Eugene Koifman created HIVE-18444:
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             Summary: when creating transactional table make sure location has 
no data
                 Key: HIVE-18444
                 URL: https://issues.apache.org/jira/browse/HIVE-18444
             Project: Hive
          Issue Type: Bug
          Components: Transactions
    Affects Versions: 1.0.0
            Reporter: Eugene Koifman


if a user creates a new transactional table but sets a location to some place 
that already has data any number of things can break.  

Data may not be in Acid format, it may have been written by another cluster and 
txnids won't make sense in current cluster.  Once per table writeIDs are there, 
if the data was written by another table, writeIDs won't match.

This could actually work if the data at the existing location was not written 
by an acid write but it would be safer/cleaner to just prevent this (at least 
at first).



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