--- a/src/controller.rs	Sun Feb 07 19:26:21 2016 +0000
+++ b/src/controller.rs	Mon Feb 08 19:48:56 2016 +0000
@@ -63,7 +63,7 @@
         controller.clean_up();
     }
 
-    fn map_runner(mr: MR, params: MRParameters, inp: LinkedList<Record>) {
+    fn map_runner(mr: MR, params: MRParameters, inp: Vec<Record>) {
         if inp.len() == 0 {
             return;
         }
@@ -74,13 +74,13 @@
 
     fn read_map_input<In: Iterator<Item = Record>>(it: &mut In,
                                                    approx_bytes: usize)
-                                                   -> LinkedList<Record> {
-        let mut ll = LinkedList::new();
+                                                   -> Vec<Record> {
+        let mut ll = Vec::with_capacity(approx_bytes + 1024);;
         let mut bytes_read: usize = 0;
 
         for r in it {
             bytes_read += r.key.len() + r.value.len() + 4; // Heuristics :P
-            ll.push_back(r);
+            ll.push(r);
 
             if bytes_read > approx_bytes {
                 break;