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Why does RabbitMQ use absolute byte values for disk_free_limit and vm_memory_high_watermark.absolute instead of percentages?

hard📝 Conceptual Q10 of 15
RabbitMQ - Performance Tuning
Why does RabbitMQ use absolute byte values for disk_free_limit and vm_memory_high_watermark.absolute instead of percentages?
AAbsolute values are easier to configure in the management UI
BAbsolute values provide precise control regardless of total resource size
CPercentages cause alarms to never trigger
DPercentages are not supported by Erlang VM
Step-by-Step Solution
Solution:

  1. Step 1: Understand configuration design

    Absolute byte values allow consistent thresholds regardless of total memory or disk size.

  2. Step 2: Identify why percentages are avoided

    Percentages could vary with hardware changes; absolute values give precise control.

  3. Final Answer:

    Absolute values provide precise control regardless of total resource size -> Option B

  4. Quick Check:

    Absolute values = precise control [OK]
Quick Trick: Absolute bytes ensure consistent alarm thresholds [OK]
Common Mistakes:
MISTAKES
  • Assuming Erlang VM lacks percentage support
  • Thinking percentages never trigger alarms

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