Github user liyinan926 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21669#discussion_r221677518
--- Diff:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/security/KubernetesHadoopDelegationTokenManager.scala
---
@@ -0,0 +1,77 @@
+/*
+ * 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.k8s.security
+
+import java.io.File
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.FileSystem
+import org.apache.hadoop.security.{Credentials, 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.util.{Clock, SystemClock}
+
+ /**
+ * The KubernetesHadoopDelegationTokenManager fetches Hadoop delegation
tokens
+ * on the behalf of the Kubernetes submission client. The new credentials
+ * (called Tokens when they are serialized) are stored in Secrets
accessible
+ * to the driver and executors, when new Tokens are received they
overwrite the current Secrets.
+ */
+private[spark] class KubernetesHadoopDelegationTokenManager extends
Logging {
--- End diff --
Why do you need this class if the only thing it does is to use a
`HadoopDelegationTokenManager` to get a DT? Looks like you can use
`HadoopDelegationTokenManager` directly?
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