In a custom MapReduce job, what determines the number of Mappers that will be executed?
- Input Data Size
- Number of Partitions
- Number of Reducers
- Output Data Size
The number of Mappers in a custom MapReduce job is primarily determined by the size of the input data. Each input split is processed by a separate Mapper, and the total number of Mappers is influenced by the size of the input data and the configured input split size.
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