How many Mappers run for a MapReduce job in Hadoop?
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When we submit a MapReduce job how many map tasks run in Hadoop?
How to calculate number of mappers in Hadoop?
How to set no of mappers for a MapReduce job?
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Number of Mappers in a MapReduce job depends upon the total number of InputSplits.
If you have 1GB of file that makes 8 blocks (of 128MB) so there will be only 8 mappers running on cluster.
Number of Mappers = Number of input splits.
Follow the link to learn more about: Mappers in Hadoop
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Number of Mappers is the count of the blocks present in a cluster
If you ask me number of mappers per node then my answer is , it lies between 10-100 and it varies with configuration of that particular node
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