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From "wuchang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20346) [Hive Upgrade] A rollback script is necessary when upgrade hive
Date Fri, 24 Aug 2018 00:58:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16591008#comment-16591008
] 

wuchang commented on HIVE-20346:
--------------------------------

[~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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