title: Mongo replica sets load management
body: <p>Currently I have two node applications which use a mongo replica set (1 primary and 6 secondary). Currently the read queries of one application cause a load on mongo and affect the performance of the other application. So, I want to divide the secondary nodes such that 1 application uses the primary and 4 secondary members and the other application uses the primary and the other 2 secondary members. I don't want the load on one application to affect the other. How do i achieve the same?</p>