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Posted to issues@hive.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2019/08/14 03:59:00 UTC
[jira] [Updated] (HIVE-22102) Reduce HMS call when creating
HiveSession
[ https://issues.apache.org/jira/browse/HIVE-22102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rajesh Balamohan updated HIVE-22102:
------------------------------------
Summary: Reduce HMS call when creating HiveSession (was: Reduce HMS call when createing HiveSession)
> 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
> Priority: Trivial
> 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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