Kafka Streams RocksDBException: Too Many Open Files Fix
Kafka Streams dying with ProcessorStateException and RocksDBException 'Too many open files'? Here's the file-descriptor math and the config setter that fixes it.
event-streaming
29 PostsKafkaStorageException: 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 Streams MissingSourceTopicException: Fix It Fast
Kafka Streams dies with MissingSourceTopicException on startup or rebalance. Here's why the assignor flags a missing source topic and how to fix it.
Kafka FETCH_SESSION_ID_NOT_FOUND: Causes and Fix
Kafka logs spamming FETCH_SESSION_ID_NOT_FOUND or INVALID_FETCH_SESSION_EPOCH? Here's what the fetch session cache is doing and how to stop the noise.
Kafka SerializationException: Schema Not Found (40403) Fix
Kafka consumer dies with SerializationException: Error retrieving Avro schema for id N, Schema not found; error code: 40403. Why the ID lookup fails and how to fix it.
Kafka RetriableCommitFailedException: Causes and Fix
Kafka RetriableCommitFailedException on offset commit means a transient commit failure you must retry yourself. Here's what triggers it and how to handle it correctly.
Kafka Streams Deserialization Exception Handler: Fix the Fail
Kafka Streams dies with 'Deserialization exception handler is set to fail upon a deserialization error.' Here's why one bad record kills the thread and how to fix it.
Kafka NotLeaderOrFollowerException: Cause and Fix
Producer or consumer failing with NotLeaderOrFollowerException (NOT_LEADER_OR_FOLLOWER)? Why stale leader metadata causes it and how to fix it for good.
Kafka RebalanceInProgressException: Why It Happens and How to Fix It
Kafka RebalanceInProgressException on commitSync/commitAsync with CooperativeStickyAssignor? Here's why it's not CommitFailedException, and the correct fix.
Fix KafkaConsumer Is Not Safe for Multi-Threaded Access
Hitting ConcurrentModificationException: KafkaConsumer is not safe for multi-threaded access? Here's why the thread guard fires and the correct fix.