diff --git a/src/coordinator.rs b/src/coordinator.rs
index 53a3675..ec1a53c 100644
--- a/src/coordinator.rs
+++ b/src/coordinator.rs
@@ -1,29 +1,23 @@
 use std::collections::BinaryHeap;
-use std::io::ErrorKind;
+use std::fs::{File, OpenOptions};
 use std::net::SocketAddr;
-use std::panic::panic_any;
 use std::sync::Arc;
+use std::time::Duration;
 
-use aws_sdk_sqs::operation::receive_message::builders::ReceiveMessageFluentBuilder;
-use aws_sdk_sqs::operation::send_message::builders::SendMessageFluentBuilder;
-use bytemuck::bytes_of;
-use eyre::{anyhow, Error};
 use futures::future;
-use memmap::{Mmap, MmapOptions};
+use memmap::Mmap;
 use rayon::iter::{IntoParallelIterator, ParallelIterator};
-use serde::{Deserialize, Serialize};
 use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader};
 use tokio::net::TcpStream;
 use tokio::sync::mpsc::Receiver;
-use tokio::sync::{self, mpsc, Mutex};
+use tokio::sync::{mpsc, Mutex};
 use tokio::task::JoinHandle;
 
 use crate::bits::Bits;
 use crate::distance::{self, Distance, DistanceResults, MasksEngine};
-use crate::encoded_bits::EncodedBits;
-use crate::template::{self, Template};
+use crate::template::Template;
 
-const BATCH_SIZE: usize = 20_000; //TODO: probably make this configurable
+const BATCH_SIZE: usize = 20_000; //TODO: make this configurable
 
 pub struct Coordinator {
     aws_client: aws_sdk_sqs::Client,
@@ -68,7 +62,7 @@ impl Coordinator {
 
     //TODO: update error handling
     pub async fn spawn(mut self) -> eyre::Result<()> {
-        let mmap_db: Arc<Mmap> = Arc::new(self.initialize_mmap_db());
+        let mmap_db: Arc<Mmap> = Arc::new(self.initialize_mmap_db()?);
 
         loop {
             if let Some(messages) = self.dequeue_queries().await? {
@@ -105,7 +99,8 @@ impl Coordinator {
                 }
             }
 
-            //TODO: sleep for some amount of time
+            //TODO: decide how long to sleep
+            tokio::time::sleep(Duration::from_millis(100)).await;
         }
     }
 
@@ -316,8 +311,17 @@ impl Coordinator {
         Ok(distance_results)
     }
 
-    pub fn initialize_mmap_db(&self) -> Mmap {
-        todo!()
+    pub fn initialize_mmap_db(&self) -> eyre::Result<Mmap> {
+        //TODO: update this
+        // Try to open the file, or create it if it does not exist
+        let file = OpenOptions::new()
+            .read(true)
+            .write(true)
+            .create(true)
+            .open("masks")?;
+
+        // Memory-map the file
+        unsafe { Ok(Mmap::map(&file)?) }
     }
 
     pub async fn dequeue_queries(