Hi Feng, Is this still the case considering that 3.2.0 is out that allows the version number to be used by protoc?
General * Added protoc version number to protoc plugin protocol. It can be used by protoc plugin to detect which version of protoc is used with the plugin and mitigate known problems in certain version of protoc. Regards, Scott On Saturday, August 13, 2016 at 8:00:23 AM UTC+8, Feng Xiao wrote: > > On Thu, Aug 11, 2016 at 12:21 PM, Jeff Olson <jeff.d...@gmail.com > <javascript:>> wrote: > >> I've read through the release documents >> <https://github.com/google/protobuf/releases/tag/v3.0.0> for Protocol >> Buffers v3.0.0 but I can't find any statements regrading binary >> compatibility with version 2.6.1 (or earlier). There are a couple of things >> I'd like to know: >> >> >> 1. If I dump a 3.0.0 version of the >> com.google.protobuf/protobuf-java.jar in a project the depends on java >> classes generated by protoc v2.6.1 (or v2.5.0) will everything still >> work? >> That is, is the java runtime backwards compatible? >> >> Unfortunately no. The 3.0.0 version protobuf-java.jar will not work with > java classes generated by protoc v2.6.1 (or v2.5.0). For those who can not > upgrade to 3.0 directly, we are considering releasing a 2.7 version which > provides the following compatibility guarantees: > 1. 2.7 protobuf-java.jar will be compatible with java classes generated by > protoc 2.6.1 and protoc 2.5.0. > 2. 3.0 protobuf-java.jar will be compatible with java classes generated by > protoc 2.7 > > I.e., it allows you to upgrade to 3.0 in two steps: upgrade to 2.7, and > after all your dependencies are upgraded to either 2.7 or 3.0, you can > upgrade to 3.0 as well. It's not an ideal solution, but we hope it can help > ease the migration pain for some users. I'm testing this 2.7 version in a > github branch right now: https://github.com/google/protobuf/tree/2.7.0. > If you are interested, feel free to test it and any feedback is welcome. > > >> >> 1. Is the binary wire format the same for purely proto2 messages? If >> I serialize messages generated from proto2 sources using the 3.0.0 java >> runtime will clients using protobuf v2.6.1 be able to decode the messages >> correctly? >> >> Yes. The wire format stays the same as long as you are using the proto2 > syntax version. > > Thanks, >> Jeff >> >> -- >> 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 protobuf+u...@googlegroups.com <javascript:>. >> To post to this group, send email to prot...@googlegroups.com >> <javascript:>. >> Visit this group at https://groups.google.com/group/protobuf. >> For more options, visit https://groups.google.com/d/optout. >> > > -- *This message, including any attachments, may include private, privileged and confidential information and is intended only for the personal and confidential use of the intended recipient(s). If the reader of this message is not an intended recipient, you are hereby notified that any review, use, dissemination, distribution, printing or copying of this message or its contents is strictly prohibited and may be unlawful. If you are not an intended recipient or have received this communication in error, please immediately notify the sender by telephone and/or a reply email and permanently delete the original message, including any attachments, without making a copy.* -- 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 protobuf+unsubscr...@googlegroups.com. To post to this group, send email to protobuf@googlegroups.com. Visit this group at https://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
