gaborgsomogyi commented on PR #29422:
URL: https://github.com/apache/flink/pull/29422#issuecomment-6194511803

   I've just had a deep dive and found the following:
   
   @eskabetxe How do you expect `stop-with-savepoint --drain` to help when 
switching back? My understanding is that drain closes the open files, but the 
savepoint is still taken before the commit, so the committer state still holds 
the commit recoverables of the final files, which the Hadoop serializer can't 
read. Is there a case I'm missing where that state ends up empty?
   
   @Samrat002 If my previous statement is right then there is no meaningful way 
to do any migration between Hadoop and Native connector written operator 
states. As such we must merge this (after in-depth review) no matter what since 
now there is no working way for `FileSink` users.


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