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https://issues.apache.org/jira/browse/HIVE-20346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16591008#comment-16591008
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wuchang commented on HIVE-20346:
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[~alangates] [~thejas] [~vgarg] [~sershe] , would you please give me some
suggestions?
> [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
> Assignee: wuchang
> Priority: Major
>
> 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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