Getting message '(Re-)joining group' every 5 seconds

[Caroline Even <ca...@gmail.com>]

Hi,

I am writing a service consuming messages with Kafka, and I sometimes notice
the following INFO log:

[Consumer clientId=consumer-1, groupId=my_group] (Re-)joining group

After a deployment of my service, this message was logged every 5 seconds,
until I re-deployed the service which seemed to magically fix the problem.

This is my config:

auto.commit.interval.ms = 1000

auto.offset.reset = earliest

check.crcs = true

client.id =

connections.max.idle.ms = 540000

enable.auto.commit = true

exclude.internal.topics = true

fetch.max.bytes = 52428800

fetch.max.wait.ms = 500

fetch.min.bytes = 1

heartbeat.interval.ms = 3000

interceptor.classes = null

internal.leave.group.on.close = true

isolation.level = read_uncommitted

key.deserializer = class
org.apache.kafka.common.serialization.StringDeserializer

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 = 305000

retry.backoff.ms = 100

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.mechanism = GSSAPI

security.protocol = PLAINTEXT

send.buffer.bytes = 131072

session.timeout.ms = 30000

ssl.cipher.suites = null

ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]

ssl.endpoint.identification.algorithm = null

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

value.deserializer = class
org.apache.kafka.common.serialization.BytesDeserializer


Do you know what could cause the issue, and why was the message logged
every 5 seconds?

Thanks,

Caroline