Add a cache for GatewayBackend to HaGatewayManager #501
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Description
Currently, Trino Gateway stops routing queries when the database is unavailable.
This PR adds a cache of
GatewayBackend
to theHaGatewayManager
, ensuring that queries can still be routed even when the database is unavailable.The cache is read-only, so update operations to
GatewayBackend
will still fail if the database is unavailable.Release notes
( x) This is not user-visible or is docs only, and no release notes are required.