线程"main"中的异常org.apache.kafka.streams.errors.InvalidStateStoreException: [英] Exception in thread "main" org.apache.kafka.streams.errors.InvalidStateStoreException:
问题描述
我正在尝试访问在同一Java程序中创建的inMemoryStore.但是返回一个异常线程主要"中的异常org.apache.kafka.streams.errors.InvalidStateStoreException:状态存储storeName可能已迁移到另一个实例."
I am trying to access the inMemoryStore that I am creating with in the same java program. But returning a exception as "Exception in thread "main" org.apache.kafka.streams.errors.InvalidStateStoreException: The state store, storeName, may have migrated to another instance."
当我使用persistentKeyValueStore时,它可以正常工作,并且能够创建存储并返回值.
When I am using the persistentKeyValueStore it is working fine and able to create the store and return the values.
package com.bakdata.streams_store.demo;
import java.util.Collection;
import java.util.Properties;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
import org.apache.kafka.streams.state.KeyValueStore;
import org.apache.kafka.streams.state.QueryableStoreTypes;
import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
import org.apache.kafka.streams.state.StoreBuilder;
import org.apache.kafka.stre7ams.state.Stores;
import org.apache.kafka.streams.state.StreamsMetadata;
public class InMemoryStore {
public static void main(String[] args) throws Exception {
Properties props = new Properties();
props.put(StreamsConfig.APPLICATION_ID_CONFIG, "stream-id-0001");
props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass());
props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass());
String storeName = "sample";
KeyValueBytesStoreSupplier stateStore = Stores.inMemoryKeyValueStore(storeName);
StoreBuilder<KeyValueStore<String, String>> storeBuilder = Stores.keyValueStoreBuilder(stateStore, Serdes.String(), Serdes.String());
StreamsBuilder builder = new StreamsBuilder();
builder.addStateStore(storeBuilder);
KStream<String, String> inputStream = builder.stream("material_test1");
KafkaStreams streams = new KafkaStreams(builder.build(), props);
try {
streams.start();
Thread.sleep(30000);
} catch (final Throwable e) {
System.exit(1);
}
final ReadOnlyKeyValueStore<String, String> keyValueStore = streams.store(storeName, QueryableStoreTypes.keyValueStore());
KeyValueIterator<String, String> range = keyValueStore.all();
while (range.hasNext()) {
KeyValue<String, String> next = range.next();
System.out.println("Key: " + next.key + ", value: " + next.value);
}
}
}
线程主"中的异常org.apache.kafka.streams.errors.InvalidStateStoreException:状态存储,样本可能已迁移到另一个实例.在org.apache.kafka.streams.state.internals.QueryableStoreProvider.getStore(QueryableStoreProvider.java:62)在org.apache.kafka.streams.KafkaStreams.store(KafkaStreams.java:1067)在com.bakdata.streams_store.demo.InMemoryStore.main(InMemoryStore.java:59)
Exception in thread "main" org.apache.kafka.streams.errors.InvalidStateStoreException: The state store, sample, may have migrated to another instance. at org.apache.kafka.streams.state.internals.QueryableStoreProvider.getStore(QueryableStoreProvider.java:62) at org.apache.kafka.streams.KafkaStreams.store(KafkaStreams.java:1067) at com.bakdata.streams_store.demo.InMemoryStore.main(InMemoryStore.java:59)
我希望从ReadOnlyStoreQuery打印这些值.
I am expecting to print the values from the ReadOnlyStoreQuery.
推荐答案
您不能在流上拥有StateStore,因为单个键可能有多个值.您需要先将其转换为KTable( streams.table(...)
)或GlobalKtable( streams.globalTable(...)
).
You cannot have a StateStore on a stream as there could be multiple values for a single key. You need to turn it into a KTable (streams.table(...)
) or GlobalKtable (streams.globalTable(...)
) first.
科特琳(Kotlin)示例:
Kotlin example:
val businessObjects = streamsBuilder.globalTable("topic", eventStore("store-name"))
其中 eventStore
是:
fun eventStore(name: String) = Materialized.`as`<String, String>(Stores.inMemoryKeyValueStore(name))
.withKeySerde(Serdes.String())
.withValueSerde(Serdes.String())
启动流后:
var store: ReadOnlyKeyValueStore<String, String> = streams.store("store-name", keyValueStore<String, String>())
注意:当流准备就绪时,还有一个接口 KafkaStreams.StateListener
Note: There is also an interface KafkaStreams.StateListener
for when the streams are ready
override fun onChange(newState: KafkaStreams.State?, oldState: KafkaStreams.State?) =
Option.fromNullable(newState)
.filter { REBALANCING == oldState && RUNNING == it }
.map { store = streams.store("store-name", keyValueStore<String, String>()) }
.getOrElse { log.info("Waiting for Kafka being in REBALANCING -> RUNNING, but it is $oldState -> $newState") }
或者,您也可以使用
stream.groupByKey().reduce(...)
像此处所述.
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