Github user mwws commented on a diff in the pull request:
https://github.com/apache/spark/pull/8760#discussion_r40164712
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/BlacklistStrategy.scala ---
@@ -0,0 +1,156 @@
+/*
+ * 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 scala.collection.mutable
+
+import org.apache.spark.Logging
+import org.apache.spark.SparkConf
+import org.apache.spark.util.SystemClock
+
+/**
+ * The interface to determine executor blacklist and node blacklist.
+ */
+trait BlacklistStrategy {
+ val expireTimeInMillisecond: Long
+
+ // TaskId is optional here because the BlacklistStrategy could be
unrelated to TaskId
+ def getExecutorBlacklist(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus],
+ taskId: Option[Long]): Set[String]
+
+ def getNodeBlacklist(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus],
+ taskId: Option[Long]): Set[String]
+
+ // Default implementation to remove failure executors from HashMap based
on given time period.
+ def expireExecutorsInBlackList(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus]): Unit = {
+ val now = new SystemClock().getTimeMillis()
+ failedExecutorMap.retain((executorid, failureStatus) => {
+ (now - failureStatus.updatedTime) < expireTimeInMillisecond
+ })
+ }
+}
+
+/**
+ * The interface for taskId unrelated strategy. In this case, provided
taskId will be ignored. The
+ * benefit for taskId unrelated strategy is different taskSets can learn
experience from other
+ * taskSet to avoid allocating tasks to problematic executors.
+ */
+trait TaskUnrelatedBlacklistStrategy extends BlacklistStrategy with
Logging{
+ def getExecutorBlacklist(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus],
+ taskId: Option[Long]): Set[String] = {
+ if (taskId.isDefined){
+ logWarning("TaskId unrelated strategy is applied, given taskId will
be ignored")
+ }
+ getExecutorBlacklist(failedExecutorMap)
+ }
+
+ def getNodeBlacklist(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus],
+ taskId: Option[Long]): Set[String] = {
+ if (taskId.isDefined){
+ logWarning("TaskId unrelated strategy is applied, given taskId will
be ignored")
+ }
+ getNodeBlacklist(failedExecutorMap)
+ }
+
+ // define new interface which remove taskId from parameter.
+ def getExecutorBlacklist(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus]):
Set[String]
+ def getNodeBlacklist(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus]):
Set[String]
+}
+
+/**
+ * This strategy is simply based on given threshold and is taskId
unrelated. An executor will be
+ * in blacklist, if it failed more than "maxFailureTaskNumber" times. A
node will be in blacklist,
+ * if there are more than "maxBlackExecutorNumber" executors on it in
executor blacklist.
+ */
+class SimpleStrategy(
+ maxFailureTaskNumber: Int,
+ maxBlackExecutorNumber: Int,
+ val expireTimeInMillisecond: Long
+ )extends TaskUnrelatedBlacklistStrategy {
+
+ private def getSelectedExecutorMap(
+ failedExecutorMap: mutable.HashMap[String, FailureStatus]) = {
+ failedExecutorMap.filter{
+ case (id, failureStatus) => failureStatus.failureTimes >
maxFailureTaskNumber
+ }
+ }
+
+ def getExecutorBlacklist(
+ failureExecutors: mutable.HashMap[String, FailureStatus]):
Set[String] = {
+ getSelectedExecutorMap(failureExecutors).keys.toSet
+ }
+
+ def getNodeBlacklist(
+ failureExecutors: mutable.HashMap[String, FailureStatus]):
Set[String] = {
+ getSelectedExecutorMap(failureExecutors)
+ .groupBy{case (id, failureStatus) => failureStatus.host}
+ .filter {case (host, failureExecutors) => failureExecutors.size >
maxBlackExecutorNumber}
+ .keys.toSet
+ }
+}
+
+/**
+ * This strategy is applied as default to keep the same semantics as
original.
--- End diff --
Sure, I will enhance the comment
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