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
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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
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2.问题分析
# 配置文件里的
acks: all
# log里的
acks = 1
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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
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错误的示范（能生效就怪了）：
mybatis:
typeAliasesPackage: com.test.app
kafka:
bootstrap-servers: xxx.xxx.x.xxx:9092
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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
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