[GitHub] [flink] alpinegizmo commented on a change in pull request #11834: [FLINK-17237][docs] Add Intro to DataStream API tutorial

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alpinegizmo commented on a change in pull request #11834:
URL: https://github.com/apache/flink/pull/11834#discussion_r412124573



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File path: docs/tutorials/datastream_api.md
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@@ -0,0 +1,252 @@
+---
+title: Intro to the DataStream API
+nav-id: datastream-api
+nav-pos: 2
+nav-title: Intro to the DataStream API
+nav-parent_id: tutorials
+permalink: /tutorials/datastream_api.html
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+The focus of this tutorial is to broadly cover the DataStream API well enough that you will be
+able to get started writing streaming applications. 
+
+* This will be replaced by the TOC
+{:toc}
+
+## What can be Streamed?
+
+Flink's DataStream APIs for Java and Scala will let you stream anything they can serialize. Flink's
+own serializer is used for
+
+- basic types, i.e., String, Long, Integer, Boolean, Array
+- composite types: Tuples, POJOs, and Scala case classes
+
+and Flink falls back to Kryo for other types. It's also possible to use other serializers with
+Flink. Avro, in particular, is well supported.
+
+### Java tuples and POJOs
+
+Flink's native serializer can operate efficiently on tuples and POJOs.
+
+#### Tuples
+
+For Java, Flink defines its own Tuple1 thru Tuple25 types.

Review comment:
       True, but Tuple0 is weird. What's it for?




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