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 Implementation Notes for PB Wire Format
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- Need to see the actual number of byte[] copies that are done for each 
  marshall and unmarshall.  I suspect that we will need a custom
  CodedInputStream/CodedOutputStream implementations so we can do more 
  efficient scatter gather type byte[] handling.
  
- There are several objects which just wrap a String value, we might 
  need to consider re-factoring that out since it does not add value:
   * BrokerId
   * ConnectionId