spark-reviews mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From squito <...@git.apache.org>
Subject [GitHub] spark pull request #14079: [SPARK-8425][CORE] New Blacklist Mechanism
Date Wed, 21 Sep 2016 21:16:28 GMT
Github user squito commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14079#discussion_r79934546
  
    --- 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 --
    
    The point is to make sure that we don't blacklist executor 2 later on, which is checked
by other asserts later on.  Might sound like a random check, but I actually had this wrong
at one point :P


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscribe@spark.apache.org
For additional commands, e-mail: reviews-help@spark.apache.org


Mime
View raw message