When customer deployed redundancy policy servers, and fail back does not work properly.
The work sequence is as below.
1. Stop primary policy server.
2. Request 50 thread per second and all of them fail over to secondary policy server.
3. Start primary policy server.
4. Request 50 thread per second again, but about 10 of them threads does not fail back soon.
5. After about 10 minutes, all threads fail back completely.
Why does it takes some time to fail back all threads completely ?