vanzin commented on a change in pull request #25631: [SPARK-28928][SS] Take 
over Kafka delegation token protocol on sources/sinks
URL: https://github.com/apache/spark/pull/25631#discussion_r320987442
 
 

 ##########
 File path: docs/structured-streaming-kafka-integration.md
 ##########
 @@ -770,7 +770,9 @@ Delegation tokens can be obtained from multiple clusters 
and <code>${cluster}</c
     <td><code>spark.kafka.clusters.${cluster}.security.protocol</code></td>
     <td>SASL_SSL</td>
     <td>
-      Protocol used to communicate with brokers. For further details please 
see Kafka documentation. Only used to obtain delegation token.
+      Protocol used to communicate with brokers. For further details please 
see Kafka documentation. Protocol is applied on all the sources and sinks as 
default where
+      <code>bootstrap.servers</code> config matches (for further details 
please see 
<code>spark.kafka.clusters.${cluster}.target.bootstrap.servers.regex</code>)
+      which can be overwritten with <code>kafka.security.protocol</code> 
config on a source or sink.
 
 Review comment:
   ```suggestion
         , and can be overridden by setting 
<code>kafka.security.protocol</code> on the source or sink.
   ```

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