David Mollitor commented on HIVE-22469:

[~mgergely] Can you also take a look at this one please? :)

> Lower Metastore DB Connection Pool Size in QTests
> -------------------------------------------------
>                 Key: HIVE-22469
>                 URL: https://issues.apache.org/jira/browse/HIVE-22469
>             Project: Hive
>          Issue Type: Improvement
>          Components: Test, Tests
>    Affects Versions: 3.2.0
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Minor
>         Attachments: HIVE-22469.1.patch, HIVE-22469.2.patch, 
> HIVE-22469.3.patch
> Hive Metastore uses the 'HikariCP' database connection pool. The default 
> number of connections to the database is 10. For the Qtests, connecting to a 
> local DerbyDB, there need not be more than 4 connections. Anymore simply adds 
> undo overhead and by looking at the QTest logs, I see a bunch of 'connection 
> refused' from HikariCP. It may be the case that the standalone DB does not 
> support that many concurrent connections anyway.
> [https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-MetaStore]
> I also unified all of the JDBC connection strings to ensure that each test is 
> using an in-memory database.

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