vanzin commented on a change in pull request #24305: [SPARK-27294][SS] Add 
multi-cluster Kafka delegation token
URL: https://github.com/apache/spark/pull/24305#discussion_r281777290
 
 

 ##########
 File path: 
external/kafka-0-10-token-provider/src/main/scala/org/apache/spark/kafka010/KafkaTokenUtil.scala
 ##########
 @@ -223,14 +236,27 @@ private[spark] object KafkaTokenUtil extends Logging {
     }
   }
 
-  def isTokenAvailable(): Boolean = {
-    UserGroupInformation.getCurrentUser().getCredentials.getToken(
-      KafkaTokenUtil.TOKEN_SERVICE) != null
+  def findMatchingToken(
+      sparkConf: SparkConf,
+      bootStrapServers: String): Option[KafkaTokenClusterConf] = {
+    val tokens = 
UserGroupInformation.getCurrentUser().getCredentials.getAllTokens.asScala
+    val clusterConfigs = tokens
+      .filter(_.getService().toString().startsWith(TOKEN_SERVICE_PREFIX))
+      .map { token =>
+        KafkaTokenSparkConf.getClusterConfig(sparkConf, 
getClusterIdentifier(token.getService()))
+      }
+      .filter { clusterConfig =>
+        val pattern = Pattern.compile(clusterConfig.targetServersRegex)
+        
Utils.stringToSeq(bootStrapServers).exists(pattern.matcher(_).matches())
 
 Review comment:
   Sounded like a pretty easy thing to implement, but anyway, not worth 
spending too much time on.

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