Add log to coordinator retry method

Author: edouardparis

src/coordinator.rs

@@ -42,6 +42,10 @@ impl CoordinatorClient {
                 Ok(res) => return Ok(res),
                 Err(e) => error = Some(e),
             }
+            log::debug!(
+                "Error while communicating with coordinator: {:?}, retrying",
+                error,
+            );
         }
         Err(error.expect("An error must have happened"))
     }