count/distict implementation of DBCollection do not take ReadPreference, so eventually it goes to Primary instead of Secondary even we have specified secondary preference.

Here's the code caused this problem:
public long getCount(DBObject query, DBObject fields, long limit, long skip )
throws MongoException {

BasicDBObject cmd = new BasicDBObject();
cmd.put("count", getName());
cmd.put("query", query);
if (fields != null)

if ( limit > 0 )
cmd.put( "limit" , limit );
if ( skip > 0 )
cmd.put( "skip" , skip );

CommandResult res = _db.command(cmd,getOptions());

Here's when calling "_db.command(cmd,getOptions())" but not passing read preference, it works when I changed it to:
CommandResult res = _db.command(cmd,getOptions(),this.getReadPreference());

same issue for "distinct"