Your cluster has the following characteristics: – A rack aware topology is configured and on –
Replication is set to 3 – Cluster block size is set to 64MB Which describes the file read
process when a client application connects into the cluster and requests a 50MB file?

A.
The client queries the NameNode for the locations of the block, and reads all three
copies. The first copy to complete transfer to the client is the one the client reads as part of
hadoop’s speculative execution framework.

B.
The client queries the NameNode which retrieves the block from the nearest DataNode
to the client then passes that block back to the client.

C.
The client queries the NameNode for the locations of the block, and reads from the first
location in the list it receives.

D.
The client queries the NameNode for the locations of the block, and reads from a random
location in the list it receives to eliminate network I/O loads by balancing which nodes it
retrieves data from any given time.