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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1841) datanucleus.fixedDatastore should be true in hive-default.xml
Date Thu, 12 Nov 2015 21:38:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002976#comment-15002976
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Ashutosh Chauhan commented on HIVE-1841:
----------------------------------------

Now we have schemaTool which automates schema creation process. We can document that as step
in installation guide.

Given that Hive is now used in lot of production scenario and metasore being used by components
outside of Hive, we need to make defaults favor production scenarios rather than for beginners.

>  datanucleus.fixedDatastore should be true in hive-default.xml
> --------------------------------------------------------------
>
>                 Key: HIVE-1841
>                 URL: https://issues.apache.org/jira/browse/HIVE-1841
>             Project: Hive
>          Issue Type: Improvement
>          Components: Configuration, Metastore
>    Affects Versions: 0.6.0
>            Reporter: Edward Capriolo
>            Priority: Minor
>         Attachments: HIVE-1841.1.patch.txt
>
>
> Two datanucleus variables:
> {noformat}
> <property>
>  <name>datanucleus.autoCreateSchema</name>
>  <value>false</value>
> </property>
> <property>
>  <name>datanucleus.fixedDatastore</name>
>  <value>true</value>
> </property>
> {noformat}
> are dangerous.  We do want the schema to auto-create itself, but we do not want the schema
to auto update itself. 
> Someone might accidentally point a trunk at the wrong meta-store and unknowingly update.
I believe we should set this to false and possibly trap exceptions stemming from hive wanting
to do any update. This way someone has to actively acknowledge the update, by setting this
to true and then starting up hive, or leaving it false, removing schema modifies for the user
that hive usages, and doing all the time and doing the updates by hand. 



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