rkhachatryan edited a comment on pull request #18654:
URL: https://github.com/apache/flink/pull/18654#issuecomment-1034174423


   I've discovered several unrelated issues that cause 
`ProcessingTimeWindowCheckpointingITCase` to hang or fail: mostly FLINK-26062; 
also FLINK-26019 and FLINK-26063.
   
   Besides that, I've published an alternative fix to the problem of this PR: 
#18693. It makes `lastAppendedSequenceNumber` return `Optional`. That way seems 
less invasive and more explicit. But in your version API seems more clear.
   
   WDYT?


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