When setting up a Hadoop cluster, what is the primary role of the DataNode?
- Execute MapReduce jobs
- Manage the Namenode
- Store and manage actual data blocks
- Store and manage metadata
The primary role of a DataNode in Hadoop is to store and manage the actual data blocks. DataNodes are responsible for storing and retrieving data, and they communicate with the NameNode to report the health and availability of the data blocks they store.
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