Improve stability and resilience on intermittent network connection

trains/backend_api/config/default/api.conf

@@ -34,7 +34,7 @@
             # backoff parameters
             # timeout between retries is min({backoff_max}, {backoff factor} * (2 ^ ({number of total retries} - 1))
             backoff_factor: 1.0
-            backoff_max: 300.0
+            backoff_max: 120.0
         }
 
         wait_on_maintenance_forever: true

trains/backend_api/utils.py

@@ -4,7 +4,6 @@ import sys
 
 import requests
 from requests.adapters import HTTPAdapter
-## from requests.packages.urllib3.util.retry import Retry
 from urllib3.util import Retry
 from urllib3 import PoolManager
 import six