Protocol buffer schemas are represented with what are called descriptors,
and descriptors themselves can be serialized as protocol buffers so that
you can save them on disk or send them over the network or whatever you
like. If you want to have a sort of schema registry for protocol buffers
then I would look into the DescriptorPool
and related classes. These don't provide a full-blown schema server, but
they provide all the core functionality that you would need to create one
fairly easily. Those classes I linked to are in C++, but we have similar
functionality for Java (I'm not sure offhand about other languages).
I don't think schema discovery is actually that useful for protocol buffers
most of the time, though. I'm not very familiar with Avro but from reading
about it today it appears that when you parse a message you need to have
more-or-less the exact schema that was used to serialize it. In that case I
can see why you might want to have a versioned schema registry. But with
Protobuf it's generally not a problem at all if your schema is older or
newer than that of the peer you're communicating with or the data you're
reading from disk. The worst that can happen is that you come across some
new fields that your schema doesn't know about, and when that happens they
are just treated as "unknown fields" and are invisible to you unless you
want to go out of your way to inspect them. With protobuf you almost always
just use the code generated by the protocol compiler (protoc), and there's
generally no need to even think about descriptors unless you're doing
something unusual. (The main example would be needing to manipulate message
types that are unknown at compile time.)
On Fri, Nov 18, 2016 at 7:59 AM, Ryan Morton <rmor...@zerofox.com> wrote:
> m conducting an investigation into the use of Protobuf for my organization
> and have a need to perform schema discovery. I've seen a number of articles
> related to Confluent Schema Registry with Avro. What are folks using for
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