Hadoop - Cluster Administration
After modifying the exclude file to decommission nodes in Hadoop, which command must be executed to apply these changes?
After modifying the exclude file to decommission nodes in Hadoop, which command must be executed to apply these changes?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the command to refresh nodes
After updating the exclude file, Hadoop does not automatically apply changes.Step 2: Use the refresh command
Runninghdfs dfsadmin -refreshNodesforces the NameNode to reload the exclude file and start decommissioning specified nodes.Final Answer:
hdfs dfsadmin -refreshNodes -> Option CQuick Check:
Command refreshes node list [OK]
Quick Trick: Run 'hdfs dfsadmin -refreshNodes' after exclude file update [OK]
Common Mistakes:
- Running 'hdfs namenode -format' which resets the cluster
- Using 'hadoop fs -ls /' which lists files only
- Running 'yarn node -list' which lists YARN nodes but doesn't refresh
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