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-rwxr-xr-xsynapse/app/homeserver.py13
1 files changed, 7 insertions, 6 deletions
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index 56a34bd50b..e5066c48ef 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -255,12 +255,13 @@ class SynapseHomeServer(HomeServer):
             quit_with_error(e.message)
 
     def get_db_conn(self):
-        db_conn = self.database_engine.module.connect(
-            **{
-                k: v for k, v in self.db_config.get("args", {}).items()
-                if not k.startswith("cp_")
-            }
-        )
+        # Any param beginning with cp_ is a parameter for adbapi, and should
+        # not be passed to the database engine.
+        db_params = {
+            k: v for k, v in self.db_config.get("args", {}).items()
+            if not k.startswith("cp_")
+        }
+        db_conn = self.database_engine.module.connect(**db_params)
 
         self.database_engine.on_new_connection(db_conn)
         return db_conn