Kafka Failed to Acquire Lock on File .lock: How to Fix It
Kafka broker won't start: 'Failed to acquire lock on file .lock ... A Kafka instance in another process is using this directory.' Why it happens and how to fix it.
kraft
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Kafka InconsistentClusterIdException: Cluster ID Mismatch Fix
Fix kafka.common.InconsistentClusterIdException: Cluster ID doesn't match stored clusterId in meta.properties — the Docker volume cause and the real fix.
Kafka NotControllerException: Why It Happens and How to Fix It
Kafka throws NotControllerException (code 41) when an admin request hits a broker that isn't the active controller. Here's the mechanism and the real fix.
Kafka InvalidReplicationFactorException: Larger Than Available Brokers
Fix Kafka's InvalidReplicationFactorException — "Replication factor: 3 larger than available brokers: 1" — in Docker and single-broker dev setups fast.
Kafka ListenerNotFoundException: No Matching Listener Fix
Kafka ListenerNotFoundException and 'leader brokers without a matching listener' explained: why the leader lacks the listener, how to reproduce, and the fix.