{'$query':
{test:1}, '$readPreference':{mode:'secondary', tags: [
{dc:'sf',s:"1"},
{dc:'ma',s:"2"}]}}
Fails on 2.2 via mongos due to non-matching tags, returning an error. Returns documents on 2.4.0-rc0-pre.
{'$query':
{test:1}, '$readPreference':{mode:'secondary', tags: [
{dc:'sf',s:"1"},
{dc:'ma',s:"2"}]}}
Fails on 2.2 via mongos due to non-matching tags, returning an error. Returns documents on 2.4.0-rc0-pre.