ambari upgrade from 1.7 to 2.0?

[Xiaoyong Zhu]

Hi Experts

I am using Ambari 1.7 with HDP2.2. however, when I want to try Ambari 2.0, 
Ambari cannot start with following errors:

17 Apr 2015 08:44:37,331  WARN [main] AmbariServer:592 - Current database store 
version is not compatible with current server version, serverVersion=2.0.0, 
schemaVersion=1.7.0
17 Apr 2015 08:44:37,337 ERROR [main] AmbariServer:690 - Failed to run the 
Ambari Server
org.apache.ambari.server.AmbariException: Current database store version is not 
compatible with current server version, serverVersion=2.0.0, schemaVersion=1.7.0
        at 
org.apache.ambari.server.controller.AmbariServer.checkDBVersion(AmbariServer.java:593)
        at 
org.apache.ambari.server.controller.AmbariServer.run(AmbariServer.java:216)
        at 
org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:688)

is there a way I can upgrade to Ambari 2.0 directly without resetting the DB?

Thanks!

Xiaoyong