mongoimport reports 'imported n objects' when connected to secondary replica member - but has actually imported nothing. This is misleading. It should produce an error.

$ mongo --port 27018 test
> db.isMaster()
{
"setName" : "rep0",
"ismaster" : false,
"secondary" : true,
"hosts" : [
"192.168.2.63:27018",
"192.168.2.63:27017"
],
"arbiters" : [
"192.168.2.63:27019"
],
"primary" : "192.168.2.63:27017",
"ok" :
}
> bye

1. cat /tmp/bug.dat
   0, "xxxxx"
   1, "xxxxx"
   2, "xxxxx"
   3, "xxxxx"
   4, "xxxxx"
   5, "xxxxx"
   6, "xxxxx"
   7, "xxxxx"
   8, "xxxxx"
   9, "xxxxx"

$ mongoimport --port 27018 -f id,val -d test -c bug \
--type csv --file /tmp/bug.dat
connected to: 127.0.0.1:27018
imported 10 objects

$ mongo --port 27018 test
> db.getMongo().setSlaveOk()
> show collections
(nothing)