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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1841) datanucleus.fixedDatastore should be true in hive-default.xml
Date Sun, 15 Nov 2015 08:31:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15005802#comment-15005802
] 

Lefty Leverenz commented on HIVE-1841:
--------------------------------------

Another doc note:  Ashutosh commented above, "Now we have schemaTool which automates schema
creation process. We can document that as step in installation guide."

>  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
>            Assignee: Ashutosh Chauhan
>            Priority: Minor
>              Labels: TODOC2.0
>             Fix For: 2.0.0
>
>         Attachments: HIVE-1841.1.patch.txt, HIVE-1841.2.patch, HIVE-1841.patch
>
>
> 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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