Go also sorts the map keys.
I heard it was, because that is what the C++ implementation is doing.

So do all implementations sort their fields by field number?
What languages do "all" include?

On Friday, 23 October 2015 23:26:06 UTC+2, Feng Xiao wrote:
>
> On Wed, Oct 21, 2015 at 10:31 AM, Brandon Philips <brandon...@coreos.com 
> <javascript:>> wrote:
>
>> Hello-
>>
>> The Open Container Initiative is investigating use of protobuf for use 
>> for filesystem and container metadata. Part of the goal is to make this 
>> metadata signable. However, we learned that protobuf binary serialization 
>> are not deterministic between implementations: 
>> https://groups.google.com/a/opencontainers.org/d/msg/dev/xo4SQ92aWJ8/ad1-xm9qCAAJ
>>
>> Is there any hope of that being tackled in protobuf3
>>
> Unlikely.
>  
>
>> or there being at least a mode to say "I really want the deterministic 
>> serialization"?
>>
> Maybe. There has been requests about adding such serialization support, 
> though we haven't put much effort in it because it's a low priority 
> comparing to many other stuff we are working on.
>  
>
>>
>> It isn't a huge blocker for us but it does mean the same spec serialized 
>> in a python tool and java tool MAY be different which is a bit annoying.
>>
> The undeterministic comes from unknown fields and a new feature protobuf 
> maps. If you can guarantee there are no such fields in your proto, the 
> protobuf library will always serialize other fields ordered by field number 
> and thus should output the same bytes. This is what most people are relying 
> on when they need to fingerprint or use protobuf serialized data as keys.
>  
>
>>
>> Thank You,
>>
>> Brandon
>>
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