Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/8760#discussion_r45755594
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/BlacklistTracker.scala ---
@@ -0,0 +1,247 @@
+/*
+ * 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 java.util.concurrent.TimeUnit
+import scala.collection.mutable
+import org.apache.spark.SparkConf
+import org.apache.spark.Success
+import org.apache.spark.TaskEndReason
+import org.apache.spark.annotation.DeveloperApi
+import org.apache.spark.util.SystemClock
+import org.apache.spark.util.ThreadUtils
+import org.apache.spark.util.Utils
+import org.apache.spark.util.Clock
+
+import com.google.common.annotations.VisibleForTesting
+
+/**
+ * BlacklistTracker is design to track problematic executors and node on
application level.
+ * It is shared by all TaskSet, so that once a new TaskSet coming, it
could be benefit from
+ * previous experience of other TaskSet.
+ *
+ * Once task finished, the callback method in TaskSetManager should update
+ * executorIdToFailureStatus Map.
+ */
+private[spark] class BlacklistTracker(
+ sparkConf: SparkConf,
+ clock: Clock = new SystemClock()) extends BlacklistCache{
+ // maintain a ExecutorId --> FailureStatus HashMap
+ private val executorIdToFailureStatus: mutable.HashMap[String,
FailureStatus] = mutable.HashMap()
+
+ // Apply Strategy pattern here to change different blacklist detection
logic
+ private val strategy = BlacklistStrategy(sparkConf)
+
+ // A daemon thread to expire blacklist executor periodically
+ private val scheduler =
ThreadUtils.newDaemonSingleThreadScheduledExecutor(
+ "spark-scheduler-blacklist-expire-timer")
+
+ private val recoverPeriod = sparkConf.getTimeAsSeconds(
+ "spark.scheduler.blacklist.recoverPeriod", "60s")
+
+ def start(): Unit = {
+ val scheduleTask = new Runnable() {
+ override def run(): Unit = {
+ Utils.logUncaughtExceptions(expireExecutorsInBlackList())
+ }
+ }
+ scheduler.scheduleAtFixedRate(scheduleTask, 0L, recoverPeriod,
TimeUnit.SECONDS)
+ }
+
+ def stop(): Unit = {
+ scheduler.shutdown()
+ scheduler.awaitTermination(10, TimeUnit.SECONDS)
+ }
+
+ // The actual implementation is delegated to strategy
+ /** VisibleForTesting */
+ private[scheduler] def expireExecutorsInBlackList(): Unit = synchronized
{
+ val updated =
strategy.expireExecutorsInBlackList(executorIdToFailureStatus, clock)
+ if (updated) {
+ invalidAllCache()
+ }
+ }
+
+ def updateFailureExecutors(
+ stageId: Int, info: TaskInfo, reason: TaskEndReason) : Unit =
synchronized {
+ val index = info.index
+ val atomTask = BlacklistAtomTask(stageId, index)
+ reason match {
+ // If task succeeding, remove related record from
executorIdToFailureStatus
+ case Success =>
+ removeFailureExecutorsForTaskId(info.executorId, stageId, index)
+
+ // If task failing, update latest failure time and failedTaskIds
+ case _ =>
+ val executorId = info.executorId
+ executorIdToFailureStatus.get(executorId) match {
+ case Some(failureStatus) =>
+ failureStatus.updatedTime = clock.getTimeMillis()
+ val failedTimes =
failureStatus.numFailuresPerTask.getOrElse(atomTask, 0) + 1
+ failureStatus.numFailuresPerTask.update(atomTask, failedTimes)
+ case None =>
+ val failedTasks = mutable.HashMap(atomTask -> 1)
+ val failureStatus = new FailureStatus(
+ clock.getTimeMillis(), info.host, failedTasks)
+ executorIdToFailureStatus.update(executorId, failureStatus)
+ }
+ invalidAllCache()
+ }
+ }
+
+ /** remove the executorId from executorIdToFailureStatus */
+ def removeFailureExecutors(executorId: String) : Unit = synchronized {
+ executorIdToFailureStatus.remove(executorId)
+ invalidAllCache()
+ }
+
+ /**
+ * remove the failure record related to given taskId from
executorIdToFailureStatus. If the
+ * number of records of given executorId becomes 0, remove the completed
executorId.
+ */
+ def removeFailureExecutorsForTaskId(
+ executorId: String,
+ stageId: Int,
+ taskIndex: Int) : Unit = synchronized {
+ val atomTask = BlacklistAtomTask(stageId, taskIndex)
+ executorIdToFailureStatus.get(executorId).map(fs => {
+ fs.numFailuresPerTask.remove(atomTask)
+ if(fs.numFailuresPerTask.isEmpty){
+ executorIdToFailureStatus.remove(executorId)
+ }
+ invalidAllCache()
+ })
+ }
+
+ def executorIsBlacklisted(
+ executorId: String,
+ sched: TaskSchedulerImpl,
+ stageId: Int,
+ taskIndex: Int) : Boolean = {
+
+ executorBlacklist(sched, stageId, taskIndex).contains(executorId)
+ }
+
+ // If the node is in blacklist, all executors allocated on that node will
+ // also be put into executor blacklist.
+ private def executorsOnBlacklistedNode(
+ sched: TaskSchedulerImpl): Set[String] = {
+ nodeBlacklist().flatMap(sched.getExecutorsAliveOnHost(_)
+ .getOrElse(Set.empty[String])).toSet
+ }
+
+ def executorBlacklist(
+ sched: TaskSchedulerImpl, stageId: Int, taskIndex: Int): Set[String]
= synchronized {
+ val atomTask = BlacklistAtomTask(stageId, taskIndex)
+ if (!isBlacklistExecutorCacheValid) {
+ reEvaluateExecutorBlacklistAndUpdateCache(sched, atomTask, clock)
+ } else {
+ getExecutorBlacklistFromCache(atomTask).getOrElse {
+ reEvaluateExecutorBlacklistAndUpdateCache(sched, atomTask, clock)
+ }
+ }
+ }
+
+ private def reEvaluateExecutorBlacklistAndUpdateCache(
+ sched: TaskSchedulerImpl,
+ atomTask: BlacklistAtomTask,
+ clock: Clock): Set[String] = {
+ val executors = executorsOnBlacklistedNode(sched) ++
+ strategy.getExecutorBlacklist(executorIdToFailureStatus, atomTask,
clock)
+ updateBlacklistExecutorCache(atomTask, executors)
+ executors
+ }
+
+ // The actual implementation is delegated to strategy
+ def nodeBlacklist(): Set[String] = synchronized {
+ if (isBlacklistNodeCacheValid) {
+ getNodeBlacklistFromCache
+ } else {
+ val nodes = strategy.getNodeBlacklist(executorIdToFailureStatus)
+ updateBlacklistNodeCache(nodes)
+ nodes
+ }
+ }
+}
+
+/**
+ * Hide cache details in this trait to make code clean and avoid operation
mistake
+ */
+private[scheduler] trait BlacklistCache {
+
+ // local cache to minimize the the work when query blacklisted executor
and node
+ private val blacklistExecutorCache =
mutable.HashMap.empty[BlacklistAtomTask, Set[String]]
+ private val blacklistNodeCache = mutable.Set.empty[String]
+
+ // The flag to mark if cache is valid, it will be set to false when
executorIdToFailureStatus be
+ // updated and it will be set to true, when called executorBlacklist and
nodeBlacklist.
+ private var _isBlacklistExecutorCacheValid : Boolean = false
+ private var _isBlacklistNodeCacheValid: Boolean = false
+
+ private val cacheLock = new Object()
+
+ protected def isBlacklistExecutorCacheValid : Boolean =
_isBlacklistExecutorCacheValid
+ protected def isBlacklistNodeCacheValid: Boolean =
_isBlacklistNodeCacheValid
+
+ protected def updateBlacklistExecutorCache(
+ atomTask: BlacklistAtomTask,
+ blacklistExecutor: Set[String]): Unit = cacheLock.synchronized {
+ if (!_isBlacklistExecutorCacheValid) {
+ blacklistExecutorCache.clear()
+ }
+ blacklistExecutorCache.update(atomTask, blacklistExecutor)
+ _isBlacklistExecutorCacheValid = true
+ }
+
+ protected def updateBlacklistNodeCache(
+ blacklistNode: Set[String]): Unit = cacheLock.synchronized {
+ if (!_isBlacklistNodeCacheValid) {
+ blacklistNodeCache.clear()
+ }
+ blacklistNodeCache ++= blacklistNode
+ _isBlacklistNodeCacheValid = true
+ }
+
+ protected def invalidAllCache(): Unit = cacheLock.synchronized {
+ _isBlacklistExecutorCacheValid = false
+ _isBlacklistNodeCacheValid = false
+ }
+
+ protected def getExecutorBlacklistFromCache(
+ atomTask: BlacklistAtomTask): Option[Set[String]] =
blacklistExecutorCache.get(atomTask)
+
+ protected def getNodeBlacklistFromCache: Set[String] =
blacklistNodeCache.toSet
+}
+/**
+ * A class to record details of failure.
+ *
+ * @param initialTime the time when failure status be created
+ * @param host the node name which running executor on
+ * @param numFailuresPerTask all tasks failed on the executor (key is
BlacklistAtomTask, value
+ * is the number of failures of this task)
+ */
+final class FailureStatus(
--- End diff --
`private[scheduler]`
---
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 [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
