When is the reduce method first called in a MapReduce job?

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Options

• AReduce methods and map methods all start at the beginning of a job, in order to provide
• BReducers start copying intermediate key value pairs from each Mapper as soon as it has
• CReducers start copying intermediate key-value pairs from each Mapper as soon as it has
• DReducers start copying intermediate key-value pairs from each Mapper as soon as it has

• A
  13% (5)
• B
  10% (4)
• C
  72% (28)
• D
  5% (2)

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