#messaging

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• Scaling Slack’s job queue: Kafka in front of Redis

  Oct 4, 2026 7 min read

  Slack put Kafka in front of Redis so enqueue stays up when workers stall: durable buffering, Kafkagate, JQRelay rate limits, and incremental migration.

  • #distributed systems
  • #messaging
  • #kafka
  • #redis
  • #job queues