[Solved] What happens to data blocks on a Hadoop node when it is decommissioned? — Ans: Data blocks are replicated to other active nodes before decommissioning... | Hadoop

Hadoop - Cluster Administration

What happens to data blocks on a Hadoop node when it is decommissioned?

AData blocks are deleted immediately from the node

BData blocks are replicated to other active nodes before decommissioning completes

CData blocks remain only on the decommissioned node

DData blocks are moved to the NameNode

Step-by-Step Solution

Solution:

Step 1: Understand node decommissioning process
When a node is decommissioned, Hadoop replicates its data blocks to other nodes to maintain data availability.
Step 2: Identify what happens to data blocks
Data blocks are copied to other nodes before the node is removed from the cluster to avoid data loss.
Final Answer:
Data blocks are replicated to other active nodes before decommissioning completes -> Option B
Quick Check:
Node decommissioning = Data replication before removal [OK]

Quick Trick: Decommissioning copies data before node removal [OK]

Common Mistakes:

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What happens to data blocks on a Hadoop node when it is decommissioned?