Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5425#discussion_r166972253
  
    --- Diff: 
flink-examples/flink-examples-streaming/src/main/java/org/apache/flink/streaming/examples/broadcast/BroadcastExample.java
 ---
    @@ -0,0 +1,137 @@
    +/*
    + * 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.examples.broadcast;
    +
    +import org.apache.flink.api.common.functions.FlatMapFunction;
    +import org.apache.flink.api.common.functions.MapFunction;
    +import org.apache.flink.api.common.state.MapStateDescriptor;
    +import org.apache.flink.api.common.state.ValueState;
    +import org.apache.flink.api.common.state.ValueStateDescriptor;
    +import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
    +import org.apache.flink.api.java.functions.KeySelector;
    +import org.apache.flink.api.java.tuple.Tuple2;
    +import org.apache.flink.runtime.state.KeyedStateFunction;
    +import org.apache.flink.streaming.api.datastream.BroadcastStream;
    +import org.apache.flink.streaming.api.datastream.DataStream;
    +import org.apache.flink.streaming.api.datastream.KeyedStream;
    +import 
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
    +import 
org.apache.flink.streaming.api.functions.co.KeyedBroadcastProcessFunction;
    +import org.apache.flink.util.Collector;
    +
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Map;
    +
    +/**
    + * Testing example.
    + */
    +public class BroadcastExample {
    +
    +   public static void main(String[] args) throws Exception {
    +
    +           final List<Integer> input = new ArrayList<>();
    +           input.add(1);
    +           input.add(2);
    +           input.add(3);
    +           input.add(4);
    +
    +           final List<Tuple2<Integer, Integer>> keyedInput = new 
ArrayList<>();
    +           keyedInput.add(new Tuple2<>(1, 1));
    +           keyedInput.add(new Tuple2<>(1, 5));
    +           keyedInput.add(new Tuple2<>(2, 2));
    +           keyedInput.add(new Tuple2<>(2, 6));
    +           keyedInput.add(new Tuple2<>(3, 3));
    +           keyedInput.add(new Tuple2<>(3, 7));
    +           keyedInput.add(new Tuple2<>(4, 4));
    +           keyedInput.add(new Tuple2<>(4, 8));
    +
    +           final ValueStateDescriptor<String> valueState = new 
ValueStateDescriptor<>("any", BasicTypeInfo.STRING_TYPE_INFO);
    +
    +           StreamExecutionEnvironment env = 
StreamExecutionEnvironment.getExecutionEnvironment();
    +
    +           final MapStateDescriptor<String, Integer> mapStateDescriptor = 
new MapStateDescriptor<>(
    +                           "Broadcast", BasicTypeInfo.STRING_TYPE_INFO, 
BasicTypeInfo.INT_TYPE_INFO
    +           );
    +
    +           KeyedStream<Tuple2<Integer, Integer>, Integer> elementStream = 
env.fromCollection(keyedInput).rebalance()
    --- End diff --
    
    I'd put the `rebalance()` on a new line and maybe add a comment on why it's 
needed


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