[HIVE-21739] Make metastore DB backward compatible with pre-catalog versions of hive.

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.0, 2.1.1
• Fix Version/s: 4.0.0-alpha-1
• Assignee: Aditya Shah
• Reporter: Aditya Shah
• Created: 16/May/19 12:11
• Updated: 17/Nov/22 08:51
• Resolved: 28/May/19 20:31

Description

Since the addition of foreign key constraint between Database ('DBS') table and catalogs ('CTLGS') table in HIVE-18755 we are unable 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: 

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"))