On Thursday, March 14, 2019 at 2:12:31 PM UTC-4, Adam Cozzette wrote: > > Going from proto3 to proto2 should be fine. There are some slight > differences but I can't think of any major problems. The only thing that > comes to mind is that proto2 handles unknown enum values a little bit > differently from proto3. I doubt that would be a problem but if you want to > be extra cautious you could double-check that you're not storing any > unknown enum values. > > However, there is no need to downgrade to version 2.6.1 and if anything > that would only introduce bugs and make the code slower. The proto2 > semantics are still fully supported in all versions going forward, so all > you have to do is put syntax = "proto2"; at the top of your .proto files. > You can stick with 3.6.1 or even upgrade to any newer version. > > On Thu, Mar 14, 2019 at 10:21 AM Jason Huang <[email protected] > <javascript:>> wrote: > >> i chose proto3 for cache （serialize） for my application , and it have run >> for several month . but now i wanna change my mind for proto2 , because the >> hasField is really needed . >> >> the problem is , there're still lots of data in the cache which are >> serialized with proto3 , if i can't deserialize with them with proto2 . it >> will be unacceptable . >> > There is "some" backwards compatibility if you need to import proto3 into proto2. Groups is the chief one that the docs talk about that I know of.
https://developers.google.com/protocol-buffers/docs/proto#groups my question is , is it safe to switch from proto3 to proto2 ? i made some >> test i could work in some case . but i'm afraid this is not full coverage >> test . >> >> my current proto3 version is 3.6.1 , and the proto2 version i want to use >> is 2.6.1 >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Protocol Buffers" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at https://groups.google.com/group/protobuf. >> For more options, visit https://groups.google.com/d/optout. >> > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
