Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14065#discussion_r69989897
--- 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 = {
+ // Copy SparkConf and add default enabled token provider
configurations to SparkConf.
+ val clonedConf = sparkConf.clone
+ defaultTokenProviders.keys.foreach { key =>
+ clonedConf.setIfMissing(s"spark.yarn.security.tokens.$key.enabled",
"true")
+ }
+
+ // Instantialize all the service token providers according to the
configurations.
+ clonedConf.getAll.filter { case (key, value) =>
+ if (tokenProviderEnabledConfig.findPrefixOf(key).isDefined) {
+ value.toBoolean
+ } else {
+ false
+ }
+ }.map { case (key, _) =>
+ val tokenProviderEnabledConfig(service) = key
+ val cls = sparkConf.getOption(tokenProviderClsConfig.format(service))
+ .orElse(defaultTokenProviders.get(service))
+ (service, cls)
+ }.foreach { case (service, cls) =>
+ if (cls.isDefined) {
+ try {
+ val tokenProvider =
+
Utils.classForName(cls.get).newInstance().asInstanceOf[ServiceTokenProvider]
+ tokenProviders += (service -> tokenProvider)
+ } catch {
+ case NonFatal(e) =>
+ logWarning(s"Fail to instantiate class ${cls.get}", e)
+ }
+ }
+ }
+ }
+
+ /**
+ * Get service token provider by name.
+ */
+ def getServiceTokenProvider(service: String):
Option[ServiceTokenProvider] = {
+ tokenProviders.get(service)
+ }
+
+ /**
+ * Obtain tokens from all the token providers and add into credentials,
also return as an array.
+ */
+ def obtainTokens(conf: Configuration, creds: Credentials):
Array[Token[_]] = {
+ val tokenBuf = mutable.ArrayBuffer[Token[_]]()
+ tokenProviders.values.foreach { provider =>
--- End diff --
minor: you can use `flatMap` instead of a mutable buffer.
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