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

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.

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Does setting hive.mv.file.thread=0 reduce the performance of the insert query.Can you explain what does setting this configration has to do with HDP 2.5 upgrade