Re: Slave not updating(no error, log position same as master)

[Rick James]

A Master needs a binlog for sending stuff to a Slave's relaylog.

A Master will not have a relaylog unless it is also a Slave.

A Slave _may_ have a binlog if either
* That Slave is Master to some more down-stream Slaves, and/or
* You want the binlog for certain forms of backup.

Note that two servers, each being both a Master and a Slave to each other is often called "dual-master" or "circular replication".

On another topic...
Since binlogs and relaylogs on various machines are cycled independently, their "Pos" values are rarely the same.