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.
Java
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Kafka LEADER_NOT_AVAILABLE: Why It Happens and How to Fix It
Kafka LEADER_NOT_AVAILABLE floods your producer logs the moment you write to a fresh topic. Here's the exact cause, the reproduction, and the real fix.
KafkaStorageException: Disk Error & No Space Left on Device
Fix org.apache.kafka.common.errors.KafkaStorageException and 'No space left on device' broker shutdowns — recovery runbook, retention math, disk sizing.
Kafka InvalidTxnStateException: Causes and How to Fix It
InvalidTxnStateException means your producer called a transactional API in the wrong state. Here's the state machine, the exact triggers, and the fix.
Kafka InvalidTopicException: Why It Happens and How to Fix It
Kafka InvalidTopicException — 'Topic name is illegal' from bad characters, 249-char limits, or '.'/'_' collisions. The exact rules, root cause, and the fix.
Kafka InvalidStateStoreException: State Store May Have Migrated
Fixing InvalidStateStoreException: "the state store may have migrated to another instance" in Kafka Streams — root causes, retry logic, and the right IQ design.
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 InvalidGroupIdException: Fixing the group.id Error
Hitting InvalidGroupIdException: "you must provide a valid group.id"? Why subscribe() and offset commits require a group.id in Kafka, and the exact fix.
Kafka InstanceAlreadyExistsException: AppInfo Mbean Fix
Kafka logs 'Error registering AppInfo mbean javax.management.InstanceAlreadyExistsException'. Here's what a duplicate client.id really breaks and how to fix it.
Kafka InitProducerId Timeout: Why It Hangs and the Fix
Kafka producer throws 'Timeout expired after 60000ms while awaiting InitProducerId' and initTransactions() hangs on startup. Here's the real root cause and the fix.