i,m trying to use gtm to sync two mongo instances.
first instance has been running for a while and has roughly 50GB of data.
my question is if i do a direct read and start writing to the secondary database what can i do about the changes made to the primary database while i,m reading the data since it can change after i read it
my own idea is to store the op-log while doing the direct read and then apply it to the second database.
i understand that there are already tools for this but this is part of a bigger project and i need to achieve this via code.
any better options?