Hadoop - Cluster Administration
You updated the exclude file to remove a node but forgot to run
hdfs dfsadmin -refreshNodes. What is the likely result?You updated the exclude file to remove a node but forgot to run hdfs dfsadmin -refreshNodes. What is the likely result?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Understand refreshNodes role
The refreshNodes command tells the NameNode to reload the exclude file.Step 2: Consequence of not running refresh
If refreshNodes is not run, the NameNode does not know about the updated exclude file, so the node stays active.Final Answer:
The node remains active and is not decommissioned -> Option AQuick Check:
No refreshNodes = no decommission [OK]
Quick Trick: Always run refreshNodes after exclude file update [OK]
Common Mistakes:
- Assuming node decommissions automatically
- Thinking cluster shuts down
- Believing exclude file deletes itself
Master "Cluster Administration" in Hadoop
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