java - Flink奇怪的 "Cannot Serialize operator object class ...CoBroadcastWithNonKeyedOperator"错误

Question

我正在尝试使用 BroadcastState 设置一个项目，但由于某种原因，当我尝试运行它时收到此错误:

org.apache.flink.streaming.runtime.tasks.StreamTaskException:无法序列化运算符对象类org.apache.flink.streaming.api.operators.co.CoBroadcastWithNonKeyedOperator。

我不知道为什么它会抛出它。传入和输出的对象(SampleInput 和 Token)是非常简单的 avro 生成的 pojo，具有两个或三个字段，我尝试将 BroadcastProcessFunction 的方法留空，以删除我可以设置的任何内容，使其无法序列化，但是仍然收到错误。这是代码的相关部分:

//Sideoutput that error strings will be written to
    OutputTag<String> sideOutputTag = new OutputTag<String>("side-output") {};

    //<Setup for broadcast state>
    StateTtlConfig ttlConfig = StateTtlConfig
            .newBuilder(Time.seconds(1))
            .setUpdateType(StateTtlConfig.UpdateType.OnCreateAndWrite)
            .setStateVisibility(StateTtlConfig.StateVisibility.NeverReturnExpired)
            .cleanupFullSnapshot()
            .build();

    final MapStateDescriptor<String, Token> ruleStateDescriptor = new MapStateDescriptor<>(
            "oathTokens",
            BasicTypeInfo.STRING_TYPE_INFO,
            AvroTypeInfo.of(new TypeHint<Token>() {}));
    ruleStateDescriptor.enableTimeToLive(ttlConfig);

    DataStream<Token> tokenObjectStream = tokenSourceStream.process(new JsonToTokenProcessFunction(sideOutputTag))
            .startNewChain()
            .uid("tokenObjectStream")
            .name("tokenObjectStream");

    BroadcastStream<Token> ruleBroadcastStream = tokenObjectStream.broadcast(ruleStateDescriptor);
    //</Config for broadcast state>


    //<Main Data Input Stream>
    DataStream<SampleInput> jsonToSampleInput = kafkaStream.process(new JsonToPojoProcessFunction(sideOutputTag))
            .startNewChain()
            .uid("sampleInputStream")
            .name("sampleInputStream");

    BroadcastConnectedStream<SampleInput, Token> broadcastConnectedStream = jsonToSampleInput.connect(ruleBroadcastStream);

    DataStream<SampleInput> matchedBroadcastStream = broadcastConnectedStream.process(new BroadcastProcessFunction<SampleInput, Token, SampleInput>() {

        @Override
        public void processElement(SampleInput sampleInput, ReadOnlyContext readOnlyContext, Collector<SampleInput> collector) throws Exception {

        }

        @Override
        public void processBroadcastElement(Token token, Context context, Collector<SampleInput> collector) throws Exception {

        }
    });

任何帮助将不胜感激。我确信我只是忽略了一些事情。谢谢!

Answer 1

事实证明 ttlConfig 对象是不可序列化的。删除它解决了该问题。