SOLVED: Consider a scenario where a client is reading a big data file from HDFS. Which ...

Consider a scenario where a client is reading a big data file from HDFS. Which of the following denotes the correct sequence of this read operation?

The client queries the NameNode for the block location(s). The NameNode returns the block location(s) to the client. The client reads the data directly off the DataNode(s).

The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly off the DataNode.

The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The NameNode reads data from the DataNodes and passes it to the client.

The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.

Verified Answer

Correct Option - a

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