diff --git a/disk/src/binned.rs b/disk/src/binned.rs
index bfcebe7..7d55ff9 100644
--- a/disk/src/binned.rs
+++ b/disk/src/binned.rs
@@ -355,6 +355,7 @@ where
     T: ReadableFromFile,
 {
     buf: Vec<u8>,
+    all: Vec<u8>,
     file: Option<File>,
     _marker: std::marker::PhantomData<T>,
 }
@@ -365,7 +366,9 @@ where
 {
     fn new(file: File) -> Self {
         Self {
-            buf: vec![],
+            // TODO make buffer size a parameter:
+            buf: vec![0; 4096],
+            all: vec![],
             file: Some(file),
             _marker: std::marker::PhantomData::default(),
         }
@@ -380,20 +383,22 @@ where
 
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
         use Poll::*;
-        'outer: loop {
-            // TODO make buffer size a parameter:
-            let mut buf = vec![0; 4096];
+        let mut buf = std::mem::replace(&mut self.buf, Vec::new());
+        let ret = 'outer: loop {
             let mut dst = ReadBuf::new(&mut buf);
+            if dst.remaining() == 0 || dst.capacity() == 0 {
+                break Ready(Err(Error::with_msg("bad read buffer")));
+            }
             let fp = self.file.as_mut().unwrap();
             let f = Pin::new(fp);
             break match File::poll_read(f, cx, &mut dst) {
                 Ready(res) => match res {
                     Ok(_) => {
                         if dst.filled().len() > 0 {
-                            self.buf.extend_from_slice(&mut buf);
+                            self.all.extend_from_slice(dst.filled());
                             continue 'outer;
                         } else {
-                            match T::from_buf(&mut self.buf) {
+                            match T::from_buf(&mut self.all) {
                                 Ok(item) => Ready(Ok(StreamItem::DataItem(RangeCompletableItem::Data(item)))),
                                 Err(e) => Ready(Err(e)),
                             }
@@ -403,7 +408,9 @@ where
                 },
                 Pending => Pending,
             };
-        }
+        };
+        self.buf = buf;
+        ret
     }
 }
 
diff --git a/retrieval/src/client.rs b/retrieval/src/client.rs
index 695b73f..26df6a8 100644
--- a/retrieval/src/client.rs
+++ b/retrieval/src/client.rs
@@ -47,6 +47,10 @@ pub async fn get_binned(
     disk_stats_every_kb: u32,
 ) -> Result<(), Error> {
     info!("-------   get_binned  client");
+    info!("channel {}", channel_name);
+    info!("beg  {}", beg_date);
+    info!("end  {}", end_date);
+    info!("-------");
     let t1 = Utc::now();
     let date_fmt = "%Y-%m-%dT%H:%M:%S.%3fZ";
     let uri = format!(
@@ -65,7 +69,6 @@ pub async fn get_binned(
         cache_usage.query_param_value(),
         disk_stats_every_kb,
     );
-    info!("get_binned  uri {:?}", uri);
     let req = hyper::Request::builder()
         .method(http::Method::GET)
         .uri(uri)
@@ -78,7 +81,15 @@ pub async fn get_binned(
         let (head, body) = res.into_parts();
         let buf = hyper::body::to_bytes(body).await?;
         let s = String::from_utf8_lossy(&buf);
-        return Err(Error::with_msg(format!("Server error  {:?}\n---------------------- message from http body:\n{}\n---------------------- end of http body", head, s)));
+        return Err(Error::with_msg(format!(
+            concat!(
+                "Server error  {:?}\n",
+                "---------------------- message from http body:\n",
+                "{}\n",
+                "---------------------- end of http body",
+            ),
+            head, s
+        )));
     }
     let perf_opts = PerfOpts { inmem_bufcap: 512 };
     let s1 = disk::cache::HttpBodyAsAsyncRead::new(res);