Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/22911#discussion_r233578429 --- Diff: resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DelegationTokenFeatureStep.scala --- @@ -0,0 +1,114 @@ +/* + * 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.features + +import io.fabric8.kubernetes.api.model.{ContainerBuilder, HasMetadata, PodBuilder, SecretBuilder} +import org.apache.commons.codec.binary.Base64 +import org.apache.hadoop.security.UserGroupInformation + +import org.apache.spark.deploy.SparkHadoopUtil +import org.apache.spark.deploy.k8s.{KubernetesConf, KubernetesUtils, SparkPod} +import org.apache.spark.deploy.k8s.Config._ +import org.apache.spark.deploy.k8s.Constants._ +import org.apache.spark.deploy.security.HadoopDelegationTokenManager +import org.apache.spark.internal.config._ + +/** + * Delegation token support for Spark apps on kubernetes. + * + * When preparing driver resources, this step will generate delegation tokens for the app if + * they're needed. + * + * When preparing pods, this step will mount the delegation token secret (either pre-defined, + * or generated by this step when preparing the driver). + */ +private[spark] class DelegationTokenFeatureStep(conf: KubernetesConf[_], isDriver: Boolean) --- End diff -- During the recent discussion in the sig meeting I was thinking about this guy. I think it may not be necessary to mount this secret in executors, and let the driver propagate the tokens to executors through its normal means. e.g. later if/when adding code to monitor delegation tokens for updates, that would mean only the driver has to do it. I'll git this a try; if it works, it might be feasible to re-merge this code with the kerberos step.
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