Hi, 我看你使用了System.currentTimeMillis(),有可能是分布式的情况下,多台TM上的机器时间不一致导致的吗?




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    Best!
    Xuyang





在 2024-04-20 19:04:14,"hhq" <424028...@qq.com.INVALID> 写道:
>我使用了一个基于处理时间的滚动窗口,窗口大小设置为60s,但是我在窗口的处理函数中比较窗口的结束时间和系统时间,偶尔会发现获取到的系统时间早于窗口结束时间(这里的提前量不大,只有几毫秒,但是我不清楚,这是flink窗口本身的原因还是我代码的问题)我没有找到原因,请求帮助
>
>public static void main(String[] args) throws Exception {
>
>    StreamExecutionEnvironment env = 
> StreamExecutionEnvironment.getExecutionEnvironment();
>    DataStreamSource<Integer> integerDataStreamSource = env.addSource(new 
> IntegerSource());
>
>    integerDataStreamSource
>            .keyBy(Integer::intValue)
>                    .window(TumblingProcessingTimeWindows.of(Time.seconds(60)))
>                            .process(new IntegerProcessFunction())
>                                    .setParallelism(1);
>
>    env.execute();
>}
>
>
>public class IntegerProcessFunction extends ProcessWindowFunction<Integer, 
>Object, Integer, TimeWindow> {
>    private Logger log;
>    @Override
>    public void open(Configuration parameters) throws Exception {
>        super.open(parameters);
>        this.log = Logger.getLogger(IntegerProcessFunction.class);
>    }
>
>    @Override
>    public void process(Integer integer, ProcessWindowFunction<Integer, 
> Object, Integer, TimeWindow>.Context context, Iterable<Integer> elements, 
> Collector<Object> out) throws Exception {
>        long currentTimeMillis = System.currentTimeMillis();
>        long end = context.window().getEnd();
>
>        if (currentTimeMillis < end) {
>            log <http://log.info/>.info <http://log.info/>("bad");
>        } else {
>            log <http://log.info/>.info <http://log.info/>("good");
>        }
>    }
>}
>

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