[protobuf] Re: Issue 257 in protobuf: Java Protocol buffer payload more than that of regular payload when using repeated tag

[protobuf]

Updates:
        Status: WorkingAsIntended

Comment #4 on issue 257 by jas...@google.com: Java Protocol buffer payload  
more than that of regular payload when using repeated tag
http://code.google.com/p/protobuf/issues/detail?id=257
I tried an example around AddressBook, creating 100 person entries:

for (int i = 0; i < 100; ++i) {
      Person.Builder personBuilder = Person.newBuilder()
          .setName("Person " + i)
          .setId(i)
          .setEmail("person" + i + "@gmail.com");
      builder.addPerson(personBuilder.build());
    }
}

I converted this to an equivalent class (keeping the unused phone entries):
  static class PhoneNumber implements java.io.Serializable {
    public String number;
    public int type;
  }

  static class PersonJava implements java.io.Serializable {
    public String name;
    public int id;
    public String email;
    public List<PhoneNumber> phoneNumbers;
  }

Serializing the equivalent List<PersonJava> was larger:

Proto serialized size: 3480
Java serialized size: 4550

I'm not sure if there's something special about your protocol definition  
that allows Java serialization to be smaller. However, most of the  
independent investigations I've seen show that protobuf encoding is  
smaller. Either way, we can't change the wire format, so I'm closing this  
bug. Feel free to start a thread on the googlegroup if there's anything  
you'd like to discuss.

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