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CCA-410 · Question #49
CCA-410 Question #49: Real Exam Question with Answer & Explanation
The correct answer is A. The mapper stores the intermediate data on the underlying filesystem of the local disk of the machine. 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
Question
In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?
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.
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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