The default hive.input.format is set to This configuration could give less number of mappers than the split size (i.e., # blocks in HDFS) of the input table.

Try setting for hive.input.format.


Note Apache Tez uses by the default.

set hive.tez.input.format;

You can then control the maximum number of mappers via setting:

set mapreduce.job.maps=128;

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