加入两个流不起作用

Question

我正在尝试使用Apache Flink流API连接两个流，但没有任何内容加入，我在阅读文档后不知道，我做错了什么

    StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
    DataStream<MyPojo2> source = env.fromCollection(Lists.newArrayList(new MyPojo2(1, "Ola"), new MyPojo2(2, "Ola")))
            .assignTimestampsAndWatermarks(new IngestionTimeExtractor<MyPojo2>());
    DataStream<MyPojo2> source2 = env.fromCollection(Lists.newArrayList(new MyPojo2(1, "Ela"), new MyPojo2(2, "Ela")))
            .assignTimestampsAndWatermarks(new IngestionTimeExtractor<MyPojo2>());
    DataStream<Tuple2<String, String>> joined = source.join(source2).where(keySelector).equalTo(keySelector).
            window(GlobalWindows.create()).apply(joinFunction);
    joined.print();
    env.execute("Window");

关键功能只是myPojo.getFirst()

Answer 1

除非您指定自定义GlobalWindows，否则Trigger窗口永远不会触发。在您的示例中，如果您使用TumblingEventTimeWindows.of(Time.seconds(5))之类的内容，则应该看到结果。