vanzin commented on a change in pull request #27146:
[SPARK-21869][SS][DOCS][FOLLOWUP] Document Kafka producer pool configuration
URL: https://github.com/apache/spark/pull/27146#discussion_r365359509
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File path: docs/structured-streaming-kafka-integration.md
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@@ -802,6 +802,31 @@ df.selectExpr("topic", "CAST(key AS STRING)", "CAST(value
AS STRING)") \
</div>
</div>
+### Producer Caching
+
+Given Kafka producer instance is designed to be thread-safe, Spark initializes
a Kafka producer instance and co-use across tasks for same caching key.
+
+The caching key is built up from the following information:
Review comment:
I think this would be more useful if you want to explain how a user can
force separate producers to be used. Otherwise it's an internal detail that
doesn't really affect users.
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