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CCA-410 · Question #78
CCA-410 Question #78: Real Exam Question with Answer & Explanation
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Question
How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)
Options
- ADataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
- BDataNodes heartbeat in the master on a regular basis.
- CThe NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
- DThe NameNode send a broadcast across the network when it first starts, and DataNodes respond.
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