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Aarif Lal Oommen
Asked: 2022-11-04T02:03:53+05:30 In:

Point out the wrong statement.

(a) Hadoop works better with a small number of large files than a large number of small files

(b) CombineFileInputFormat is designed to work well with small files

(c) CombineFileInputFormat does not compromise the speed at which it can process the input in a typical MapReduce job

(d) None of the mentioned

Point out the wrong statement.

(a) Hadoop works better with a small number of large files than a large number of small files

(b) CombineFileInputFormat is designed to work well with small files

(c) CombineFileInputFormat does not compromise the speed at which it can process the input in a typical MapReduce job

(d) None of the mentioned
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  1. The correct option is (c) CombineFileInputFormat does not compromise the speed at which it can process the input in a typical MapReduce job

    Easy explanation: If the file is very small (“small” means significantly smaller than an HDFS block) and there are a lot of them, then each map task will process very little input, and there will be a lot of them (one per file), each of which imposes extra bookkeeping overhead.

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