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Whether the version of Hadoop which is running supports sub-directories for tables/partitions. Many Hive optimizations can be applied if the Hadoop version supports sub-directories for tables/partitions. This support was added by MAPREDUCE-1501.

hive.mapred.mode

• Added In: Hive 0.3.0
• Default Value: nonstrict 
  Added In:
  • Hive 0.3
  .0
  • & later : nonstrict
  • Hive 1.x : nonstrict
  • Hive 2.x : strict (HIVE-12413)

  The mode in which the Hive operations are being performed. In strict mode, some risky queries are not allowed to run. For example, full table scans are prevented (see HIVE-10454) and ORDER BY requires a LIMIT clause.

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