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Mapreduce mapper memory confirguration

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Mapreduce mapper memory confirguration

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Hi I did create one cluster. In that in the mapreduce configuration the default value of mapreduce.map.memory.mb is coming as 256 MB and mapreduce.map.java.opts is coming as -xmx410m. Although it specfied that values of mapreduce.map.java.opts should be less than the mapper memory. Then why it is coming more than mapreduce.map.java.opts ?