Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r233627534
--- Diff:
core/src/main/scala/org/apache/spark/deploy/security/KafkaDelegationTokenProvider.scala
---
@@ -0,0 +1,57 @@
+/*
+ * 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.language.existentials
+import scala.util.control.NonFatal
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.security.Credentials
+
+import org.apache.spark.SparkConf
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config.{KAFKA_BOOTSTRAP_SERVERS,
KAFKA_SECURITY_PROTOCOL}
+
+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 {
+ logDebug("Attempting to fetch Kafka security token.")
+ val (token, nextRenewalDate) = KafkaTokenUtil.obtainToken(sparkConf)
+ creds.addToken(token.getService, token)
+ return Some(nextRenewalDate)
+ } 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 &&
--- End diff --
`sparkConf.contains(KAFKA_BOOTSTRAP_SERVERS)`
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