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https://issues.apache.org/jira/browse/HIVE-22469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16972619#comment-16972619
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David Mollitor commented on HIVE-22469:
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[~mgergely] Thank you for the review! Pushed to master.
> 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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