Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/17723#discussion_r114035613
--- Diff:
core/src/main/scala/org/apache/spark/deploy/security/ConfigurableCredentialManager.scala
---
@@ -0,0 +1,133 @@
+/*
+ * 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.ServiceLoader
+
+import scala.collection.JavaConverters._
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.security.{Credentials, UserGroupInformation}
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.internal.Logging
+import org.apache.spark.util.Utils
+
+/**
+ * A ConfigurableCredentialManager to manage all the registered credential
providers and offer
+ * APIs for other modules to obtain credentials as well as renewal time.
By default
+ * [[HadoopFSCredentialProvider]], [[HiveCredentialProvider]] and
[[HBaseCredentialProvider]] will
+ * be loaded in if not explicitly disabled, any plugged-in credential
provider wants to be
+ * managed by ConfigurableCredentialManager needs to implement
[[ServiceCredentialProvider]]
+ * interface and put into resources/META-INF/services to be loaded by
ServiceLoader.
+ *
+ * Also each credential provider is controlled by
+ * spark.security.credentials.{service}.enabled, it will not be loaded in
if set to false.
+ * For example, Hive's credential provider [[HiveCredentialProvider]] can
be enabled/disabled by
+ * the configuration spark.security.credentials.hive.enabled.
+ */
+private[spark] class ConfigurableCredentialManager(
+ sparkConf: SparkConf,
+ hadoopConf: Configuration,
+ hadoopAccessManager: HadoopAccessManager)
+ extends Logging {
+
+ private val deprecatedProviderEnabledConfigs = List(
+ "spark.yarn.security.tokens.%s.enabled",
+ "spark.yarn.security.credentials.%s.enabled")
+ private val providerEnabledConfig =
"spark.security.credentials.%s.enabled"
+
+ // Maintain all the registered credential providers
+ private val credentialProviders = getCredentialProviders
+ logDebug(s"Using the following credential providers:
${credentialProviders.keys.mkString(", ")}.")
+
+ def this(sparkConf: SparkConf, hadoopConf: Configuration) {
+ this(sparkConf, hadoopConf, new DefaultHadoopAccessManager(hadoopConf))
+ }
+
+ def this(sparkConf: SparkConf) {
+ this(sparkConf, SparkHadoopUtil.get.newConfiguration(sparkConf))
+ }
+
+ private def getCredentialProviders(): Map[String,
ServiceCredentialProvider] = {
+ val providers = loadCredentialProviders
+
+ // Filter out credentials in which
spark.security.credentials.{service}.enabled is false.
+ providers
+ .filter(p => isServiceEnabled(p.serviceName))
+ .map(p => (p.serviceName, p))
+ .toMap
+ }
+
+ protected def isServiceEnabled(serviceName: String): Boolean = {
+ val key = providerEnabledConfig.format(serviceName)
+
+ deprecatedProviderEnabledConfigs.foreach { pattern =>
+ val deprecatedKey = pattern.format(serviceName)
+ if (sparkConf.contains(deprecatedKey)) {
+ logWarning(s"${deprecatedKey} is deprecated, using ${key} instead")
+ }
+ }
+
+ val isEnabledDeprecated = deprecatedProviderEnabledConfigs.forall {
pattern =>
+ sparkConf
+ .getOption(pattern.format(serviceName))
+ .map(_.toBoolean)
+ .getOrElse(true)
+ }
+
+ sparkConf
+ .getOption(key)
+ .map(_.toBoolean)
+ .getOrElse(isEnabledDeprecated)
+ }
+
+ private def loadCredentialProviders: List[ServiceCredentialProvider] = {
+ ServiceLoader.load(classOf[ServiceCredentialProvider],
Utils.getContextOrSparkClassLoader)
+ .asScala.toList
+ }
+
+ /**
+ * Get credential provider for the specified service.
+ */
+ def getServiceCredentialProvider(service: String):
Option[ServiceCredentialProvider] = {
+ credentialProviders.get(service)
+ }
+
+ /**
+ * Writes delegation tokens to creds. Delegation tokens are fetched
from all registered
+ * providers.
+ *
+ * @return nearest time of next renewal, Long.MaxValue if all the
credentials aren't renewable,
--- End diff --
Sentence is a little redundant.
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