leventov edited a comment on issue #8492: Improper Appenderator.add() calls concurrent with persist URL: https://github.com/apache/incubator-druid/issues/8492#issuecomment-529918478 First of all, your comment should belong to the codebase in some form. Second, it's hard to prove that the previous block which may add hydrants to `indexesToPersist` list is free of race conditions with some code updating (or not updating) `Sink.writable` field: https://github.com/apache/incubator-druid/blob/762f4d0e58b0f62c4225d978ab0d49509eb3598c/server/src/main/java/org/apache/druid/segment/realtime/appenderator/AppenderatorImpl.java#L551-L558 "Hard to prove" is already a defect actually. The codebase must not contain anything that requires a concurrency "proof" from a code reader. These "proofs" should be elaborated in very detailed comments (these comments must look a little more verbose than needed when you write them, otherwise they are not verbose enough).
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