Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/5947#discussion_r185537151
--- Diff:
flink-end-to-end-tests/flink-stream-stateful-job-upgrade-test/src/main/java/org/apache/flink/streaming/tests/StatefulStreamJobUpgradeTestProgram.java
---
@@ -0,0 +1,128 @@
+/*
+ * 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.tests;
+
+import org.apache.flink.api.common.functions.JoinFunction;
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer;
+import org.apache.flink.api.java.utils.ParameterTool;
+import org.apache.flink.configuration.ConfigOption;
+import org.apache.flink.configuration.ConfigOptions;
+import org.apache.flink.streaming.api.datastream.KeyedStream;
+import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
+import
org.apache.flink.streaming.tests.artificialstate.eventpayload.ComplexPayload;
+
+import static
org.apache.flink.streaming.tests.DataStreamAllroundTestJobFactory.createArtificialKeyedStateMapper;
+import static
org.apache.flink.streaming.tests.DataStreamAllroundTestJobFactory.createEventSource;
+import static
org.apache.flink.streaming.tests.DataStreamAllroundTestJobFactory.createSemanticsCheckMapper;
+import static
org.apache.flink.streaming.tests.DataStreamAllroundTestJobFactory.createTimestampExtractor;
+import static
org.apache.flink.streaming.tests.DataStreamAllroundTestJobFactory.setupEnvironment;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Test upgrade of generic stateful job for Flink's DataStream API
operators and primitives.
+ *
+ * <p>The job is constructed of generic components from {@link
DataStreamAllroundTestJobFactory}.
+ * The gaol is to test successful state restoration after taking savepoint
and recovery with new job version.
--- End diff --
typo `gaol`
---
