I used docker compose to start three services, kafka, zookeeper, and confluent kafka s3 sink connector.
Somehow the connector (to be more specific, connect-distributed script) keeps trying to connect to localhost:9092 and ignores the configuration read properly from the properties file.
As you can see, the debug info shows AdminClientConfig values which has the correct boostrap.servers. but later, the AdminClient somehow keeps trying 127.0.0.1:9092.
Is it a bug in the connector?
2022-08-10 16:37:30,626] INFO Creating Kafka admin client (org.apache.kafka.connect.util.ConnectUtils)
[2022-08-10 16:37:30,634] INFO AdminClientConfig values:
bootstrap.servers = [172.18.0.3:9092]
client.dns.lookup = default
client.id =
connections.max.idle.ms = 300000
metadata.max.age.ms = 300000
metric.reporters = []
metrics.num.samples = 2
metrics.recording.level = INFO
metrics.sample.window.ms = 30000
receive.buffer.bytes = 65536
reconnect.backoff.max.ms = 1000
reconnect.backoff.ms = 50
request.timeout.ms = 120000
retries = 5
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
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
(org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'config.storage.topic' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'group.id' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'status.storage.topic' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'plugin.path' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'internal.key.converter.schemas.enable' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientC
onfig)
[2022-08-10 16:37:30,747] WARN The configuration 'kafka.consumer.group.id' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'internal.key.converter' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'offset.storage.file.filename' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,747] WARN The configuration 'internal.value.converter.schemas.enable' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClien
tConfig)
[2022-08-10 16:37:30,748] WARN The configuration 'internal.value.converter' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,748] WARN The configuration 'offset.storage.topic' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,749] WARN The configuration 'value.converter' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,749] WARN The configuration 'key.converter' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig)
[2022-08-10 16:37:30,750] INFO Kafka version: 5.4.1-ccs (org.apache.kafka.common.utils.AppInfoParser)
[2022-08-10 16:37:30,750] INFO Kafka commitId: fd1e543386b47352 (org.apache.kafka.common.utils.AppInfoParser)
[2022-08-10 16:37:30,751] INFO Kafka startTimeMs: 1660149450749 (org.apache.kafka.common.utils.AppInfoParser)
[2022-08-10 16:37:31,031] WARN [AdminClient clientId=adminclient-1] Connection to node 1 (/127.0.0.1:9092) could not be established. Broker may not be available. (org.apach
e.kafka.clients.NetworkClient)
