A customer's nightly EMR job processes a single 2-TB data file stored on Amazon Simple Storage Service (S3). The EMR job runs on two On-Demand core nodes and three On-Demand task nodes. Which of the following may help reduce the EMR job completion time?
A. Use three Spot Instances rather than three On-Demand instances for the task nodes.
B. Change the input split size in the MapReduce job configuration.
C. Use a bootstrap action to present the S3 bucket as a local filesystem.
D. Launch the core nodes and task nodes within an Amazon Virtual Cloud.
E. Adjust the number of simultaneous mapper tasks.
F. Enable termination protection for the job flow.
Answer:
B. Change the input split size in the MapReduce job configuration.
E. Adjust the number of simultaneous mapper tasks.
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