[GitHub] [beam] damccorm opened a new pull request, #17782: [BEAM-14536] Make sure End is never larger than Start when splitting offsetrange restriction

Tue, 31 May 2022 08:56:34 -0700 


damccorm opened a new pull request, #17782:
URL: https://github.com/apache/beam/pull/17782

   Right now, if you try to call TrySplit on an offsetrange restriction with a 
fraction of 0.0 and without first claiming work, it sets the primary 
restriction to {Start, Start-1}. This causes newSplitResult to panic - 
https://github.com/apache/beam/blob/ff39fcb5229b15140e41a61bd09f7d590730e93a/sdks/go/pkg/beam/core/runtime/exec/sdf.go#L859
   
   This fixes the issue by never allowing End to be set less than Start. That 
in turn creates a possible issue with the IsDone function (since the 
restriction should be considered done, but it won't be until claimed reaches 
End), which this PR handles as well.
   
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