InvalidStateStoreException：状态存储未在Kafka流中打开

Question

StreamsBuilder builder = new StreamsBuilder();

    Map<String, ?> serdeConfig = Collections.singletonMap(SCHEMA_REGISTRY_URL_CONFIG, schemaRegistryUrl);

    Serde keySerde= getSerde(keyClass);
    keySerde.configure(serdeConfig,true);

    Serde valueSerde = getSerde(valueClass);
    valueSerde.configure(serdeConfig,false);

    StoreBuilder<KeyValueStore<K,V>> store =
        Stores.keyValueStoreBuilder(
            Stores.persistentKeyValueStore("mystore"),
            keySerde,valueSerde).withCachingEnabled();

    builder.addGlobalStore(store,"mytopic", Consumed.with(keySerde,valueSerde),this::processMessage);

    streams=new KafkaStreams(builder.build(),properties);

    registerShutdownHook();

    streams.start();

    readOnlyKeyValueStore = waitUntilStoreIsQueryable("mystore", QueryableStoreTypes.<Object, V>keyValueStore(), streams);


private <T> T waitUntilStoreIsQueryable(final String storeName,
      final QueryableStoreType<T> queryableStoreType,
      final KafkaStreams streams) {

    // 25 seconds
    long timeout=250;

    while (timeout>0) {
      try {
        timeout--;
        return streams.store(storeName, queryableStoreType);
      } catch (InvalidStateStoreException ignored) {
        // store not yet ready for querying
        try {
          Thread.sleep(100);
        } catch (InterruptedException e) {
          logger.error(e);
        }
      }
    }
    throw new StreamsException("ReadOnlyKeyValueStore is not queryable within 25 seconds");
  }

错误如下：

19:42:35.049 [my_component.app-91fa5d9f-aba8-4419-a063-93635903ff5d-GlobalStreamThread] ERROR org.apache.kafka.streams.processor.internals.GlobalStreamThread$StateConsumer - global-stream-thread [my_component.app-91fa5d9f-aba8-4419-a063-93635903ff5d-GlobalStreamThread] Updating global state failed. You can restart KafkaStreams to recover from this error.
org.apache.kafka.clients.consumer.OffsetOutOfRangeException: Offsets out of range with no configured reset policy for partitions: {my_component-0=6}
    at org.apache.kafka.clients.consumer.internals.Fetcher.parseCompletedFetch(Fetcher.java:990) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.internals.Fetcher.fetchedRecords(Fetcher.java:491) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.KafkaConsumer.pollForFetches(KafkaConsumer.java:1269) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1200) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1176) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.streams.processor.internals.GlobalStreamThread$StateConsumer.pollAndUpdate(GlobalStreamThread.java:239) [kafka-streams-2.3.0.jar:?]
    at org.apache.kafka.streams.processor.internals.GlobalStreamThread.run(GlobalStreamThread.java:290) [kafka-streams-2.3.0.jar:?]
19:42:35.169 [my_component.app-91fa5d9f-aba8-4419-a063-93635903ff5d-GlobalStreamThread] ERROR org.apache.kafka.streams.KafkaStreams - stream-client [my_component.app-91fa5d9f-aba8-4419-a063-93635903ff5d] Global thread has died. The instance will be in error state and should be closed.
19:42:35.169 [my_component.app-91fa5d9f-aba8-4419-a063-93635903ff5d-GlobalStreamThread] ERROR org.apache.zookeeper.server.NIOServerCnxnFactory - Thread Thread[my_component.app-91fa5d9f-aba8-4419-a063-93635903ff5d-GlobalStreamThread,5,main] died
org.apache.kafka.streams.errors.StreamsException: Updating global state failed. You can restart KafkaStreams to recover from this error.
    at org.apache.kafka.streams.processor.internals.GlobalStreamThread$StateConsumer.pollAndUpdate(GlobalStreamThread.java:250) ~[kafka-streams-2.3.0.jar:?]
    at org.apache.kafka.streams.processor.internals.GlobalStreamThread.run(GlobalStreamThread.java:290) ~[kafka-streams-2.3.0.jar:?]
Caused by: org.apache.kafka.clients.consumer.OffsetOutOfRangeException: Offsets out of range with no configured reset policy for partitions: {my_component-0=6}
    at org.apache.kafka.clients.consumer.internals.Fetcher.parseCompletedFetch(Fetcher.java:990) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.internals.Fetcher.fetchedRecords(Fetcher.java:491) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.KafkaConsumer.pollForFetches(KafkaConsumer.java:1269) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1200) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1176) ~[kafka-clients-2.2.1.jar:?]
    at org.apache.kafka.streams.processor.internals.GlobalStreamThread$StateConsumer.pollAndUpdate(GlobalStreamThread.java:239) ~[kafka-streams-2.3.0.jar:?]
    ... 1 more

org.apache.kafka.streams.errors.InvalidStateStoreException: State store is not available anymore and may have been migrated to another instance; please re-discover its location from the state metadata.

    at org.apache.kafka.streams.state.internals.CompositeReadOnlyKeyValueStore.get(CompositeReadOnlyKeyValueStore.java:60)

我看到两个不同的例外。

1. InvalidStateStoreException-存储未打开

2. InvalidStateStoreException-存储不再可用，可能已迁移到另一个实例

我只有一个运行Windows的流应用程序实例，并且具有应用程序ID。

从上面的核心来看，我一直在等待商店可查询，但是仍然无法打开商店，并且商店可能不可用。

发生异常（及其解决方案）的可能原因是什么？

首先，以上代码写的正确吗？

Answer 1

OffsetOutOfRangeException表示以.checkpoint文件状态存储的偏移量超出Kafka群集中主题偏移量的范围。

清除和/或重新创建主题时，会发生这种情况。 它可能不包含检查点中给定偏移量那么多的消息。

我发现，重置.checkpoint文件会有所帮助。 .checkpoint文件将是这样的。

0
1
my_component 0  6
my_component 1  0

这里，0是分区，6是偏移量。 同样，1是分区，0是偏移量。

异常描述my_component-0-6表示my_component主题的第0个分区的第6个偏移量超出范围。

由于重新创建了主题，因此第六偏移量不存在。 因此将6更改为0。

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重要的是要注意，在对Kafka进行单元测试时，测试完成后必须清理状态目录，因为在测试完成后嵌入式Kafka集群及其主题不存在，因此保留它是没有意义的。状态存储区中的偏移量（因为它们将变得过时）。

因此，请确保在测试后清理您的状态目录（通常是/tmp/kafka-streams或Windows C:\\tmp\\kafka-streams中的状态目录）。

另外，重置检查点文件仅是一种解决方法，并不是生产中的理想解决方案。

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在生产中，如果状态存储与其对应主题的存储不兼容（即偏移量超出范围），则意味着存在某种损坏，可能有人删除或重新创建了该主题。

我认为，在这种情况下，清理可能是唯一的解决方案。 因为，您的状态存储区包含过时的信息，因此该信息不再有效（就新主题而言）。