xintongsong edited a comment on issue #8740: [FLINK-12763][runtime] Fail job immediately if tasks’ resource needs can not be satisfied. URL: https://github.com/apache/flink/pull/8740#issuecomment-509587077 Thank you for the review, @StephanEwen. I don't think this is a bug. If the required profile is equal to unknown, the `isMatching` will return `true` anyway according to the comparing logics. The `(required == UNKNOWN)` is only a shortcut to avoid comparing individual properties, bcause comparing object reference is much less work than comparing the properties. If we use `UNKNOWN.equals(required)` here, it will not speed up at all.
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