Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21068#discussion_r185109185
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/FailureTracker.scala
---
@@ -0,0 +1,85 @@
+/*
+ * 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.deploy.yarn
+
+import scala.collection.mutable
+
+import org.apache.spark.SparkConf
+import org.apache.spark.internal.Logging
+import org.apache.spark.util.{Clock, SystemClock}
+
+/**
+ * FailureTracker is responsible for tracking executor failures both for
each host separately
+ * and for all host altogether.
+*/
+private[spark] class FailureTracker(
+ sparkConf: SparkConf,
+ var clock: Clock = new SystemClock) extends Logging {
+
+ private val executorFailuresValidityInterval =
+
sparkConf.get(config.EXECUTOR_ATTEMPT_FAILURE_VALIDITY_INTERVAL_MS).getOrElse(-1L)
+
+ // Queue to store the timestamp of failed executors for each host
+ private val failedExecutorsTimeStampsPerHost = mutable.Map[String,
mutable.Queue[Long]]()
+
+ private val failedExecutorsTimeStamps = new mutable.Queue[Long]()
+
+ private def recentFailureCount(failedExecutorsTimeStampsForHost:
mutable.Queue[Long]): Int = {
+ val endTime = clock.getTimeMillis()
+ while (executorFailuresValidityInterval > 0 &&
+ failedExecutorsTimeStampsForHost.nonEmpty &&
+ failedExecutorsTimeStampsForHost.head < endTime -
executorFailuresValidityInterval) {
+ failedExecutorsTimeStampsForHost.dequeue()
+ }
+ failedExecutorsTimeStampsForHost.size
+ }
+
+ /**
+ * Use a different clock. This is mainly used for testing.
+ */
+ def setClock(newClock: Clock): Unit = {
+ clock = newClock
+ }
+
+ def numExecutorsFailed: Int = synchronized {
--- End diff --
`numFailedExecutors`
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