squito commented on a change in pull request #24704: [SPARK-20286][core] Improve logic for timing out executors in dynamic allocation. URL: https://github.com/apache/spark/pull/24704#discussion_r289469335
########## File path: core/src/test/scala/org/apache/spark/scheduler/dynalloc/ExecutorMonitorSuite.scala ########## @@ -0,0 +1,253 @@ +/* + * 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.dynalloc + +import java.util.concurrent.TimeUnit + +import scala.collection.mutable + +import org.mockito.ArgumentMatchers.any +import org.mockito.Mockito.{mock, when} + +import org.apache.spark._ +import org.apache.spark.internal.config._ +import org.apache.spark.scheduler._ +import org.apache.spark.storage._ +import org.apache.spark.util.ManualClock + +class ExecutorMonitorSuite extends SparkFunSuite { + + private val idleTimeoutMs = TimeUnit.SECONDS.toMillis(60L) + private val storageTimeoutMs = TimeUnit.SECONDS.toMillis(120L) + + private val conf = new SparkConf() + .set(DYN_ALLOCATION_EXECUTOR_IDLE_TIMEOUT.key, "60s") + .set(DYN_ALLOCATION_CACHED_EXECUTOR_IDLE_TIMEOUT.key, "120s") + + private var monitor: ExecutorMonitor = _ + private var client: ExecutorAllocationClient = _ + private var clock: ManualClock = _ + + // List of known executors. Allows easily mocking which executors are alive without + // having to use mockito APIs directly in each test. + private val knownExecs = mutable.HashSet[String]() + + override def beforeEach(): Unit = { + super.beforeEach() + knownExecs.clear() + clock = new ManualClock() + client = mock(classOf[ExecutorAllocationClient]) + when(client.isExecutorActive(any())).thenAnswer { invocation => + knownExecs.contains(invocation.getArguments()(0).asInstanceOf[String]) + } + monitor = new ExecutorMonitor(conf, client, clock) + } + + test("basic executor timeout") { + knownExecs += "1" + monitor.onExecutorAdded(SparkListenerExecutorAdded(clock.getTimeMillis(), "1", null)) + assert(monitor.executorCount === 1) + assert(monitor.isExecutorIdle("1")) + assert(monitor.timedOutExecutors(idleDeadline) === Seq("1")) + } + + test("SPARK-4951, SPARK-26927: handle out of order task start events") { + knownExecs ++= Set("1", "2") + + monitor.onTaskStart(SparkListenerTaskStart(1, 1, taskInfo("1", 1))) + assert(monitor.executorCount === 1) + + monitor.onExecutorAdded(SparkListenerExecutorAdded(clock.getTimeMillis(), "1", null)) + assert(monitor.executorCount === 1) + + monitor.onExecutorAdded(SparkListenerExecutorAdded(clock.getTimeMillis(), "2", null)) + assert(monitor.executorCount === 2) + + monitor.onExecutorRemoved(SparkListenerExecutorRemoved(clock.getTimeMillis(), "2", null)) + assert(monitor.executorCount === 1) + + knownExecs -= "2" + + monitor.onTaskStart(SparkListenerTaskStart(1, 1, taskInfo("2", 2))) + assert(monitor.executorCount === 1) + } + + test("track tasks running on executor") { + knownExecs += "1" + + monitor.onExecutorAdded(SparkListenerExecutorAdded(clock.getTimeMillis(), "1", null)) + monitor.onTaskStart(SparkListenerTaskStart(1, 1, taskInfo("1", 1))) + assert(!monitor.isExecutorIdle("1")) + + // Start/end a few tasks and make sure the executor does not go idle. + (2 to 10).foreach { i => + monitor.onTaskStart(SparkListenerTaskStart(i, 1, taskInfo("1", 1))) + assert(!monitor.isExecutorIdle("1")) + + monitor.onTaskEnd(SparkListenerTaskEnd(i, 1, "foo", Success, taskInfo("1", 1), null)) + assert(!monitor.isExecutorIdle("1")) + } + + monitor.onTaskEnd(SparkListenerTaskEnd(1, 1, "foo", Success, taskInfo("1", 1), null)) + assert(monitor.isExecutorIdle("1")) + assert(monitor.timedOutExecutors(clock.getTimeMillis()).isEmpty) + assert(monitor.timedOutExecutors(clock.getTimeMillis() + idleTimeoutMs + 1) === Seq("1")) + } + + test("use appropriate time out depending on whether blocks are stored") { + knownExecs += "1" + monitor.onExecutorAdded(SparkListenerExecutorAdded(clock.getTimeMillis(), "1", null)) + assert(monitor.isExecutorIdle("1")) + assert(monitor.timedOutExecutors(idleDeadline) === Seq("1")) + + monitor.onBlockUpdated(rddUpdate(1, 0, "1")) + assert(monitor.isExecutorIdle("1")) + assert(monitor.timedOutExecutors(idleDeadline).isEmpty) + assert(monitor.timedOutExecutors(storageDeadline) === Seq("1")) + + monitor.onBlockUpdated(rddUpdate(1, 0, "1", level = StorageLevel.NONE)) + assert(monitor.isExecutorIdle("1")) + assert(monitor.timedOutExecutors(idleDeadline) === Seq("1")) + + monitor.onTaskStart(SparkListenerTaskStart(1, 1, taskInfo("1", 1))) + assert(!monitor.isExecutorIdle("1")) + monitor.onBlockUpdated(rddUpdate(1, 0, "1")) + assert(!monitor.isExecutorIdle("1")) + monitor.onBlockUpdated(rddUpdate(1, 0, "1", level = StorageLevel.NONE)) + assert(!monitor.isExecutorIdle("1")) + } + + test("keeps track of stored blocks for each rdd and split") { + monitor.onExecutorAdded(SparkListenerExecutorAdded(clock.getTimeMillis(), "1", null)) + + monitor.onBlockUpdated(rddUpdate(1, 0, "1")) + assert(monitor.timedOutExecutors(idleDeadline).isEmpty) + assert(monitor.timedOutExecutors(storageDeadline) === Seq("1")) + + monitor.onBlockUpdated(rddUpdate(1, 1, "1")) + assert(monitor.timedOutExecutors(idleDeadline).isEmpty) + assert(monitor.timedOutExecutors(storageDeadline) === Seq("1")) + + monitor.onBlockUpdated(rddUpdate(2, 0, "1")) + assert(monitor.timedOutExecutors(idleDeadline).isEmpty) + assert(monitor.timedOutExecutors(storageDeadline) === Seq("1")) + + monitor.onBlockUpdated(rddUpdate(1, 1, "1", level = StorageLevel.NONE)) + assert(monitor.timedOutExecutors(idleDeadline).isEmpty) + assert(monitor.timedOutExecutors(storageDeadline) === Seq("1")) + + monitor.onUnpersistRDD(SparkListenerUnpersistRDD(1)) + assert(monitor.timedOutExecutors(idleDeadline).isEmpty) + assert(monitor.timedOutExecutors(storageDeadline) === Seq("1")) + + monitor.onUnpersistRDD(SparkListenerUnpersistRDD(2)) Review comment: from @dhruve 's comment above, I realized it might be good to add to this test case a bit: ```scala // if we get an unpersist event much later, which moves an executor from having cached blocks // to no longer having cached blocks, we still know the timeout from the original time the // executor went idle clock.setTime(idleDeadline) ... ``` ---------------------------------------------------------------- This is an 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