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There are seven stages to a MapReduce job: - Job setup - Load Split - Map - Copy - Merge - Reduce - Write part
There are seven stages to a MapReduce job:
Job setup Load Split Map Copy Merge Reduce Write part
Consider a scenario where there are mapping tasks each with a duration of seconds which yield intermediate keys to the reducer tasks. Each mapping task requires seconds to access its load split. The reducer tasks have a duration of seconds. Each reducer requires seconds to write information to HDFS The job setup time is seconds and copymerge stages have a duration of seconds. Assume the duration of the copymerge stages does not depend on the number of reducers. Consider a cluster of workers. You can assume that the ApplicationMaster is not on one of the workers ie does not use one of the containers for itself
Based on the information about the MapReduce job and the cluster described in the information above, what is the execution time of the load split and mapper tasks?
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