apache-flink - Flink Process Function 没有将数据返回到 Sideoutputstream

Question

我正在尝试使用一组规则验证 JSONObject 如果 json 与一组规则匹配，它将返回匹配的规则，而 JSONObject 如果不是，它将返回一个 JSONObject 到 Sideoutput 所有这些都在 ProcessFuntion 中处理，我得到了主要输出但无法捕获侧面输出

SideOutput Stream 定义如下

public final static OutputTag<org.json.JSONObject> unMatchedJSONSideOutput = new OutputTag<org.json.JSONObject>(
            "unmatched-side-output") {};

ProcessFunction 定义如下

public class RuleFilter extends ProcessFunction<Tuple2<String,org.json.JSONObject>,Tuple2<String,org.json.JSONObject>> {
@Override
    public void processElement(Tuple2<String, org.json.JSONObject> value,
            ProcessFunction<Tuple2<String, org.json.JSONObject>, Tuple2<String, org.json.JSONObject>>.Context ctx,
            Collector<Tuple2<String, org.json.JSONObject>> out) throws Exception {

        if(this.value.matches((value.f1))) {
        out.collect(new Tuple2<String, org.json.JSONObject>(value.f0,value.f1));
        }else {
            ctx.output(RuleMatching.unMatchedJSONSideOutput,value.f1);
        }
    }
}

我正在打印主数据流输出，如下所示

    DataStream<Tuple2<String, org.json.JSONObject>> matchedJSON =
                            inputSignal.map(new MapFunction<org.json.JSONObject, Tuple2<String, org.json.JSONObject>>() {
                                @Override
                                public Tuple2<String, org.json.JSONObject> map(org.json.JSONObject input) throws Exception {
                                    return new Tuple2<>(value, input);
                                }
                            }).process(new RuleFilter()).print("MatchedJSON=>");

matchedJSON .print("matchedJSON=>");

我正在打印 Sideoutput 如下

DataStream<org.json.JSONObject> unmatchedJSON =
                        ((SingleOutputStreamOperator<org.json.JSONObject>) matchedJSON.map(new MapFunction<Tuple2<String, org.json.JSONObject>, org.json.JSONObject>() {
                            @Override
                            public org.json.JSONObject map(Tuple2<String, org.json.JSONObject> value) throws Exception {
                                return value.f1;
                            }
                        })).getSideOutput(unMatchedJSONSideOutput );

                unmatchedJSON.print("unmatchedJSON=>");

主流正在打印输出，但侧输出未打印无效 json 请帮助解决问题

Answer 1

问题在这里:

DataStream<org.json.JSONObject> unmatchedJSON =
    ((SingleOutputStreamOperator<org.json.JSONObject>) matchedJSON.map(...))
    .getSideOutput(unMatchedJSONSideOutput);

您应该调用 getSideOutput直接上 matchedJSON ，而不是应用 MapFunction 的结果给它。只有 ProcessFunction可以有一个侧面输出，它需要直接来自 ProcessFunction .您通过从映射中转换输出流来欺骗编译器接受这一点，但运行时对此无法做任何有意义的事情。