wuchang created HIVE-20346:
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Summary: [Hive Upgrade] A rollback script is necessary when
upgrade hive
Key: HIVE-20346
URL: https://issues.apache.org/jira/browse/HIVE-20346
Project: Hive
Issue Type: Task
Reporter: wuchang
When we upgrade hive from a low version(1.1.0) to higher version(2.3.3), we
will have to:
# backup the old hive metastore database
# Use schema tool to upgrade the hive metastore database schema.
Then several days after the upgrading, new version hive have some critical
problems and we want to revert to previous hive, what could we do? Since during
these days the data in hive metastore has changed. So, if we directly switch to
the old hive metastore, any metadata changes after the upgrading will lose.
So , I think we need a rollback script, which is used to downgrade our high
version metastore schema to low version schema.
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