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Why does RabbitMQ recommend having at least one disc node in a cluster?

hard📝 Conceptual Q10 of 15
RabbitMQ - Clustering
Why does RabbitMQ recommend having at least one disc node in a cluster?
ATo speed up message delivery across the cluster
BTo automatically balance load between nodes
CTo prevent RAM nodes from joining the cluster
DTo ensure cluster state is durable and recoverable after restarts
Step-by-Step Solution
Solution:

  1. Step 1: Understand disc node purpose

    Disc nodes save cluster state on disk, making it durable and recoverable.

  2. Step 2: Contrast with other options

    Disc nodes do not speed delivery, prevent RAM nodes, or balance load automatically.

  3. Final Answer:

    To ensure cluster state is durable and recoverable after restarts -> Option D

  4. Quick Check:

    Disc node ensures durability and recovery [OK]
Quick Trick: Disc nodes keep cluster state safe on disk [OK]
Common Mistakes:
MISTAKES
  • Thinking disc nodes speed up delivery
  • Believing disc nodes block RAM nodes
  • Assuming disc nodes balance load automatically

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