HDP 2.5.3 : Hive Throws ConcurrentModificationException When Executing Insert Overwrite Table

bug (HIVE-15355) is being worked on by Hive engineering team at Hortonworks

You can use the following workaround :

1- use "SORT BY 0" at the end of the query which will force to use one reducer , please use this only if you have a small query.

2- try to use set hive.mv.files.thread=0; before running the query.

If you have any question regarding the above, please let me know.