xintongsong commented on PR #21447:
URL: https://github.com/apache/flink/pull/21447#issuecomment-1354053526

   > The execution-vertex cache just saves the result when requesting the flame 
graph for subtask level, right?
   
   Yes.
   
   > Is it typo? For the subtask flame graph, we should first check the 
execution-vertex cache, then the job-vertex cache, right?
   
   Well, there's no typo, but I think the order doesn't really matter. Checking 
the job-vertex cache first would allow us to access the execution-vertex cache 
with a simple computeIfAbsent-style logic. But that depends on the detailed 
implementation.


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