FrancescoCastaldi commented on issue #45491:
URL: https://github.com/apache/superset/issues/45491#issuecomment-6524020953
### Root Cause Analysis & Solution
In `superset/coordination/cache_backend.py:RedisSentinelCacheBackend`, the
constructor did not accept a `username` argument, and `master_kwargs` passed to
`self._sentinel.master_for(master, **master_kwargs)` omitted both `db` and
`username`.
Because `db` was not forwarded, Sentinel connections were always routed to
database 0. Furthermore, environments utilizing Redis ACLs with
`CACHE_REDIS_USER` failed to authenticate because the username was ignored.
#### Solution
1. Add `username: str | None = None` to `RedisSentinelCacheBackend.__init__`.
2. Forward `master_kwargs["db"] = db` and `master_kwargs["username"] =
username` when initializing the master connection.
3. Read `config.get("CACHE_REDIS_USER", None)` in `from_config`.
Verified with unit tests in
`tests/unit_tests/coordination/test_cache_backend.py` and committed to branch
`fix/community-unanswered-issues` (commit `1c4efaf7124`) at
https://github.com/FrancescoCastaldi/superset/tree/fix/community-unanswered-issues.
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