Specifies the minimum number of bytes that each input split should contain within a single rack. The default value is 0, meaning that there is no minimum size
Make sure not to concat orc files if they are generated by spark as there is a know issue HIVE-17403 and hence being disabled in later versions.
Example of this is a table/partition having 2 different files files (part-m-00000_1417075294718 and part-m-00018_1417075294718). Although both are completely different files, hive thinks these are files generated by separate instances of same task (because of failure or speculative execution). Hive will end up removing this file