// https://jira.mongodb.org/browse/SERVER-4534
// Building an index in the forground on a field with a large array and few documents in
// the collection used to open too many files and crash the server.
t = db.huge_multikey_index
t.drop()

function doit() {
    arr = []
    for (var i=0; i< 1000*1000;i++)
        arr.push(i);

    t.insert({a:arr})

    //t.ensureIndex({a:1}, {background:true}) // always worked

    t.ensureIndex({a:1}) // used to fail server with out of fds error
}

doit();