Add max_overflow connections #2054
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Description
We sometimes see QueuePool timeout and run out of connections. This adds max_overflow connections (default is 10) which will be instantiated when pool_size has run out then cleaned up after use.
(20 pool_size + 10 max_overflow) * (16 gunicorn workers) = 480 connections.
Tests
How will this change be monitored?
sqlalchemy.exc.TimeoutError: QueuePool limit of sizelogs.https://analytics.amplitude.com/audius/chart/ma21km1?source=redirect%3A+chart+saved