Github user kayousterhout commented on a diff in the pull request: https://github.com/apache/spark/pull/14079#discussion_r77296072 --- 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) --- End diff -- badIndex? badTaskIndex? (I'm guessing this is leftover from the old partition naming)
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