Github user soenkeliebau commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r228131806
--- Diff:
core/src/main/scala/org/apache/spark/deploy/security/KafkaDelegationTokenProvider.scala
---
@@ -0,0 +1,65 @@
+/*
+ * 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 scala.reflect.runtime.universe
+import scala.util.control.NonFatal
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.security.Credentials
+import org.apache.hadoop.security.token.{Token, TokenIdentifier}
+
+import org.apache.spark.SparkConf
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config.{KAFKA_BOOTSTRAP_SERVERS,
KAFKA_SECURITY_PROTOCOL}
+import org.apache.spark.util.Utils
+
+private[security] class KafkaDelegationTokenProvider
+ extends HadoopDelegationTokenProvider with Logging {
+
+ override def serviceName: String = "kafka"
+
+ override def obtainDelegationTokens(
+ hadoopConf: Configuration,
+ sparkConf: SparkConf,
+ creds: Credentials): Option[Long] = {
+ try {
+ val mirror =
universe.runtimeMirror(Utils.getContextOrSparkClassLoader)
+ val obtainToken = mirror.classLoader.
+ loadClass("org.apache.spark.sql.kafka010.TokenUtil").
+ getMethod("obtainToken", classOf[SparkConf])
+
+ logDebug("Attempting to fetch Kafka security token.")
+ val token = obtainToken.invoke(null, sparkConf)
+ .asInstanceOf[Token[_ <: TokenIdentifier]]
+ creds.addToken(token.getService, token)
+ } catch {
+ case NonFatal(e) =>
+ logInfo(s"Failed to get token from service $serviceName", e)
+ }
+
+ None
+ }
+
+ override def delegationTokensRequired(
+ sparkConf: SparkConf,
+ hadoopConf: Configuration): Boolean = {
+ sparkConf.get(KAFKA_BOOTSTRAP_SERVERS).isDefined &&
+ sparkConf.get(KAFKA_SECURITY_PROTOCOL).startsWith("SASL")
--- End diff --
Was this a conscious decision to not use delegation tokens when using ssl
authentication? That might also be useful to avoid spreading keys all over the
cluster, even if load on the kdc is not an issue in that case.
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