Feature: slaveOk && DataCenter awareness #41
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How to use?
Before calling mongo_replset_connect,
set conn->flags = MONGO_SLAVE_OK
set conn->preferred_tag = "cloud"
set conn->tag_name = "DC"
then the host "E" will be chosen!
{
_id : "someSet",
members : [
{_id : 0, host : "A", tags : {"DC": "ny"}},
{_id : 1, host : "B", tags : {"DC": "ny"}},
{_id : 2, host : "C", tags : {"DC": "sf"}},
{_id : 3, host : "D", tags : {"DC": "sf"}},
{_id : 4, host : "E", tags : {"DC": "cloud"}}
]