shared subnet declaration behavior between 2 pools

[project722]

Hello. im curious as to how dhcpd determines what pool to pull a lease from
in a shared subnet declaration. for ex on our server we have:

shared-network "Market 1" {
        option domain-name "example.com";
                subnet 192.168.1.0 netmask 255.255.255.0 {
                option broadcast-address 192.168.1.255;
                option routers 192.168.1.1;
                pool {


                       failover peer "dhcp-failover";
                       range 192.168.1.10 192.168.1.254;

        }
        subnet 192.168.2.0 netmask 255.255.255.0 {
                option broadcast-address 192.168.2.255;
                option routers 192.168.2.1;
                pool {

                        failover peer "dhcp-failover";
                        range 192.168.2.10 192.168.2.254;


               }
}

I would suspect that the broadcasts that come through these
routers/gateways determine the pool that dhcp assigns a lease from. So, if
a client requests is seen by the sever comes from 192.168.1.1 it will get a
lease out of that pool, and if it sees that the client requests cvomes from
192.168.2.1 it will get a lease from that pool. Is my understanding correct
on this? If that is correct, then what happens when the 192.168.1.0 network
gets full? Does dhcpd have some type of algo that allows it to assign a
lease from the 192.168.2.0 pool in order to prevent an out of leases
condition?
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