Hadoop - Cluster Administration
An admin tries to decommission a node but the exclude file has a typo in the hostname. What is the expected behavior?
An admin tries to decommission a node but the exclude file has a typo in the hostname. What is the expected behavior?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand exclude file matching
The exclude file must list exact hostnames to mark nodes for decommissioning.Step 2: Effect of typo in hostname
If the hostname is incorrect, the node is not recognized for decommissioning and remains active.Final Answer:
The node will not be decommissioned because it is not correctly listed -> Option AQuick Check:
Typo in exclude file = Node not decommissioned [OK]
Quick Trick: Exclude file hostnames must be exact [OK]
Common Mistakes:
- Assuming node decommissions despite typo
- Thinking cluster shuts down on typo
- Believing NameNode ignores exclude file
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