Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/3838#discussion_r117724604
--- Diff:
flink-libraries/flink-streaming-python/src/main/java/org/apache/flink/streaming/python/api/datastream/PythonObjectInputStream2.java
---
@@ -0,0 +1,68 @@
+/*
+ * 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.
+ */
+
+package org.apache.flink.streaming.python.api.datastream;
+
+import org.python.util.PythonObjectInputStream;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectStreamClass;
+
+/**
+ * A helper class to overcome the inability to set the serialVersionUID in
a python user-defined
+ * function (UDF).
+ * <p>The fact the this field is not set, results in a dynamic calculation
of this serialVersionUID,
+ * using SHA, to make sure it is a unique number. This unique number is a
64-bit hash of the
+ * class name, interface class names, methods, and fields. If a Python
class inherits from a
+ * Java class, as in the case of Python UDFs, then a proxy wrapper class
is created. Its name is
+ * constructed using the following pattern:
+ * <b>{@code
org.python.proxies.<module-name>$<UDF-class-name>$<number>}</b>. The {@code
<number>}
+ * part is increased by one in runtime, for every job submission. It
results in different serial
+ * version UID for each run for the same Python class. Therefore, it is
required to silently
+ * suppress the serial version UID mismatch check.</p>
+ */
+public class PythonObjectInputStream2 extends PythonObjectInputStream {
--- End diff --
remove ´2` from name.
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