AppStatusStoreSuite.scala

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 * 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
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package org.apache.spark.status

import org.apache.spark.{SparkConf, SparkFunSuite}
import org.apache.spark.util.Distribution
import org.apache.spark.util.kvstore._

class AppStatusStoreSuite extends SparkFunSuite {

  private val uiQuantiles = Array(0.0, 0.25, 0.5, 0.75, 1.0)
  private val stageId = 1
  private val attemptId = 1

  test("quantile calculation: 1 task") {
    compareQuantiles(1, uiQuantiles)
  }

  test("quantile calculation: few tasks") {
    compareQuantiles(4, uiQuantiles)
  }

  test("quantile calculation: more tasks") {
    compareQuantiles(100, uiQuantiles)
  }

  test("quantile calculation: lots of tasks") {
    compareQuantiles(4096, uiQuantiles)
  }

  test("quantile calculation: custom quantiles") {
    compareQuantiles(4096, Array(0.01, 0.33, 0.5, 0.42, 0.69, 0.99))
  }

  test("quantile cache") {
    val store = new InMemoryStore()
    (0 until 4096).foreach { i => store.write(newTaskData(i)) }

    val appStore = new AppStatusStore(store)

    appStore.taskSummary(stageId, attemptId, Array(0.13d))
    intercept[NoSuchElementException] {
      store.read(classOf[CachedQuantile], Array(stageId, attemptId, "13"))
    }

    appStore.taskSummary(stageId, attemptId, Array(0.25d))
    val d1 = store.read(classOf[CachedQuantile], Array(stageId, attemptId, "25"))

    // Add a new task to force the cached quantile to be evicted, and make sure it's updated.
    store.write(newTaskData(4096))
    appStore.taskSummary(stageId, attemptId, Array(0.25d, 0.50d, 0.73d))

    val d2 = store.read(classOf[CachedQuantile], Array(stageId, attemptId, "25"))
    assert(d1.taskCount != d2.taskCount)

    store.read(classOf[CachedQuantile], Array(stageId, attemptId, "50"))
    intercept[NoSuchElementException] {
      store.read(classOf[CachedQuantile], Array(stageId, attemptId, "73"))
    }

    assert(store.count(classOf[CachedQuantile]) === 2)
  }

  private def createLiveStore(inMemoryStore: InMemoryStore): AppStatusStore = {
    val conf = new SparkConf()
    val store = new ElementTrackingStore(inMemoryStore, conf)
    val listener = new AppStatusListener(store, conf, true, None)
    new AppStatusStore(store, listener = Some(listener))
  }

  test("SPARK-28638: only successful tasks have taskSummary when with in memory kvstore") {
    val store = new InMemoryStore()
    (0 until 5).foreach { i => store.write(newTaskData(i, status = "FAILED")) }
    Seq(new AppStatusStore(store), createLiveStore(store)).foreach { appStore =>
      val summary = appStore.taskSummary(stageId, attemptId, uiQuantiles)
      assert(summary.size === 0)
    }
  }

  test("SPARK-28638: summary should contain successful tasks only when with in memory kvstore") {
    val store = new InMemoryStore()

    for (i <- 0 to 5) {
      if (i % 2 == 1) {
        store.write(newTaskData(i, status = "FAILED"))
      } else {
        store.write(newTaskData(i))
      }
    }

    Seq(new AppStatusStore(store), createLiveStore(store)).foreach { appStore =>
      val summary = appStore.taskSummary(stageId, attemptId, uiQuantiles).get

      val values = Array(0.0, 2.0, 4.0)

      val dist = new Distribution(values, 0, values.length).getQuantiles(uiQuantiles.sorted)
      dist.zip(summary.executorRunTime).foreach { case (expected, actual) =>
        assert(expected === actual)
      }
    }
  }

  private def compareQuantiles(count: Int, quantiles: Array[Double]): Unit = {
    val store = new InMemoryStore()
    val values = (0 until count).map { i =>
      val task = newTaskData(i)
      store.write(task)
      i.toDouble
    }.toArray

    val summary = new AppStatusStore(store).taskSummary(stageId, attemptId, quantiles).get
    val dist = new Distribution(values, 0, values.length).getQuantiles(quantiles.sorted)

    dist.zip(summary.executorRunTime).foreach { case (expected, actual) =>
      assert(expected === actual)
    }
  }

  private def newTaskData(i: Int, status: String = "SUCCESS"): TaskDataWrapper = {
    new TaskDataWrapper(
      i, i, i, i, i, i, i.toString, i.toString, status, i.toString, false, Nil, None,
      i, i, i, i, i, i, i, i, i, i,
      i, i, i, i, i, i, i, i, i, i,
      i, i, i, i, stageId, attemptId)
  }
}