Github user ArtRand commented on a diff in the pull request:
https://github.com/apache/spark/pull/19272#discussion_r145298313
--- Diff:
resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCredentialRenewer.scala
---
@@ -0,0 +1,154 @@
+/*
+ * 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.cluster.mesos
+
+import java.security.PrivilegedExceptionAction
+import java.util.concurrent.{Executors, TimeUnit}
+
+import scala.collection.JavaConverters._
+import scala.util.Try
+
+import org.apache.hadoop.security.UserGroupInformation
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.deploy.security.HadoopDelegationTokenManager
+import org.apache.spark.internal.Logging
+import org.apache.spark.rpc.RpcEndpointRef
+import
org.apache.spark.scheduler.cluster.CoarseGrainedClusterMessages.UpdateDelegationTokens
+import org.apache.spark.util.ThreadUtils
+
+
+class MesosCredentialRenewer(
+ conf: SparkConf,
+ tokenManager: HadoopDelegationTokenManager,
+ nextRenewal: Long,
+ de: RpcEndpointRef) extends Logging {
--- End diff --
fixed.
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