Hadoop - Cluster Administration
You notice that Ambari shows a service as 'UNKNOWN'. What is the most likely cause?
You notice that Ambari shows a service as 'UNKNOWN'. What is the most likely cause?
medium📝 Troubleshoot Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand 'UNKNOWN' status meaning
'UNKNOWN' means Ambari cannot get status, often due to lost connection to agent.Step 2: Check other options
Normal running shows GREEN, stopped intentionally shows INSTALLED or STOPPED, high CPU does not cause UNKNOWN.Final Answer:
Ambari server lost connection to the agent -> Option CQuick Check:
UNKNOWN status = lost agent connection [OK]
Quick Trick: UNKNOWN means Ambari can't reach the agent [OK]
Common Mistakes:
- Thinking UNKNOWN means service stopped
- Confusing high CPU with UNKNOWN status
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