Welcome to the cutting edge of continuous integration!
Hajipur is a codename for the TeamCity 9.0.
This version of TeamCity contains new features, improvements and multiple bug fixes comparing to TeamCity 8.1.x
|Please make sure you back up your data (in the existing server from the administration UI or manually) before upgrade!|
You also might want to install the EAP version as a trial server.
Newer TeamCity versions usually adjust the data structure and you will not be able to go back to older TeamCity versions once the data is upgraded.