Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19272#discussion_r148337519
--- Diff:
core/src/main/scala/org/apache/spark/deploy/security/HadoopCredentialRenewer.scala
---
@@ -0,0 +1,57 @@
+/*
+ * 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.security
+
+import java.util.concurrent.{ScheduledExecutorService, TimeUnit}
+
+import org.apache.spark.internal.Logging
+
+/**
+ * Abstract class for credential renewers used my YARN and Mesos. To renew
delegation tokens
+ * the scheduler backend calls [[scheduleTokenRenewal]]. The
implementation of this method
+ * (and the dispersal of tokens) is resource-manager-specific, see
implementations of this
+ * class for details.
+ */
+abstract class HadoopCredentialRenewer extends Logging {
--- End diff --
`private[spark]`
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