Message Queues & Streaming.

Asynchronous messaging, event streaming, and pub/sub patterns. Covers 8 topics.

• Message Queues & Streaming · 1 of 3

  Stream Processing Patterns

  What is Redis Streams' message ID format?

  AA sequential integer counting up from zeroBA content hash used to spot duplicate stream entriesCA UUID the Redis server assigns at write timeDA millisecond timestamp joined to a sequence number

• Message Queues & Streaming · 2 of 3

  RabbitMQ & AMQP

  In RabbitMQ topic exchanges, what does the wildcard '#' match?

  AZero or more dot-separated wordsBOne or more consecutive charactersCExactly one dot-separated wordDA single character position

• Message Queues & Streaming · 3 of 3

  Apache Kafka

  A multi-tenant Kafka 3.x cluster in ZooKeeper mode serves 200 teams, and each team creates topics freely. The cluster now holds 300,000 partitions, and each controller failover takes many minutes. What is the root cause?

  AInter-broker replication saturates the network, so the controller's heartbeats time out during failoverBSchema Registry keeps a version for every topic, so the controller must replay all schema versions on failoverCEach partition adds metadata that a newly elected controller must load and send to every brokerDConsumer group IDs collide between teams, so group rebalances hold the controller lock during failover