Question

我正在和Kafka Streams一起玩，面对的情况对我来说似乎有些奇怪。我确实搜索过但找不到合适的答案。在处理流中的元素时，如果发生任何未处理的异常，发生以下错误并且Kafka Streams无法恢复，则停止处理更多消息，然后我需要重新启动我的应用程序。

2018-05-17 11:00:51.304  INFO 43810 --- [-StreamThread-3] o.a.k.s.p.internals.StreamThread         : stream-thread [snapshot-stream-application-a1dbc5d4-1742-4af2-9919-d4f5f861bb36-StreamThread-3] Stream thread shutdown complete
2018-05-17 11:00:51.304  WARN 43810 --- [-StreamThread-3] o.a.k.s.p.internals.StreamThread         : stream-thread [snapshot-stream-application-a1dbc5d4-1742-4af2-9919-d4f5f861bb36-StreamThread-3] Unexpected state transition from RUNNING to DEAD.
2018-05-17 11:00:51.305 ERROR 43810 --- [-StreamThread-3] c.u.kafkastreams.config.SnapshotStream   : Error while processing:

org.apache.kafka.streams.errors.ProcessorStateException: task [0_4] Failed to flush state store KTABLE-SOURCE-STATE-STORE-0000000000

确保捕获所有异常将解决问题，但我正在寻找适用于Kafka Streams的异常处理机制。这是我的示例代码：

  private KafkaStreams streams;

    @PostConstruct
    public void runStreams() {
        KStreamBuilder builder = new KStreamBuilder();
        KTable<String, String> snapshotTable = builder.table(kafkaProperties.getInputTopic());
        snapshotTable.toStream().foreach((key, value) -> {
            process(value);
        });

        streams = new KafkaStreams(builder, consumerProps());
        streams.cleanUp();
        streams.start();
        streams.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread t, Throwable e) {
                LOGGER.error("Error while processing:", e);
            }
        });
    }

    private void process(String message) {
        simulateException(message);
        LOGGER.info("Key: {} Value: {}", key, value);
    }

    private void simulateException(String message) {
        if (message.contains("abc")) {
            throw new RuntimeException();
        }
    }

    @PreDestroy
    private void closeStream() {
        streams.close();
    }

    private Properties consumerProps() {
        Properties config = new Properties();
        config.put(StreamsConfig.APPLICATION_ID_CONFIG, "stream-application");
        config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaProperties.getBootstrap());
        config.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass());
        config.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass());
        config.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 10000);
        config.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
        config.put(StreamsConfig.NUM_STREAM_THREADS_CONFIG, 3);
        return config;
    }

（我尝试过使用kafka-streams 0.11.0.0和1.1.0）

处理消息时，Kafka Streams在异常情况下无法恢复

0 个答案: