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https://issues.apache.org/jira/browse/HIVE-3764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15090494#comment-15090494
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Lefty Leverenz commented on HIVE-3764:
--------------------------------------
Doc note: This adds two configuration parameters to HiveConf.java in 0.12.0.
They're documented in the wiki here:
* [Configuration Properties -- datanucleus.fixedDatastore |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-datanucleus.fixedDatastore]
* [Configuration Properties -- hive.metastore.schema.verification |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.metastore.schema.verification]
Their default values are changed in release 2.0.0 by HIVE-1841 and HIVE-12436,
respectively.
> Support metastore version consistency check
> -------------------------------------------
>
> Key: HIVE-3764
> URL: https://issues.apache.org/jira/browse/HIVE-3764
> Project: Hive
> Issue Type: Improvement
> Components: Metastore
> Affects Versions: 0.8.0, 0.9.0, 0.10.0, 0.11.0
> Reporter: Prasad Mujumdar
> Assignee: Prasad Mujumdar
> Fix For: 0.12.0
>
> Attachments: HIVE-3764-12.3.patch, HIVE-3764-trunk.3.patch,
> HIVE-3764.1.patch, HIVE-3764.2.patch
>
>
> Today there's no version/compatibility information stored in hive metastore.
> Also the datanucleus configuration property to automatically create missing
> tables is enabled by default. If you happen to start an older or newer hive
> or don't run the correct upgrade scripts during migration, the metastore
> would end up corrupted. The autoCreate schema is not always sufficient to
> upgrade metastore when migrating to newer release. It's not supported with
> all databases. Besides the migration often involves altering existing table,
> changing or moving data etc.
> Hence it's very useful to have some consistency check to make sure that hive
> is using correct metastore and for production systems the schema is not
> automatically by running hive.
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