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From "Ashutosh Chauhan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2029) MetaStore ConnectionURL updates need to trigger creation of Default DB if it doesn't exist
Date Sun, 23 Oct 2011 20:20:32 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133723#comment-13133723
] 

Ashutosh Chauhan commented on HIVE-2029:
----------------------------------------

@Paul,
>From the url I quoted above:
bq. DataNucleus has the capability to switch to between DataSources upon failure of one while
obtaining a datastore connection. The failover mechanism is useful for applications with multiple
database nodes when the data is actually replicated/synchronized by the underlying database.
So, DN will try to connect to a slave automatically when it can't connect with master. But
it won't promote the slave to master so metastore can proceed with read only queries on DB.
This falls short of what you have described, but once we upgrade to 3.x via HIVE-2084 we can
atleast simplify the reconnect logic.
                
> MetaStore ConnectionURL updates need to trigger creation of Default DB if it doesn't
exist
> ------------------------------------------------------------------------------------------
>
>                 Key: HIVE-2029
>                 URL: https://issues.apache.org/jira/browse/HIVE-2029
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>    Affects Versions: 0.7.0
>            Reporter: Carl Steinbach
>         Attachments: hive_2029.patch
>
>
> HIVE-1219 defined the JDOConnectionURLHook plugin, and integrated this feature into HiveMetaStore.
On MetaStore operation failures, this plugin is used to update the metastore ConnectionURL
configuration property. Currently this update triggers the reinitialization of the underlying
JDO PersistenceManager, but it does not trigger checks to see if the default database exists,
nor will it create the default database if it does not exist. It needs to do both.
> This ticket also covers removing the 'hive.metastore.force.reload.conf' property from
HiveConf and HiveMetaStore. This property should not have been added in the first place since
its sole purpose is to facilitate testing of the JDOConnectionURLHook mechanism by unnaturally
forcing reinitialization of the PersistenceManager.

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