On Wednesday, September 30, 2015 at 4:27:27 PM UTC-7, Feng Xiao wrote:
> > wrote:
>> We have been using the v3.0.0-alpha-3 library, and notice that the wire
>> format for serializing maps slightly changed in the v3.0.0-beta-1 version.
>> But the code using beta library is able to parse the messages serialized
>> using the alpha version. So, no big issues there. We just have to be
>> careful about using SerializeToString() for comparing two protobufs for
>> equality (and use the MessageDifferencer instead).
>> Could you confirm if the wire format change is limited to maps.
> It might not be intentional but there could be two possible changes to
> maps' wireformat: 1. whether 0 values are serialized, 2. the order of
> serialized elements. Both will affect the serialized bytes. They should not
> affect the actual value of the proto though. No matter which case it is all
> parsers must be able to parse the serialized result and produce the same
> parsed proto. I'm not aware of any other changes that could affect
> serialized bytes.
> Note that comparing proto serialized bytes is fragile especially after the
> introduction of maps because protobuf maps are unordered and the same
> content can yield different bytes even within the same process.
Thanks. This is probably what happened in my case too. Based on a cursory
check of the binary data, it appears that the ordering of fields changed
>> Also, will the code linked using alpha version be able to parse a string
>> that was generated by the beta version (In case of old code parsing the new
>> serialized strings). We are using C++, and using maps with proto2 format
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