Merge pull request #3204 from kreuzert/exponential_backoff_overflow_exception

Prevent OverflowErrors in exponential_backoff()

jupyterhub/utils.py

@@ -173,7 +173,8 @@ async def exponential_backoff(
         # this prevents overloading any single tornado loop iteration with
         # too many things
         dt = min(max_wait, remaining, random.uniform(0, start_wait * scale))
-        scale *= scale_factor
+        if dt < max_wait:
+            scale *= scale_factor
         await gen.sleep(dt)
     raise TimeoutError(fail_message)