In a Hadoop cluster, what is the primary role of DataNodes?
- Coordinate resource allocation
- Execute MapReduce jobs
- Manage metadata
- Store and manage data blocks
The primary role of DataNodes in a Hadoop cluster is to store and manage data blocks. They are responsible for storing the actual data and are distributed across the cluster to ensure fault tolerance and parallel data processing. DataNodes report to the NameNode about the health and status of the data blocks they store.
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