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https://issues.apache.org/jira/browse/CALCITE-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16195064#comment-16195064
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ASF GitHub Bot commented on CALCITE-2003:
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Github user julianhyde commented on the issue:
https://github.com/apache/calcite-avatica/pull/17
no idea. looks a bit like this:
https://github.com/travis-ci/travis-ci/issues/8172
> Avoid global synchronization around openConnection in JdbcMeta
> --------------------------------------------------------------
>
> Key: CALCITE-2003
> URL: https://issues.apache.org/jira/browse/CALCITE-2003
> Project: Calcite
> Issue Type: Bug
> Components: avatica
> Reporter: Josh Elser
> Assignee: Josh Elser
> Fix For: avatica-1.11.0
>
>
> Had a report from a user where opening new connections to Avatica were stuck.
> Upon investigation, there was a single thread which had grabbed the local on
> the JdbcMeta instance in {{JdbcMeta#openConnection(ConnectionHandle)}}, but
> was not returning out of the {{DriverManager.getConnection(...)}} call.
> Using the {{ConcurrentMap}} API over the Guava {{Cache}} API gives us enough
> flexibility that we can handle this safely without the total synchronization.
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