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[陈军 <cxd1098@xxxxxxxx>]

Every service that receives requests with a token needs to communicate with keystone to verify a user's identity.
A rough diagram of how keystone works can be found in the sequence diagram:http://docs.openstack.org/trunk/openstack-identity/admin/content/what-is.html

While there is a mass of users or the scale of cloud becomes huge,will keystone be the bottlenect?