Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/17246#discussion_r106720722
--- Diff: docs/structured-streaming-kafka-integration.md ---
@@ -373,11 +375,204 @@ The following configurations are optional:
</tr>
</table>
+## Producing Data to Kafka
+
+### Writing Streaming Queries to Kafka
+
+<div class="codetabs">
+<div data-lang="scala" markdown="1">
+{% highlight scala %}
+
+// Write key-value data from a DataFrame to a specific Kafka topic
specified in an option
+val s1 = df1
+ .selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)")
+ .writeStream
+ .format("kafka")
+ .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
+ .option("topic", "topic1")
+ .start()
+
+// Write key-value data from a DataFrame to Kafka using a topic specified
in the data
+val s2 = df2
+ .selectExpr("topic", "CAST(key AS STRING)", "CAST(value AS STRING)")
+ .writeStream
+ .format("kafka")
+ .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
+ .start()
+
+{% endhighlight %}
+</div>
+<div data-lang="java" markdown="1">
+{% highlight java %}
+
+// Write key-value data from a DataFrame to a specific Kafka topic
specified in an option
+StreamingQuery s1 = df1
+ .selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)")
+ .writeStream()
+ .format("kafka")
+ .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
+ .option("topic", "topic1")
+ .start()
+
+// Write key-value data from a DataFrame to Kafka using a topic specified
in the data
+StreamingQuery s2 = df1
--- End diff --
nit: did you mean df2? or just make all of them df?
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