Github user bvbharatk commented on the issue:

    https://github.com/apache/cloudstack/pull/1965
  
    @ustcweizhou 
    We are saving the password in the user_vm_details explicitly. We are not 
checking if ssh key pair is set for this vm or not.
    
    I agree that ideally we should sync the password between the master and 
backup, For any kind of sync to work we need to know if the password was read 
from one of the VRs and In cases when one of the Vr is Stopped we will have to 
clear the password from db when it is read from the other one. These type of 
changes add complexity to the simple task of setting a password. The next best 
thing is to make sure we save the same password in both the routers. This will 
fix will at least solve the problem of sending the correct password even if the 
master and backup change state before the VM starts. 
    
    Yes like you pointed out this will lead to the problem that the user might 
receive the old password when he stop starts the VM, In this case the user will 
get a notification in the UI that his password will be changed.  So he at least 
knows what the password is and so he can log into the VM.


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