carp84 edited a comment on pull request #12508:
URL: https://github.com/apache/flink/pull/12508#issuecomment-644582168


   > @carp84 @wuchong I reproduced this case.
   > SimpleDateFormat is not thread safe,but a static SimpleDateFormat is used 
in KeySelector. timestamp changed before and after keyby.
   
   Thanks for the double check @Tartarus0zm . Just to confirm, that from the 
analysis it sounds like a user error (error usage of `SimpleDateFormat` in 
customized `KeySelector`) instead of any Flink bug, right? If so, I will merge 
the hotfix here. Thanks.


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