After a mapReduce command has been performed in a database over one connection, an attempt to drop the same database in a second connection will silently fail. The command returns no error, but the database remains.

To reproduce, use the mongo shell to create two connections.

Connection1:
1. use mydb
2. db.items.save(

)
3. res = db.items.mapReduce("function()

", "function(k,v) { var c=0; for(i in v)

return c; }");
4. db[res.result].find()

Connection2:
1. use mydb
2. db.dropDatabase()

Expect: Either an error message stating a decent reason why the database could not be deleted, or the database to go away.

Actual: "show dbs" still lists "mydb"