zentol commented on pull request #15019:
URL: https://github.com/apache/flink/pull/15019#issuecomment-785808932
One issues is that the semantics for the attempt numbers as a whole are not
really well-defined; internally we use it to differentiate different
deployments (for example, when we tried to create deterministic
`ExecutionAttemptIDs`), but users probably think more of it like "how often did
this subtask fail".
I'm not even sure how valuable the attempt number is as a whole; I'd think
that users either want to identify instable TaskManagers (where the question is
"how many failures occur on this TM") or operators ("how often do subtasks of
this operator fail?"), but the attempt number fulfills neither because it is
also incremented for subtasks did not actually cause a failure.
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