[autoscaler] Bad error message when dict field omitted (ray-project#1632

)

* Wed Feb 28 23:22:55 PST 2018

* Wed Feb 28 23:24:07 PST 2018

python/ray/autoscaler/autoscaler.py

@@ -467,6 +467,13 @@ def debug_string(self, nodes=None):
  suffix, self.load_metrics.debug_string())
 
 
+def typename(v):
+ if isinstance(v, type):
+ return v.__name__
+ else:
+ return type(v).__name__
+
+
 def validate_config(config, schema=CLUSTER_CONFIG_SCHEMA):
  if type(config) is not dict:
  raise ValueError("Config is not a dictionary")
@@ -476,7 +483,7 @@ def validate_config(config, schema=CLUSTER_CONFIG_SCHEMA):
  if k not in config:
  raise ValueError(
  "Missing required config key `{}` of type {}".format(
- k, v.__name__))
+ k, typename(v)))
  if isinstance(v, type):
  if not isinstance(config[k], v):
  raise ValueError(