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You try to read a Kafka JMX metric but get a javax.management.InstanceNotFoundException. What is the most likely cause?

medium📝 Debug Q14 of Q15
Kafka - Monitoring and Operations
You try to read a Kafka JMX metric but get a javax.management.InstanceNotFoundException. What is the most likely cause?
AThe ObjectName used does not match any registered MBean
BThe Kafka broker is down
CThe attribute name is misspelled
DThe MBeanServer is not initialized
Step-by-Step Solution
Solution:

  1. Step 1: Understand the exception meaning

    InstanceNotFoundException means the requested MBean ObjectName is not found in the MBeanServer.

  2. Step 2: Identify the cause

    If the ObjectName does not match any registered MBean, this exception occurs.

  3. Final Answer:

    The ObjectName used does not match any registered MBean -> Option A

  4. Quick Check:

    InstanceNotFoundException = Wrong ObjectName [OK]
Quick Trick: Check ObjectName spelling if InstanceNotFoundException occurs [OK]
Common Mistakes:
MISTAKES
  • Blaming attribute name for InstanceNotFoundException
  • Assuming broker down causes this exception
  • Thinking MBeanServer is uninitialized

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