Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

The correct answer is C. The third Initial block will be 44 MB D. Two of the initial blocks will be 128MB E. Each block will be replicated three times F. The file will be split into three blocks when initially written into the cluster. Not A: The file will take (2x128 + 44) 3 = 900 MB C (not B): The third block size is 300 - 2 128 = 44 MB D (Not H): all blocks in a file except the last block are the same size. E (not G): All blocks are replicated three times by default.

Configuration

Question

Options

AThe file will consume 1152MB of space in the cluster
BThe third block will be 64MB
CThe third Initial block will be 44 MB
DTwo of the initial blocks will be 128MB
EEach block will be replicated three times
FThe file will be split into three blocks when initially written into the cluster
GEach block will be replicated nine times
HAll three blocks will be 128MB

How the community answered

(46 responses)

A
2% (1)
B
4% (2)
C
72% (33)
G
7% (3)
H
15% (7)

Explanation

Not A: The file will take (2x128 + 44) * 3 = 900 MB C (not B): The third block size is 300 - 2 * 128 = 44 MB D (Not H): all blocks in a file except the last block are the same size. E (not G): All blocks are replicated three times by default.

Topics

#HDFS block size#replication#file blocks#storage calculation

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