fix

llm_server/cluster/redis_config_cache.py

@@ -1,6 +1,7 @@
 import hashlib
 import pickle
 
+from llm_server.cluster.cluster_config import get_a_cluster_backend
 from llm_server.custom_redis import RedisCustom
 
 
@@ -57,4 +58,3 @@ class RedisClusterStore:
             backend_url = get_a_cluster_backend()
             print(f'Backend {old} offline. Request was redirected to {backend_url}')
         return backend_url
-