rawlinp commented on a change in pull request #1908: Changes for Backup Edge 
Cache Group
URL: 
https://github.com/apache/incubator-trafficcontrol/pull/1908#discussion_r171925592
 
 

 ##########
 File path: docs/source/admin/traffic_ops/using.rst
 ##########
 @@ -881,7 +899,7 @@ The CZF is an input to the Traffic Control CDN, and as 
such does not get generat
 
 The script that generates the CZF file is not part of Traffic Control, since 
it is different for each situation.
 
-.. note:: The ``"coordinates"`` section is optional and may be used by Traffic 
Router for localization in the case of a CZF "hit" where the zone name does not 
map to a Cache Group name in Traffic Ops (i.e. Traffic Router will route to the 
closest Cache Group(s) geographically).
+.. note:: The ``"coordinates"`` section is optional and may be used by Traffic 
Router for localization in the case of a CZF "hit" where the zone name does not 
map to a Cache Group name in Traffic Ops (i.e. Traffic Router will route to the 
closest Cache Group(s) geographically). The ``"backupZones"`` section is 
optional and is used by Traffic Router for localization in the case of a CZF 
"hit" when there are no caches available for that DS in the matched cache 
group.  This backup list is ordered and if there are no caches available in any 
of the configured backup cache groups, the request will be bypassed (if 
configured) or rejected or gets to the closest cache groups if configured 
(``"fallbackToClosestGroup"`` flag) for this backup configuration.
 
 Review comment:
   I would break this last sentence up to make it clearer (starting from "This 
backup list...":
   This backup ``"list"`` contains an ordered list of backup groups to choose 
from if the matched cache group has no caches available for a requested DS. If 
an available cache cannot be found in any of the backup groups either, the 
``"fallbackToClosestGroup"`` flag determines the Traffic Router's following 
behavior. If ``true``, Traffic Router will find the next closest cache group 
with available caches. If ``false`` (the default), Traffic Router will bypass 
the request (if configured) or reject it.

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