Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/5807#discussion_r187677168
--- Diff:
flink-end-to-end-tests/flink-queryable-state-test/src/main/java/org/apache/flink/streaming/tests/queryablestate/QsStateProducer.java
---
@@ -0,0 +1,182 @@
+/*
+ * 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.queryablestate;
+
+import org.apache.flink.api.common.functions.RichFlatMapFunction;
+import org.apache.flink.api.common.state.MapState;
+import org.apache.flink.api.common.state.MapStateDescriptor;
+import org.apache.flink.api.common.typeinfo.TypeHint;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.api.java.utils.ParameterTool;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.contrib.streaming.state.RocksDBStateBackend;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.runtime.state.StateBackend;
+import org.apache.flink.runtime.state.filesystem.FsStateBackend;
+import org.apache.flink.runtime.state.memory.MemoryStateBackend;
+import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
+import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.source.RichSourceFunction;
+import org.apache.flink.util.Collector;
+
+import org.apache.flink.shaded.guava18.com.google.common.collect.Iterables;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Random;
+
+/**
+ * Streaming application that creates an {@link Email} pojo with random
ids and increasing
+ * timestamps and passes it to a stateful {@link
org.apache.flink.api.common.functions.FlatMapFunction},
+ * where it is exposed as queryable state.
+ */
+public class QsStateProducer {
+
+ public static final String QUERYABLE_STATE_NAME = "state";
+ public static final String STATE_NAME = "state";
+
+ public static void main(final String[] args) throws Exception {
+ final StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+
+ ParameterTool tool = ParameterTool.fromArgs(args);
+ String tmpPath = tool.getRequired("tmp-dir");
+ String stateBackendType = tool.getRequired("state-backend");
+
+ StateBackend stateBackend;
+ switch (stateBackendType) {
+ case "rocksdb":
+ stateBackend = new RocksDBStateBackend(tmpPath);
+ break;
+ case "fs":
+ stateBackend = new FsStateBackend(tmpPath);
+ break;
+ case "memory":
+ stateBackend = new MemoryStateBackend();
+ break;
+ default:
+ throw new RuntimeException("Unsupported state
backend " + stateBackendType);
+ }
+
+ env.setStateBackend(stateBackend);
+ env.enableCheckpointing(1000L);
+ env.getCheckpointConfig().setMaxConcurrentCheckpoints(1);
+ env.getCheckpointConfig().setMinPauseBetweenCheckpoints(0);
+
+ env.addSource(new EmailSource())
+ .keyBy(new KeySelector<Email, String>() {
+
+ private static final long serialVersionUID =
-1480525724620425363L;
+
+ @Override
+ public String getKey(Email value) throws
Exception {
+ return "";
+ }
+ })
+ .flatMap(new MyFlatMap());
+
+ env.execute();
+ }
+
+ private static class EmailSource extends RichSourceFunction<Email> {
+
+ private static final long serialVersionUID =
-7286937645300388040L;
+
+ private Random random;
--- End diff --
The `random` should be `transient`
---
