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This repository has been archived by the owner on Oct 8, 2019. It is now read-only.
The default hive.input.format is set to org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.
This configuration could give less number of mappers than the split size (i.e., # blocks in HDFS) of the input table.
Try setting org.apache.hadoop.hive.ql.io.HiveInputFormat for hive.input.format.
set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;
Note Apache Tez uses org.apache.hadoop.hive.ql.io.HiveInputFormat by the default.