[Bug]: Fix JdbcIO Thread contention #34120
Description
What happened?
It seems that not all Datasources are thread safe when creating connections and can hang when many threads try to create connections at once. Since datasources can be shared across threads, this creates a problem.
To avoid this problem, we should:
- provide better thread synchronization mechanisms when getting connections
- test to make sure this doesn't dramatically impact performance
Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
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