Github user jianbzhou commented on the issue:

    https://github.com/apache/storm/pull/1131
  
    @hmcl and all, the new spout is fit for the at least once semantics and 
works fine for us, thanks a lot! Very recently one of our key customers asked 
to use a at most once implementation. Do we have any plan to have a 
at-most-once implementation? They set the topology.acker.executors=0 and found 
the spout is not working. Could you please help to evaluate - 1, will we 
implement this? 2. roughly how long time needed? Thanks
    
    **Requirement from customer** - “topology.acker.executors” is a Storm 
parameter, which refers to at-least-once when it’s not 0, and at-most-once if 
it’s 0. We want to know do we have a at-most-once implementation?


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