You want to scale your Hadoop cluster by adding 3 new nodes and safely remove 2 old nodes. Which sequence of actions is correct?

hard📝 Application Q15 of 15

Hadoop - Cluster Administration

AAdd new nodes, restart cluster, update exclude file

BAdd new nodes, update exclude file with old nodes, run <code>hdfs dfsadmin -refreshNodes</code>

CUpdate exclude file with old nodes, run <code>hdfs dfsadmin -refreshNodes</code>, add new nodes

DRemove old nodes physically, then add new nodes

Step-by-Step Solution

Solution:

Step 1: Decommission old nodes first
Update the exclude file with old nodes to remove and run refreshNodes to start decommissioning safely.
Step 2: Add new nodes after old nodes are decommissioned
Once old nodes are safely removed, add new nodes to scale the cluster.
Final Answer:
Update exclude file with old nodes, run hdfs dfsadmin -refreshNodes, add new nodes -> Option C
Quick Check:
Decommission old nodes before adding new ones [OK]

Quick Trick: Decommission old nodes before adding new ones [OK]

Common Mistakes:

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