GCP PubSub Subscription Lag
GCP PubSub subscription accumulates backlog when subscriber throughput is insufficient.
Category archive
Messaging fixes
Published troubleshooting guides for messaging issues.
NATS Core Cluster Route Link Down
NATS cluster routes disconnect when network partition separates nodes.
ZeroMQ Curve Key Mismatch
ZeroMQ CURVE encryption fails when server public key does not match.
ZeroMQ High Water Mark Reached
ZeroMQ drops messages when socket HWM is reached and Conflate is not set.
Apache Artemis Security Role Missing
Artemis security denies access when role permissions are not defined.
Apache Artemis Paging Store Full
Artemis paging store fills disk when address full policy is page.
Apache Artemis Broker Cluster Connection
Artemis cluster connections fail when bridge configuration is wrong.
SQS FIFO Deduplication Not Working
SQS FIFO queue deduplication fails when content-based dedup is disabled.
SNS Topic Not Delivering
SNS topic does not deliver to subscribers when endpoint is invalid.
SQS DLQ Not Receiving
SQS dead letter queue does not receive messages when redrive policy is wrong.
SQS Consumer Polling Rate Limit
SQS consumers hit API rate limit when polling frequency is too high.
SQS Queue Policy Denied
SQS SendMessage fails when queue policy denies principal access.
NATS Subscription Permission Denied
NATS clients cannot subscribe when authorization token is invalid.
NATS JetStream Storage Limit
NATS JetStream rejects messages when account storage limit is reached.
NATS Streaming Cluster Not Forming
NATS Streaming cluster does not form when RAFT consensus cannot be reached.
Pulsar Dispatcher Consumer Unavailable
Pulsar message dispatcher cannot deliver when consumers are disconnected.
Pulsar Backlog Quota Exceeded
Pulsar producers are blocked when topic backlog exceeds quota.
Pulsar Topic Bundle Unload Failed
Pulsar topic bundles cannot be unloaded when broker is overloaded.
Pulsar Broker Unavailable
Pulsar brokers are unavailable when Zookeeper metadata is inconsistent.
Redis Stream Consumer Group No Ack
Redis stream entries remain pending when consumers do not send XACK.
ActiveMQ Kaha PIndex Corrupted
ActiveMQ KahaDB index is corrupted after unclean shutdown.
ActiveMQ JDBC Lock Expired
ActiveMQ loses database lock when lease period expires without renewal.
ActiveMQ Slow Consumer
ActiveMQ marks consumers as slow when prefetch is not consumed in time.
ActiveMQ Destination Full
ActiveMQ producers block when destination is full and policy blocks producers.
ActiveMQ Master Slave Failover
ActiveMQ failover does not work when shared storage is not accessible.
Kafka ACL Authorization Failed
Kafka clients are denied access when ACL policies do not permit operations.
Kafka Cruise Control Rebalance Failed
Kafka Cruise Control cannot rebalance when proposed movements exceed capacity.
Kafka MirrorMaker Lag
Kafka MirrorMaker falls behind when source cluster throughput exceeds replication capacity.
Kafka ksqlDB Query Not Returning
Kafka ksqlDB queries return no results when stream or table is not properly defined.
Kafka Connect Connector Failed
Kafka Connect connector tasks fail when source or sink is unreachable.
Kafka Schema Registry Incompatible
Kafka Schema Registry rejects messages when schema compatibility check fails.
Kafka Log Segment Deletion Failed
Kafka cannot delete old log segments when retention policy is blocked.
Kafka Consumer Rebalance Failed
Kafka consumer group rebalance fails when coordinator is unavailable.
Kafka Producer Batch Full Timeout
Kafka producer batches timeout when broker acknowledgment is not received.
Kafka Offset Out of Range
Kafka consumer requests offset that is no longer available due to retention.
Kafka No Leader for Partition
Kafka partition has no leader when all ISR replicas are unavailable.
Kafka Under Replicated Partitions
Kafka partitions are under-replicated when broker replicas are offline.
Kafka Zookeeper Session Expired
Kafka broker loses Zookeeper session when heartbeat timeout is exceeded.
Kafka Broker Not Starting
Kafka broker fails to start when Zookeeper is unreachable or log dirs are full.
Kafka Consumer Lag Growing
Kafka consumer lag grows when consumption rate is slower than production rate.
RabbitMQ Persistent Queue Not Durable
RabbitMQ messages are lost after restart when queue is not durable.
RabbitMQ TTL Expiration Not Working
RabbitMQ message TTL does not expire messages when queue has no consumers.
RabbitMQ DLX Not Delivering
RabbitMQ dead letter exchange does not receive messages when DLX configuration is wrong.
RabbitMQ Consumer Cancel Notification
RabbitMQ consumers are cancelled when queue is deleted or mirrored queue loses master.
RabbitMQ Federation Link Down
RabbitMQ federation link is down when upstream server is unavailable.
RabbitMQ Shovel Not Forwarding
RabbitMQ shovel plugin does not forward messages when destination is unreachable.
RabbitMQ Mirror Queue Sync Stuck
RabbitMQ mirrored queue synchronization is stuck when network is slow or queue is large.
RabbitMQ Partition Handling
RabbitMQ network partitions cause split-brain when cluster nodes lose connectivity.
RabbitMQ Memory High Watermark
RabbitMQ blocks publishers when memory usage exceeds high watermark threshold.
RabbitMQ Queue Not Consuming
RabbitMQ messages accumulate when consumers are disconnected or prefetch limits are reached.