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What is a key characteristic of a disc node in a RabbitMQ cluster?

easy📝 Conceptual Q1 of 15
RabbitMQ - Clustering
What is a key characteristic of a disc node in a RabbitMQ cluster?
AIt cannot join a cluster with RAM nodes
BIt only keeps state in memory and loses it on restart
CIt stores its state on disk and recovers it after restart
DIt automatically replicates messages to all nodes
Step-by-Step Solution
Solution:

  1. Step 1: Understand disc node behavior

    Disc nodes save their state on disk, so they can recover after a restart.

  2. Step 2: Compare with RAM node behavior

    RAM nodes keep state only in memory and lose it if restarted, unlike disc nodes.

  3. Final Answer:

    It stores its state on disk and recovers it after restart -> Option C

  4. Quick Check:

    Disc node characteristic = stores state on disk [OK]
Quick Trick: Disc nodes save state on disk; RAM nodes do not [OK]
Common Mistakes:
MISTAKES
  • Confusing disc nodes with RAM nodes
  • Thinking disc nodes lose state on restart
  • Assuming disc nodes cannot cluster with RAM nodes

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