An analyst job reads a large HDFS dataset. Conceptually, how does the read path involve cluster roles?
Select an answer to reveal the explanation.
Short Explanation
Ask the librarian where the volumes live, then pull the books from the shelves—not from the librarian’s desk drawer. Metadata points; DataNodes deliver the bytes.
Full Explanation
In the conceptual HDFS read path, the client contacts the metadata service (NameNode) to learn block locations, then reads block contents directly from DataNodes. The NameNode is not the bulk data path. That separation keeps metadata operations lean while scaling throughput across many storage nodes.