add redis configuration and update workers default value

.env.example

@@ -1,6 +1,7 @@
 ### Server Configuration
 # HOST=0.0.0.0
 # PORT=9621
+# WORKERS=1
 # NAMESPACE_PREFIX=lightrag  # separating data from difference Lightrag instances
 # CORS_ORIGINS=http://localhost:3000,http://localhost:8080
 
@@ -138,3 +139,6 @@ MONGODB_GRAPH=false # deprecated (keep for backward compatibility)
 ### Qdrant
 QDRANT_URL=http://localhost:16333
 # QDRANT_API_KEY=your-api-key
+
+### Redis
+REDIS_URI=redis://localhost:6379

lightrag/api/utils_api.py

@@ -325,8 +325,8 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument(
         "--workers",
         type=int,
-        default=get_env_value("WORKERS", 2, int),
-        help="Number of worker processes (default: from env or 2)",
+        default=get_env_value("WORKERS", 1, int),
+        help="Number of worker processes (default: from env or 1)",
     )
 
     # LLM and embedding bindings