1559924775 opened a new pull request #13872:
URL: https://github.com/apache/pulsar/pull/13872


   
   Master Issue: #13860
   
   ### Motivation
   How to implement exactly once? Pulsar provides an implementation based on 
sequenceid, which requires users to maintain the mapping relationship between 
sequenceid and msg. This requires development costs for users。
   User data often has some characteristics, such as time, location, etc. we 
want to provide a way to convert the mapping relationship between maintenance 
sequenceid and MSG into the mapping relationship between data characteristics 
and msg, so as to reduce user development costs.
   
   ### Modifications
   


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