thinkharderdev commented on code in PR #184:
URL: https://github.com/apache/arrow-ballista/pull/184#discussion_r962751050


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ballista/rust/scheduler/src/state/execution_graph.rs:
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@@ -581,6 +726,54 @@ impl ExecutionGraph {
         }
     }
 
+    /// Convert running stage to be unresolved
+    fn rollback_running_stage(&mut self, stage_id: usize) -> Result<bool> {

Review Comment:
   > We can have the expiration time longer than the executor's heartbeat time 
interval, so only after missing two or three consecutive heartbeats, the 
Scheduler consider it is dead.
   
   I think this is a good idea. We probably want to be pretty conservative in 
marking an executor dead due to missing heartbeats. 



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