Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22598#discussion_r231252803
--- 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
+ *
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+ */
+
+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
--- End diff --
> Just moves the reflection into HadoopDelegationTokenManager
You can't escape reflection unless you use `java.util.ServiceLoader` here,
and it was decided not to use that when this code was first written. My
argument is that it is a lot less reflection - it's just `Class.forName`
instead of this whole class here.
> Has to be copied when delegation token will be introduced in DStreams
And how is that different from what you have here? The code you have won't
work for dstreams since it's not even available when you pull in just the
dstream connector.
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