diff --git a/disk/src/cache/pbv.rs b/disk/src/cache/pbv.rs
index e8ace01..beff55d 100644
--- a/disk/src/cache/pbv.rs
+++ b/disk/src/cache/pbv.rs
@@ -376,6 +376,7 @@ where
                                 continue 'outer;
                             }
                             Err(e) => match e.kind() {
+                                // TODO other error kinds
                                 std::io::ErrorKind::NotFound => match self.try_setup_fetch_prebinned_higher_res() {
                                     Ok(_) => {
                                         if self.fut2.is_none() {
@@ -398,7 +399,7 @@ where
                                     }
                                 },
                                 _ => {
-                                    error!("File I/O error: {:?}", e);
+                                    error!("File I/O error:  kind {:?}  {:?}\n\n..............", e.kind(), e);
                                     self.errored = true;
                                     Ready(Some(Err(e.into())))
                                 }
diff --git a/retrieval/Cargo.toml b/retrieval/Cargo.toml
index 0ba2257..5101d11 100644
--- a/retrieval/Cargo.toml
+++ b/retrieval/Cargo.toml
@@ -22,6 +22,7 @@ serde_derive = "1.0"
 serde_json = "1.0"
 chrono = "0.4"
 clap = "3.0.0-beta.2"
+lazy_static = "1.4.0"
 err = { path = "../err" }
 taskrun = { path = "../taskrun" }
 netpod = { path = "../netpod" }
diff --git a/retrieval/src/test.rs b/retrieval/src/test.rs
index 5b8970a..6dc4afb 100644
--- a/retrieval/src/test.rs
+++ b/retrieval/src/test.rs
@@ -15,10 +15,39 @@ use hyper::Body;
 use netpod::log::*;
 use netpod::{AggKind, Channel, Cluster, Database, HostPort, NanoRange, Node, PerfOpts};
 use std::future::ready;
+use std::sync::{Arc, Mutex};
 use tokio::io::AsyncRead;
+use tokio::task::JoinHandle;
 
 pub mod json;
 
+struct RunningHosts {
+    cluster: Cluster,
+    _jhs: Vec<JoinHandle<Result<(), Error>>>,
+}
+
+lazy_static::lazy_static! {
+    static ref HOSTS_RUNNING: Mutex<Option<Arc<RunningHosts>>> = Mutex::new(None);
+}
+
+fn require_test_hosts_running() -> Result<Arc<RunningHosts>, Error> {
+    let mut g = HOSTS_RUNNING.lock().unwrap();
+    match g.as_ref() {
+        None => {
+            let cluster = test_cluster();
+            let jhs = spawn_test_hosts(cluster.clone());
+            let ret = RunningHosts {
+                cluster: cluster.clone(),
+                _jhs: jhs,
+            };
+            let a = Arc::new(ret);
+            *g = Some(a.clone());
+            Ok(a)
+        }
+        Some(gg) => Ok(gg.clone()),
+    }
+}
+
 fn test_cluster() -> Cluster {
     let nodes = (0..3)
         .into_iter()
@@ -50,15 +79,15 @@ fn get_binned_binary() {
 }
 
 async fn get_binned_binary_inner() -> Result<(), Error> {
-    let cluster = test_cluster();
-    let _hosts = spawn_test_hosts(cluster.clone());
+    let rh = require_test_hosts_running()?;
+    let cluster = &rh.cluster;
     if true {
         get_binned_channel(
             "wave-f64-be-n21",
             "1970-01-01T00:20:10.000Z",
             "1970-01-01T00:20:30.000Z",
             2,
-            &cluster,
+            cluster,
             true,
             2,
         )
@@ -70,7 +99,7 @@ async fn get_binned_binary_inner() -> Result<(), Error> {
             "1970-01-01T01:11:00.000Z",
             "1970-01-01T01:35:00.000Z",
             7,
-            &cluster,
+            cluster,
             true,
             24,
         )
@@ -82,7 +111,7 @@ async fn get_binned_binary_inner() -> Result<(), Error> {
             "1970-01-01T01:42:00.000Z",
             "1970-01-01T03:55:00.000Z",
             2,
-            &cluster,
+            cluster,
             true,
             3,
         )
diff --git a/retrieval/src/test/json.rs b/retrieval/src/test/json.rs
index 3700719..35d0837 100644
--- a/retrieval/src/test/json.rs
+++ b/retrieval/src/test/json.rs
@@ -1,5 +1,4 @@
-use crate::spawn_test_hosts;
-use crate::test::test_cluster;
+use crate::test::require_test_hosts_running;
 use chrono::{DateTime, Utc};
 use disk::cache::BinnedQuery;
 use err::Error;
@@ -14,14 +13,14 @@ fn get_binned_json_0() {
 }
 
 async fn get_binned_json_0_inner() -> Result<(), Error> {
-    let cluster = test_cluster();
-    let _hosts = spawn_test_hosts(cluster.clone());
+    let rh = require_test_hosts_running()?;
+    let cluster = &rh.cluster;
     get_binned_json_0_inner2(
         "wave-f64-be-n21",
         "1970-01-01T00:20:10.000Z",
         "1970-01-01T01:20:30.000Z",
         10,
-        &cluster,
+        cluster,
     )
     .await
 }