Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/14065#discussion_r69989547 --- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/token/ConfigurableTokenManager.scala --- @@ -0,0 +1,214 @@ +/* + * 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.token + +import scala.collection.mutable +import scala.util.control.NonFatal + +import org.apache.hadoop.conf.Configuration +import org.apache.hadoop.security.Credentials +import org.apache.hadoop.security.token.Token + +import org.apache.spark.{SparkConf, SparkException} +import org.apache.spark.internal.Logging +import org.apache.spark.util.Utils + +/** + * A [[ConfigurableTokenManager]] to manage all the token providers register in this class. Also + * it provides other modules the functionality to obtain tokens, get token renewal interval and + * calculate the time length till next renewal. + * + * By default ConfigurableTokenManager has 3 built-in token providers, HDFSTokenProvider, + * HiveTokenProvider and HBaseTokenProvider, and this 3 token providers can also be controlled + * by configuration spark.yarn.security.tokens.{service}.enabled, if it is set to false, this + * provider will not be loaded. + * + * For other token providers which need to be loaded in should: + * 1. Implement [[ServiceTokenProvider]] or [[ServiceTokenRenewable]] if token renewal is + * required for this service. + * 2. set spark.yarn.security.tokens.{service}.enabled to true + * 3. Specify the class name through spark.yarn.security.tokens.{service}.class + * + */ +final class ConfigurableTokenManager private[yarn] (sparkConf: SparkConf) extends Logging { + private val tokenProviderEnabledConfig = "spark\\.yarn\\.security\\.tokens\\.(.+)\\.enabled".r + private val tokenProviderClsConfig = "spark.yarn.security.tokens.%s.class" + + // Maintain all the registered token providers + private val tokenProviders = mutable.HashMap[String, ServiceTokenProvider]() + + private val defaultTokenProviders = Map( + "hdfs" -> "org.apache.spark.deploy.yarn.token.HDFSTokenProvider", + "hive" -> "org.apache.spark.deploy.yarn.token.HiveTokenProvider", + "hbase" -> "org.apache.spark.deploy.yarn.token.HBaseTokenProvider" + ) + + // AMDelegationTokenRenewer, this will only be create and started in the AM + private var _delegationTokenRenewer: AMDelegationTokenRenewer = null + + // ExecutorDelegationTokenUpdater, this will only be created and started in the driver and + // executor side. + private var _delegationTokenUpdater: ExecutorDelegationTokenUpdater = null + + def initialize(): Unit = { --- End diff -- A lot of this method would go away by using `java.util.ServiceLoader`.
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