Given the following RabbitMQ memory watermark setting: {rabbit, [{vm_memory_high_watermark, 0.3}]}, what happens when memory usage reaches 35%?

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RabbitMQ - Performance Tuning

Given the following RabbitMQ memory watermark setting: {rabbit, [{vm_memory_high_watermark, 0.3}]}, what happens when memory usage reaches 35%?

AMessages are automatically deleted

BFlow control remains inactive

CRabbitMQ crashes due to memory overflow

DFlow control activates and blocks publishers

Step-by-Step Solution

Solution:

Step 1: Understand watermark threshold
The vm_memory_high_watermark is set to 0.3, meaning 30% memory usage triggers flow control.
Step 2: Analyze memory usage at 35%
Since 35% exceeds 30%, flow control activates to block publishers and prevent overload.
Final Answer:
Flow control activates and blocks publishers -> Option D
Quick Check:
Memory > watermark triggers flow control = A [OK]

Quick Trick: Flow control triggers when usage exceeds watermark [OK]

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