我使用Kafka 2.3.0。 我有一个反应式控制器，应该将记录发送到一个主题。我尝试完全设置一次投放并将这些值添加到我的属性中：
processing.guarantee: exactly_once
isolation.level: read_committed
enable.auto.commit: false
linger.ms: 100
producer.linger.ms: 100
fetch.max.wait.ms: 100
partition-count: 16
replication.factor: 1
max.in.flight.requests.per.connection: 1
我在创建发件人期间设置了transactionalId。有一种方法可以将请求部分发送到主题：
protected Mono<SenderResult<String>> sendToTopic(@NonNull final String correlationId,
@NonNull final AbstractCommandRequest request) {
return Flux
.just(SenderRecord.create(
new ProducerRecord<>(internalCoreTopic,
new ProjectChannelKey(request.getProjectId(), request.getChannelId()), request),
correlationId))
.subscriberContext(ctx -> addMDC(request, ctx))
.flatMap(records -> sender.sendTransactionally(Flux.just(Flux.just(records))))
.concatMap(r -> r)
.reduce((a, b) -> {
if (b.exception() != null) {
return b;
}
return a;
});
}
它可以工作，但是发送者不会等到之前的事务被提交。而且我有时会收到这种例外情况：
12:01:43.482 [1ingress-forwarders-tridproject-internal-core-2] ERROR c.l.k.m.c.i.rest.IngressController corr.id=009d0d8a-7e58-4f04-a93d-5540047db732/1568970103473:4 - TransactionalId 1ingress-forwarders-tridproject-internal-core: Invalid transition attempted from state IN_TRANSACTION to state IN_TRANSACTION
org.apache.kafka.common.KafkaException: TransactionalId 1ingress-forwarders-tridproject-internal-core: Invalid transition attempted from state IN_TRANSACTION to state IN_TRANSACTION
at org.apache.kafka.clients.producer.internals.TransactionManager.transitionTo(TransactionManager.java:759)
at org.apache.kafka.clients.producer.internals.TransactionManager.transitionTo(TransactionManager.java:752)
at org.apache.kafka.clients.producer.internals.TransactionManager.beginTransaction(TransactionManager.java:217)
at org.apache.kafka.clients.producer.KafkaProducer.beginTransaction(KafkaProducer.java:643)
at reactor.kafka.sender.internals.DefaultKafkaSender$DefaultTransactionManager.lambda$null$0(DefaultKafkaSender.java:485)
at reactor.core.publisher.MonoCreate.subscribe(MonoCreate.java:53)
at reactor.core.publisher.MonoLift.subscribe(MonoLift.java:45)
at reactor.core.publisher.MonoOnAssembly.subscribe(MonoOnAssembly.java:61)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150)
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:353)
at com.project.common.config.mdc.MdcContextLifter.onNext(MdcContextLifter.java:33)
at reactor.core.publisher.MonoPublishOn$PublishOnSubscriber.run(MonoPublishOn.java:178)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:50)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:27)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Assembly trace from producer [reactor.core.publisher.MonoLift] :
reactor.core.publisher.Mono.create(Mono.java:183)
reactor.kafka.sender.internals.DefaultKafkaSender$DefaultTransactionManager.lambda$begin$1(DefaultKafkaSender.java:484)
Error has been observed by the following operator(s):
|_ Mono.create ⇢ reactor.kafka.sender.internals.DefaultKafkaSender$DefaultTransactionManager.lambda$begin$1(DefaultKafkaSender.java:484)
|_ Mono.flatMap ⇢ reactor.kafka.sender.internals.DefaultKafkaSender$DefaultTransactionManager.begin(DefaultKafkaSender.java:484)
|_ Mono.then ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:211)
|_ Mono.concatWith ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:212)
|_ Flux.thenMany ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:213)
|_ Flux.thenMany ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:213)
|_ Flux.concatWith ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:214)
|_ Flux.concatWith ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:216)
|_ Flux.concatWith ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:217)
|_ Flux.concatWith ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:218)
|_ Mono.error ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.lambda$transaction$13(TopicDescriptor.java:232)
|_ Flux.onErrorResume ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:226)
|_ Flux.publishOn ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.transaction(TopicDescriptor.java:239)
|_ Flux.concatMapDelayError ⇢ com.project.kafka.queues.TopicDescriptor$KafkaSenderWrapper.sendTransactionally(TopicDescriptor.java:154)
|_ Flux.concatMap ⇢ com.project.kafka.queues.rest.AbstractKafkaRestController.sendToTopic(AbstractKafkaRestController.java:73)
|_ Flux.reduce ⇢ com.project.kafka.queues.rest.AbstractKafkaRestController.sendToTopic(AbstractKafkaRestController.java:74)
|_ Mono.map ⇢ com.project.kafka.ms.client.ingress.rest.IngressController.sendCommandRequestToInternalCore(IngressController.java:263)
|_ Mono.then ⇢ com.project.kafka.ms.client.ingress.rest.IngressController.lambda$execCommand$7(IngressController.java:130)
|_ Mono.flatMap ⇢ com.project.kafka.ms.client.ingress.rest.IngressController.execCommand(IngressController.java:103)
|_ Mono.cast ⇢ com.project.kafka.ms.client.ingress.rest.IngressController.execCommand(IngressController.java:133)
如何强制事务等待上一次事务提交或中止？