Kafka【问题 02】KafkaTemplate 报错 Bootstrap broker localhost:9092 (id: -1 rack: null) disconnected 问题解决

1.报错信息

主要的报错信息：Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. 和 Bootstrap broker localhost:9092 (id: -1 rack: null) disconnected

报错详情如下：

[pool-10-thread-1] INFO  o.a.k.c.p.ProducerConfig - [logAll,361] - ProducerConfig values:
	acks = 1
	batch.size = 16384
	bootstrap.servers = [localhost:9092]
	buffer.memory = 33554432
	client.dns.lookup = use_all_dns_ips
	client.id = producer-1
	compression.type = none
	connections.max.idle.ms = 540000
	delivery.timeout.ms = 120000
	enable.idempotence = false
	interceptor.classes = []
	internal.auto.downgrade.txn.commit = true
	key.serializer = class org.apache.kafka.common.serialization.StringSerializer
	linger.ms = 0
	max.block.ms = 60000
	max.in.flight.requests.per.connection = 5
	max.request.size = 1048576
	metadata.max.age.ms = 300000
	metadata.max.idle.ms = 300000
	metric.reporters = []
	metrics.num.samples = 2
	metrics.recording.level = INFO
	metrics.sample.window.ms = 30000
	partitioner.class = class org.apache.kafka.clients.producer.internals.DefaultPartitioner
	receive.buffer.bytes = 32768
	reconnect.backoff.max.ms = 1000
	reconnect.backoff.ms = 50
	request.timeout.ms = 30000
	retries = 2147483647
	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
	socket.connection.setup.timeout.max.ms = 127000
	socket.connection.setup.timeout.ms = 10000
	ssl.cipher.suites = null
	ssl.enabled.protocols = [TLSv1.2]
	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 = TLSv1.2
	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
	transaction.timeout.ms = 60000
	transactional.id = null
	value.serializer = class org.apache.kafka.common.serialization.StringSerializer
[pool-10-thread-1] INFO  o.a.k.c.u.AppInfoParser - [<init>,119] - Kafka version: 2.7.1
[pool-10-thread-1] INFO  o.a.k.c.u.AppInfoParser - [<init>,120] - Kafka commitId: 61dbce85d0d41457
[pool-10-thread-1] INFO  o.a.k.c.u.AppInfoParser - [<init>,121] - Kafka startTimeMs: 1659944463125
[kafka-producer-network-thread | producer-1] WARN  o.a.k.c.NetworkClient - [processDisconnection,782] - [Producer clientId=producer-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available.
[kafka-producer-network-thread | producer-1] WARN  o.a.k.c.NetworkClient - [handleServerDisconnect,1079] - [Producer clientId=producer-1] Bootstrap broker localhost:9092 (id: -1 rack: null) disconnected

配置信息：

  kafka:
    bootstrap-servers: xxx.xxx.x.xxx:9092
    producer:
      retries: 0
      batch-size: 16384
      buffer-memory: 33554432
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
      acks: all
    consumer:
      group-id: test
      auto-commit-interval: 1S
      auto-offset-reset: earliest
      enable-auto-commit: true
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      session-timeout-ms: 30000
    listener:
      concurrency: 5

2.问题分析

# 配置文件里的
	acks: all
# log里的
	acks = 1

很显然是配置文件没有生效 😢 原来是一个很高阶（diji）的错误 😄 kafka的配置应该是在spring下的应该是这样：

spring:
  kafka:
    bootstrap-servers: xxx.xxx.x.xxx:9092

错误的示范（能生效就怪了）：

mybatis:
  typeAliasesPackage: com.test.app
  kafka:
    bootstrap-servers: xxx.xxx.x.xxx:9092

3.总结

不少问题是由于粗心大意，yaml的格式也是很重要的，否则会出现意想不到的错误，比如配置无法生效 😀 比如下边的 found a tab character that violates indentation

fail to parseJobConfig,
err: OmniParseFileToJobConfig 
failed: parseByBootstrap 
failed: While parsing config: yaml:
line 38: found a tab character that violates indentation