From 874b9ec081f8c609f1bd7542b15d7439690b474c Mon Sep 17 00:00:00 2001
From: Kevin_Zheng <zhengzhenyu@huawei.com>
Date: Fri, 8 Jan 2016 15:18:25 +0800
Subject: [PATCH] Trival fix a collector bug

Trival fix of a collector bug.

Change-Id: Ic993b3b90e1f7d67cfd75558046733b14a087739
---
 terracotta/locals/collector.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/terracotta/locals/collector.py b/terracotta/locals/collector.py
index ff74e7d..61943f7 100644
--- a/terracotta/locals/collector.py
+++ b/terracotta/locals/collector.py
@@ -353,8 +353,7 @@ class Collector(periodic_task.PeriodicTasks):
         :param current_vms: A list of VM at the current time frame.
         :return: A list of VM UUIDs removed since the last time frame.
         """
-        return substract_lists(previous_vms, current_vms)
-
+        return self.substract_lists(previous_vms, current_vms)
 
     def substract_lists(self, list1, list2):
         """ Return the elements of list1 that are not in list2.