Aditya Shah created HIVE-21739:
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             Summary: Make metastore DB backward compatible with pre-catalog 
versions of hive.
                 Key: HIVE-21739
                 URL: https://issues.apache.org/jira/browse/HIVE-21739
             Project: Hive
          Issue Type: Sub-task
    Affects Versions: 2.1.1, 1.2.0
            Reporter: Aditya Shah
            Assignee: Aditya Shah


Since the addition of foreign key constraint between Database ('DBS') table and 
catalogs ('CTLGS') table in HIVE-18755 we are able to run a simple create 
database command with an older version of Metastore Server. This is due to 
older versions having JDO schema as per older schema of 'DBS' which did not 
have an additional 'CTLG_NAME' column.

The error is as follows: 
{code:java}
org.apache.hadoop.hive.ql.metadata.HiveException: 
MetaException(message:Exception thrown flushing changes to datastore)
....
java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key 
constraint fails ("metastore_1238"."DBS", CONSTRAINT "CTLG_FK1" FOREIGN KEY 
("CTLG_NAME") REFERENCES "CTLGS" ("NAME"))
{code}



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