sjmeyer commented on issue #5279: Slices backed by AWS Athena load sequentially, not in parallel. URL: https://github.com/apache/incubator-superset/issues/5279#issuecomment-403489927 @mistercrunch It seems like the issue is the running of the JDBC driver jar. A new JVM gets created for each connection, instead of threads being added to one running JVM. I think it has something to do with SQLAlchemy wanting one thread per process.
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