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Table 1 Number of mappers for the different block sizes

From: Positive and negative association rule mining in Hadoop’s MapReduce environment

Block size # of mappers (1.5 GB) # of mappers (6 GB) # of mappers (12 GB) # of mappers (18 GB)
32 MB 45 177 354 530
64 MB 22 89 178 265
128 MB 11 45 89 133
256 MB 6 22 45 67