Thanks for the reply! 

Could you please add this in the documentation? 


On Wednesday, October 28, 2015 at 8:57:09 PM UTC, Feng Xiao wrote:
>
> On Tue, Oct 27, 2015 at 5:02 AM, <cerea...@gmail.com <javascript:>> wrote:
>
>> Hello,
>>
>> I would like to learn about how oneof's are encoded in binary and what 
>> the serialization and deserialization cost maybe. To provide with some 
>> context, I am experimenting with a streaming rpc service. To be specific it 
>> is a client side streaming, something akin to the grpc documentation:
>>
>> rpc LotsOfGreetings(stream HelloRequest) returns (HelloResponse) {}
>>
>>
>> As many different messages maybe consumed during a lifetime of a single 
>> connection, we have opted to use oneofs to handle the different messages 
>> and dispatched to the appropriate handlers. As we may have potentially 
>> multiple layers of dispatching, this would require us to have multiple 
>> layer of oneofs (correct?). 
>>
>>
>> What I would like to know is how much type information is stored for the 
>> unset fields/types. As we may have a complex message hierarchy to solve our 
>> multiple layers, it would be great if someone could provide us answers 
>> regarding overhead for this processing as well.
>>
> On the wire, only the field that's actually set will be serialized so 
> extra fields in an oneof will have no extra cost.
>
> In the memory, we use unions in C++ and Object in Java to store oneof 
> fields, so unset fields will not take extra memory as well.
>
> Hope this answers your question.
>  
>
>>
>>
>> Thanks!
>>
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>

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