Every call to get_redis_connection() spawned a new pool, so workers slowly accumulated thousands of open sockets. Even though connections were eventually released, skewed release timing still pushed us past Redis’ max-clients and the cluster egress IP cap.
A module-level _CONNECTION_CACHE now memoises pools by (redis_url, sentinel_hosts, async_mode, decode_responses).
Result: flat connection count, no more IP or FD exhaustion. Public API unchanged.
Signed-off-by: Sihyeon Jang <sihyeon.jang@navercorp.com>
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