Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/3964#discussion_r117838617
--- Diff: docs/dev/connectors/index.md ---
@@ -25,22 +25,54 @@ specific language governing permissions and limitations
under the License.
-->
-Connectors provide code for interfacing with various third-party systems.
+* toc
+{:toc}
-Currently these systems are supported: (Please select the respective
documentation page from the navigation on the left.)
+## Predefined Sources and Sinks
- * [Apache Kafka](https://kafka.apache.org/) (sink/source)
- * [Elasticsearch](https://elastic.co/) (sink)
- * [Hadoop FileSystem](http://hadoop.apache.org) (sink)
- * [RabbitMQ](http://www.rabbitmq.com/) (sink/source)
- * [Amazon Kinesis Streams](http://aws.amazon.com/kinesis/streams/)
(sink/source)
- * [Twitter Streaming API](https://dev.twitter.com/docs/streaming-apis)
(source)
- * [Apache NiFi](https://nifi.apache.org) (sink/source)
- * [Apache Cassandra](https://cassandra.apache.org/) (sink)
+A few basic data sources and sinks are built into Flink and are always
available.
+The [predefined data sources]({{ site.baseurll
}}/dev/datastream_api.html#data-sources) include reading from files,
directories, and sockets, and
--- End diff --
Should there be a comma between sockets and and?
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