Kafka Avro Consumer (kafka-avro-console-consumer) Logging Level - apache-kafka

Question

Is there any way to turn off the "INFO" logging level in /usr/bin/kafka-avro-console-consumer?
Or, is there an alternate way to view data that is in an avro schema?
Right now I use the program (via Docker) and the output contains a large number of log messages (which I do not want) before it emits the data on the topic that I do want:
[2022-05-10 14:08:33,090] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$)
[2022-05-10 14:08:33,643] INFO ConsumerConfig values:
allow.auto.create.topics = true
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [kafka:9092]
check.crcs = true
client.dns.lookup = use_all_dns_ips
client.id = consumer-console-consumer-25832-1
client.rack =
connections.max.idle.ms = 540000
default.api.timeout.ms = 60000
enable.auto.commit = false
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = console-consumer-25832
group.instance.id = null
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
internal.throw.on.fetch.stable.offset.unsupported = false
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 30000
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
session.timeout.ms = 10000
socket.connection.setup.timeout.max.ms = 30000
socket.connection.setup.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.3]
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 = TLSv1.3
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
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
(org.apache.kafka.clients.consumer.ConsumerConfig)
[2022-05-10 14:08:33,809] INFO Kafka version: 6.2.0-ce (org.apache.kafka.common.utils.AppInfoParser)
[2022-05-10 14:08:33,809] INFO Kafka commitId: 5c753752ae1445a1 (org.apache.kafka.common.utils.AppInfoParser)
[2022-05-10 14:08:33,809] INFO Kafka startTimeMs: 1652191713801 (org.apache.kafka.common.utils.AppInfoParser)
[2022-05-10 14:08:33,814] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Subscribed to topic(s): dbserver1.public.x_account (org.apache.kafka.clients.consumer.KafkaConsumer)
[2022-05-10 14:08:34,471] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Cluster ID: 9-BvG22VQrimBsWAceE02Q (org.apache.kafka.clients.Metadata)
[2022-05-10 14:08:34,473] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Discovered group coordinator kafka:9092 (id: 2147483646 rack: null) (org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
[2022-05-10 14:08:34,477] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] (Re-)joining group (org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
[2022-05-10 14:08:34,501] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] (Re-)joining group (org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
[2022-05-10 14:08:34,507] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Successfully joined group with generation Generation{generationId=1, memberId='consumer-console-consumer-25832-1-d482e04b-8ed0-4d68-b533-a010dde3c99a', protocol='range'} (org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
[2022-05-10 14:08:34,511] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Finished assignment for group at generation 1: {consumer-console-consumer-25832-1-d482e04b-8ed0-4d68-b533-a010dde3c99a=Assignment(partitions=[dbserver1.public.x_account-0])} (org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
[2022-05-10 14:08:34,524] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Successfully synced group in generation Generation{generationId=1, memberId='consumer-console-consumer-25832-1-d482e04b-8ed0-4d68-b533-a010dde3c99a', protocol='range'} (org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
[2022-05-10 14:08:34,525] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Notifying assignor about the new Assignment(partitions=[dbserver1.public.x_account-0]) (org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
[2022-05-10 14:08:34,529] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Adding newly assigned partitions: dbserver1.public.x_account-0 (org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
[2022-05-10 14:08:34,540] INFO [Consumer clientId=consumer-console-consumer-25832-1, groupId=console-consumer-25832] Found no committed offset for partition dbserver1.public.x_account-0 (org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
The command that generates the above output is provided below:
docker exec -i [schema-registry-container] /usr/bin/kafka-avro-console-consumer \
--bootstrap-server kafka:9092 \
--topic [some-topic] \
--from-beginning \
--property schema.registry.url="http://schema-registry:8081"

Answer 1

For the Confluent Schema Registry image, you can add this env-var for completely disabling any consumer package logs
SCHEMA_REGISTRY_LOG4J_LOGGERS="org.apache.kafka.clients.consumer=OFF"
Comma-separate more packages to further configure log4j
alternate way to view data that is in an avro schema
kcat or tools like AKHQ, Conduktor, etc.