Krisztian Kasa created HIVE-21948:
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             Summary: Implement parallell processing in Pre Upgrade Tool
                 Key: HIVE-21948
                 URL: https://issues.apache.org/jira/browse/HIVE-21948
             Project: Hive
          Issue Type: Improvement
          Components: Transactions
    Affects Versions: 3.1.0
            Reporter: Krisztian Kasa
            Assignee: Krisztian Kasa
             Fix For: 4.0.0


Pre Upgrade Tool scans for all databases and tables in the warehouse 
sequentially which can be very slow in case of lots of tables.

Example: It took the process 8-10 hours to complete on ~500k tables.



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