XComp commented on a change in pull request #18189:
URL: https://github.com/apache/flink/pull/18189#discussion_r781204397



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File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/dispatcher/Dispatcher.java
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@@ -196,6 +198,8 @@ public Dispatcher(
 
         this.recoveredJobs = new HashSet<>(recoveredJobs);
 
+        this.globallyTerminatedJobs = new HashSet<>(globallyTerminatedJobs);

Review comment:
       These collections are cleared after the corresponding `JobManagerRunner` 
is created. The motivation behind that was, I guess, to save memory which 
sounds reasonable to me. If that's the case, using immutable sets for the 
`recoveredJobs` isn't a good idea.
   
   I treated the `globallyTerminatedJobs` in the same way for consistency 
reasons. We could switch to an immutable set for the `globallyTerminatedJobs` 
member. But I don't see us gaining much from it. I'd rather prefer having it 
done analogously, instead.




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