In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?

Question

Options

• AThe mapper stores the intermediate data on the underlying filesystem of the local disk of the machine
• BThe mapper transfers the intermediate data to the jobtracker, which then sends it to the reducers
• CThe hadoop framework holds the intermediate data in the task trackers memory until it is transferred to
• DThe mapper transfer the intermediate data immediately to the reducers as it is generated by map task.

• A
  79% (19)
• B
  4% (1)
• C
  4% (1)
• D
  13% (3)

Explanation

mapreduce.cluster.local.dir The local directory where MapReduce stores intermediate data files. May be a comma-separated list of directories on different devices in order to spread disk i/o. Directories that do not exist are

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