alamb commented on a change in pull request #1537:
URL: https://github.com/apache/arrow-datafusion/pull/1537#discussion_r782113988



##########
File path: ballista/rust/scheduler/src/main.rs
##########
@@ -62,14 +63,18 @@ async fn start_server(
         "Ballista v{} Scheduler listening on {:?}",
         BALLISTA_VERSION, addr
     );
+    //there should be only one SchedulerServer in process

Review comment:
       Perhaps using something like `lazy_static` 
(https://docs.rs/lazy_static/1.4.0/lazy_static/, already a dependency) might be 
worth looking into




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