Shard depends on string comparison of replica set connection string

Start a sharded replica set and shard a collection. Update the shards collection in the config database so the shards are in a different order > db.shards.find({_id: "rs0"}) { "_id" : "rs0", "host" : "rs0/host1.example.com:27017,host2.example.com:27017" } > db.shards.update({_id: "rs0"}, { $set: { "host": "rs0/host2.example.com:27017,host1.example.com:27017" }}) WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }) Try to drop a sharded collection on the now-inconsistent shard - you should get mongos> db.testcoll.drop() Thu Jul 24 10:06:40.696 drop failed: { "code" : 13129, "ok" : 0, "errmsg" : "exception: can't find shard for: rs0/host1.example.com,host2.example.com" } at src/mongo/shell/collection.js:383