Rajesh Balamohan created HIVE-22102:
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Summary: Reduce HMS call when createing HiveSession
Key: HIVE-22102
URL: https://issues.apache.org/jira/browse/HIVE-22102
Project: Hive
Issue Type: Improvement
Components: HiveServer2
Reporter: Rajesh Balamohan
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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