I\'ve basic understanding on what Pig, Hive abstractions are. But I don\'t have a clear idea on the scenarios that require Hive, Pig or native map reduce.
All the things which we can do using PIG and HIVE can be achieved using MR (sometimes it will be time consuming though). PIG and HIVE uses MR/SPARK/TEZ underneath. So all the things which MR can do may or may not be possible in Hive and PIG.