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A. FileSystem Counters

B. FileInputFormat Counters

C. FileOutputFormat counters

D. All of the above

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Correct Answer: File system Counters

Hadoop maintains built-in counters for every job that reports several metrics for each job. For example, there are built-in counters for the number of bytes and records processed, which helps to assure the expected amount of input was consumed and the expected amount of output was produced, etc.

Built-in counters are of three types:

  • Mapreduce Task Counters
  • File system counters
  • Job Counters

To understand built-in counters in Hadoop, you can join Hadoop Certification.

You can watch this YouTube tutorial on Hadoop to get started:

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