Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/21068#discussion_r195467887
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocatorBlacklistTracker.scala
---
@@ -0,0 +1,189 @@
+/*
+ * 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.JavaConverters._
+import scala.collection.mutable
+import scala.collection.mutable.HashMap
+
+import org.apache.hadoop.yarn.client.api.AMRMClient
+import org.apache.hadoop.yarn.client.api.AMRMClient.ContainerRequest
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.yarn.config._
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config._
+import org.apache.spark.util.{Clock, SystemClock, Utils}
+
+/**
+ * YarnAllocatorBlacklistTracker is responsible for tracking the
blacklisted nodes
+ * and synchronizing the node list to YARN.
+ *
+ * Blacklisted nodes are coming from two different sources:
+ *
+ * <ul>
+ * <li> from the scheduler as task level blacklisted nodes
+ * <li> from this class (tracked here) as YARN resource allocation
problems
+ * </ul>
+ *
+ * The reason to realize this logic here (and not in the driver) is to
avoid possible delays
+ * between synchronizing the blacklisted nodes with YARN and resource
allocations.
+ */
+private[spark] class YarnAllocatorBlacklistTracker(
+ sparkConf: SparkConf,
+ amClient: AMRMClient[ContainerRequest],
+ failureTracker: FailureTracker)
+ extends Logging {
+
+ private val defaultTimeout = "1h"
+
+ private val blacklistTimeoutMillis =
--- End diff --
`BlacklistTracker.getBlacklistTimeout(conf)`
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