Josh Elser created CALCITE-2003:
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Summary: 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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