org.apache.kafka.common.errors.GroupAuthorizationException: Not authorized to access group: XXX

The other day my team ran into below issue. I did debugging to help them resolve this. The error was straight forward, issue with Authorization ie ACL (Access Control List) are not correctly setup.

[shri@xxxxx config]# /opt/kafka_2.11-0.10.1.1/bin/kafka-console-consumer.sh –bootstrap-server xxxxx:9093 —topic topic1 –consumer.config /opt/kafka_2.11-0.10.1.1/config/consumer-ssl.properties –from-beginning
[2017-06-08 23:06:15,290] WARN Error while fetching metadata with correlation id 1 : {topic1=UNKNOWN_TOPIC_OR_PARTITION} (org.apache.kafka.clients.NetworkClient)
[2017-06-08 23:06:15,292] ERROR Unknown error when running consumer: (kafka.tools.ConsoleConsumer$)
org.apache.kafka.common.errors.GroupAuthorizationException: Not authorized to access group: group1

The way to debug issue,

1. List the ACL for the topic ie topic1 and consumer group ie group1

Current ACLs for resource `Topic:topic1`:
User:CN=consumer.shri.com,OU=IT,O=XXX,L=Austin,ST=TX,C=US has Allow permission for operations: Describe from hosts: *
User:CN=producer.shri.com,OU=IT,O=XXX,L=Austin,ST=TX,C=US has Allow permission for operations: Describe from hosts: *
User:CN=consumer.shri.com,OU=IT,O=XXX,L=Austin,ST=TX,C=US has Allow permission for operations: Read from hosts: *
User:CN=producer.shri.com,OU=IT,O=XXX,L=Austin,ST=TX,C=US has Allow permission for operations: Write from hosts: *

Current ACLs for resource `Group:group1`:
User:CN=consumer.shri.com,OU=IT,O=XXX,L=Dallas,ST=TX,C=US has Allow permission for operations: Read from hosts: *

2. List the certificate (keystore) being used by the consumer. As you can see there is minor difference in ACL setup for topic and group and cert being used by the consumer. ACL had location as Austin, while cert had location as Atlanta. We change cert to match what was in the ACL, that resolve the error.

The JKS subject is
[spatel@xxxxx config]# keytool -v -list -keystore test.jks
Certificate[1]:
Owner: CN=consumer.shri.com, OU=IT, O=XXX Inc., L=Atlanta, ST=TX, C=US

So its simple setup issue, make sure all the configuration and setup line up correctly.

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