我尝试在 Spring Boot 应用程序中使用 reactor kafka 创建与 Azure 事件中心的 Apache Kafka 连接。起初，我按照 Azure 官方教程设置 Azure 事件中心和 Spring 后端：https ://docs.microsoft.com/en-us/azure/developer/java/spring-framework/configure-spring-cloud-stream -binder-java-app-kafka-azure-event-hub 一切正常，我创建了一些更高级的服务。
但是，当尝试让 reactor kafka 与 Azure 事件中心一起工作时，它不起作用。当消费者被触发时，它不能消费任何消息并记录以下内容：
com.test.Application : Started Application in 10.442 seconds (JVM running for 10.771)
o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Discovered group coordinator mynamespacename.servicebus.windows.net:9093 (id: 2147483647 rack: null)
o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=test-client-0, groupId=$Default] (Re-)joining group
o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Successfully joined group with generation Generation{generationId=30, memberId='mynamespacename.servicebus.windows.net:c:$default:I:test-client-0-33016d4334614aa8b9b7bf3fd5e1023e', protocol='range'}
o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Finished assignment for group at generation 30: {mynamespacename.servicebus.windows.net:c:$default:I:test-client-0-33016d4334614aa8b9b7bf3fd5e1023e=Assignment(partitions=[my-event-hub-0])}
o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Successfully synced group in generation Generation{generationId=30, memberId='mynamespacename.servicebus.windows.net:c:$default:I:test-client-0-33016d4334614aa8b9b7bf3fd5e1023e', protocol='range'}
o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Notifying assignor about the new Assignment(partitions=[my-event-hub-0])
o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Adding newly assigned partitions: my-event-hub-0
o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=test-client-0, groupId=$Default] Setting offset for partition my-event-hub-0 to the committed offset FetchPosition{offset=17, offsetEpoch=Optional.empty, currentLeader=LeaderAndEpoch{leader=Optional[mynamespacename.servicebus.windows.net:9093 (id: 0 rack: null)], epoch=absent}}
o.s.k.l.KafkaMessageListenerContainer : $Default: partitions assigned: [my-event-hub-0]
o.a.k.clients.consumer.ConsumerConfig : ConsumerConfig values:
allow.auto.create.topics = true
auto.commit.interval.ms = 5000
auto.offset.reset = latest
bootstrap.servers = [mynamespacename.servicebus.windows.net:9093]
check.crcs = true
client.dns.lookup = use_all_dns_ips
client.id = test-client
client.rack =
connections.max.idle.ms = 540000
default.api.timeout.ms = 60000
enable.auto.commit = false
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = $Default
group.instance.id = null
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
internal.throw.on.fetch.stable.offset.unsupported = false
isolation.level = read_uncommitted
key.deserializer = class org.springframework.kafka.support.serializer.JsonDeserializer
max.partition.fetch.bytes = 1048576
max.poll.interval.ms = 300000
max.poll.records = 500
metadata.max.age.ms = 300000
metric.reporters = []
metrics.num.samples = 2
metrics.recording.level = INFO
metrics.sample.window.ms = 30000
partition.assignment.strategy = [class org.apache.kafka.clients.consumer.RangeAssignor]
receive.buffer.bytes = 65536
reconnect.backoff.max.ms = 1000
reconnect.backoff.ms = 50
request.timeout.ms = 30000
retry.backoff.ms = 100
sasl.client.callback.handler.class = null
sasl.jaas.config = null
sasl.kerberos.kinit.cmd = /usr/bin/kinit
sasl.kerberos.min.time.before.relogin = 60000
sasl.kerberos.service.name = null
sasl.kerberos.ticket.renew.jitter = 0.05
sasl.kerberos.ticket.renew.window.factor = 0.8
sasl.login.callback.handler.class = null
sasl.login.class = null
sasl.login.refresh.buffer.seconds = 300
sasl.login.refresh.min.period.seconds = 60
sasl.login.refresh.window.factor = 0.8
sasl.login.refresh.window.jitter = 0.05
sasl.mechanism = GSSAPI
security.protocol = PLAINTEXT
security.providers = null
send.buffer.bytes = 131072
session.timeout.ms = 10000
socket.connection.setup.timeout.max.ms = 127000
socket.connection.setup.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.3]
ssl.endpoint.identification.algorithm = https
ssl.engine.factory.class = null
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.certificate.chain = null
ssl.keystore.key = null
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLSv1.3
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.certificates = null
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.StringDeserializer
o.a.kafka.common.utils.AppInfoParser : Kafka version: 2.7.1
o.a.kafka.common.utils.AppInfoParser : Kafka commitId: 61dbce85d0d41457
o.a.kafka.common.utils.AppInfoParser : Kafka startTimeMs: 1629919378494
r.k.r.internals.ConsumerEventLoop : SubscribeEvent
o.a.k.clients.consumer.KafkaConsumer : [Consumer clientId=test-client, groupId=$Default] Subscribed to topic(s): my-event-hub
org.apache.kafka.clients.NetworkClient : [Consumer clientId=test-client, groupId=$Default] Bootstrap broker mynamespacename.servicebus.windows.net:9093 (id: -1 rack: null) disconnected
org.apache.kafka.clients.NetworkClient : [Consumer clientId=test-client, groupId=$Default] Bootstrap broker mynamespacename.servicebus.windows.net:9093 (id: -1 rack: null) disconnected
以下是代码：
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.springframework.stereotype.Service;
import reactor.core.publisher.Flux;
import reactor.kafka.receiver.KafkaReceiver;
import reactor.kafka.receiver.ReceiverOptions;
import reactor.kafka.receiver.ReceiverRecord;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
@Slf4j
@Service
public class StreamConsumer {
public Flux<Object> consumeMessages() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "mynamespacename.servicebus.windows.net:9093");
props.put(ConsumerConfig.CLIENT_ID_CONFIG, "test-client");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "$Default");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, org.springframework.kafka.support.serializer.JsonDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, org.apache.kafka.common.serialization.StringDeserializer.class);
ReceiverOptions<String, Object> receiverOptions = ReceiverOptions.create(props);
ReceiverOptions<String, Object> options = receiverOptions.subscription(Collections.singleton(KafkaConstants.KAFKA_TOPIC))
.addAssignListener(partitions -> log.debug("onPartitionsAssigned {}", partitions))
.addRevokeListener(partitions -> log.debug("onPartitionsRevoked {}", partitions));
Flux<ReceiverRecord<String, Object>> kafkaFlux = KafkaReceiver.create(options).receive();
return kafkaFlux.map(x -> "Test");
}
}
反应器代码使用相同的主题和组 id 常量。当客户端记录断开的连接时：
[Consumer clientId=test-client, groupId=$Default] Bootstrap broker mynamespacename.servicebus.windows.net:9093 (id: -1 rack: null) disconnected
我假设缺少将使用者正确连接到 Azure 事件中心的配置。