Divij Vaidya created KAFKA-14418:
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Summary: Add safety checks for modifying partitions of
__consumer_offsets
Key: KAFKA-14418
URL: https://issues.apache.org/jira/browse/KAFKA-14418
Project: Kafka
Issue Type: Improvement
Reporter: Divij Vaidya
Fix For: 3.4.0
Today a user can change the number of partitions of
{{{}__{}}}{{{}_consumer__{}}}{{{}offsets{}}} topic by changing the
configuration value for {{offsets.topic.num.partitions}} or manually by using
CreatePartition API.
Changing offsets of this reserved partition leads to problems with consumer
groups unless you restart all brokers. Thus, there is a high probability that
is this operations is not done right, users may shoot themselves in the foot.
Example scenario:
[https://stackoverflow.com/questions/73944561/kafka-consumer-group-coordinator-inconsistent]
To remedy this, I propose the following changes:
1. `kafka-topic.sh` should explicitly block adding new partitions to internal
topics
2. Add an operational guide to the docs for safely modifying partitions of
__consumer_offsets at [https://kafka.apache.org/documentation.html#basic_ops]
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