Github user alpinegizmo commented on a diff in the pull request:
https://github.com/apache/flink/pull/4441#discussion_r131085493
--- Diff: docs/dev/stream/state/custom_serialization.md ---
@@ -0,0 +1,188 @@
+---
+title: "Custom Serialization for Managed State"
+nav-title: "Custom Serialization"
+nav-parent_id: streaming_state
+nav-pos: 10
+---
+<!--
+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.
+-->
+
+If your application uses Flink's managed state, it might be necessary to
implement a custom serialization logic for special use cases.
--- End diff --
drop the word "a" in "implement a custom serialization logic" so that it
reads "implement custom serialization logic"
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