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https://issues.apache.org/jira/browse/HIVE-22102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates reassigned HIVE-22102:
---------------------------------
Assignee: Rajesh Balamohan
> Reduce HMS call when creating HiveSession
> -----------------------------------------
>
> Key: HIVE-22102
> URL: https://issues.apache.org/jira/browse/HIVE-22102
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Trivial
> Fix For: 4.0.0
>
> Attachments: HIVE-22102.1.patch
>
>
> When establishing HiveSession, it ends up configuring session
> variables/settings.
> As part of it, it ends up checking the database details.
> [https://github.com/apache/hive/blob/master/service/src/java/org/apache/hive/service/cli/session/HiveSessionImpl.java#L314]
> Even if it is `default` DB, it ends up making this check. In corner cases,
> these calls turn out to be expensive.
> {noformat}
> 2019-08-13T03:16:57,189 INFO [b42ba57f-1740-4174-855d-4e3f08319ca5
> HiveServer2-Handler-Pool: Thread-1552313] metadata.Hive: Total time spent in
> this metastore function was greater than 1000ms : getDatabase_(String, )=13265
> {noformat}
> We can just skip this check if its `DEFAULT_DATABASE_NAME` (default) DB. This
> may not be an issue for CachedStore.
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