random thoughts and discoveries

If you got here, you already know that by now PHP driver (<= 1.2) for Mongo don’t do queries on secondary using the setSlaveOkay() method.

You can use this quick&dirty hack:

$result = $_mongo->selectCollection(’$cmd’)->find(array(“group” => array(
	“ns” => “collectionName”,
	’$key’ => $key,
	’$condition’ => $condition,
	‘initial’ => $initial,
	’$reduce’ => $reduce
)))->slaveOkay()->limit(1)->getNext();

That should solve your problem.