Comment 5 for bug 1634746

It takes about two months to generate 30,000 revocation events.In out deployment has 40 compute nodes and 4 controller nodes. We have a script to clean expired token every fifteen minutes which stored in mysql. However the databases encountered a deadlock problem and the script does not take effect. Finally, we found that our api response need about 6 seconds. We check code found there were 30,000 revocation events in our database.And keystone read it from mysql take 0.1second but convert these to dict in mem need 3seconds.