1. RTT

2. Customer using several version clients.
client v1.1
client v1.2
client v1.2

3. v1.2 Today we announce a revolutionary service,
that will be a great improvement to productivity

4. v2.0 Today we announce a revolutionary service,
that will be a great improvement to productivity

5. v2.0 Today we announce a revolutionary service,
that will be a great improvement to productivity

6. v1.2
v2.0
client v2.0
client v1.1
client v2.0
client v1.2
client v1.2

7. When we updating the service some client may not work well.
client v2.0
client v1.1
client v2.0
client v1.2
client v1.2

8. ? = ! ≠ Before upgrading RTT can clone customer operation to
v1.2
v2.0 ! ≠
Before upgrading RTT can
clone customer operation to
new service.
client v1.1
client v1.2

9. ? = By comparing the response of current service and
client v1.2
By comparing the response
of current service and
new service we can find bugs.
client v1.1
client v1.2

10. ? =
v1.2
v1.2
v2.0 ＝
client v1.1
client v1.2

11. ? =
v1.2
v1.2
v2.0
client v1.2
client v1.1
client v1.2

12. v1.2
v2.0
client v2.0
client v1.1
client v2.0
client v1.2
client v1.2