Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks
64MB. Identify which best 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
execution framework.
B.
The client queries the NameNode for the locations of the block, and reads from the first location
in the list of receives.
C.
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 at any given time.
D.
The client queries the NameNode and then retrieves the block from the nearest DataNode to
the client and then passes that block back to the client.
I think right answer is B. Because name node sends block locations in nearest distance order to client. First one is the nearest one. So client reads from first location. Client does not make any calculations on which one is nearest one.
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Right… B is right answer
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B is the right Answer.
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I have the same idea. D
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B is the right answer.Name node sends sorted list where block is stored with the nearest node at first.
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