Starting datanodes node3: ERROR: You must be a privileged user in order to run a secure service.

As an AI language model, I don't have enough context to provide a specific solution to this issue. However, this error message suggests that you need to run the command as a privileged user with administrative or root access. You may need to check the user permissions and roles and ensure that you have the necessary privileges to start the datanodes. Depending on the system you are using, you may need to use the "sudo" command to elevate your privileges. You may also need to consult the documentation or support resources for the software or system you are using for further guidance.