Persisting protobufs to disk

[Matthew Eck]

Is there a recommended, documented format for reading and writing protobuf mesages to/from a file? 

Preferably without converting to JSON. I seek something equivalent to Google's internal RecordIO format, which AFAICT is not published; something like Avro object container file, except for protobuf. 

Thanks.

[Adam Cozzette]

There's not really an official recommended format for doing this. Probably the easiest thing is to store the raw serialized message, if you can fit everything into one message in a reasonable way without it being too big. The other common approach is just to store a simple series of messages, with each message prefixed by its size as a varint. This is sometimes called the "delimited" format and for some languages we include support for it. For example here is the code implementing it in C++: https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/util/delimited_message_util.h

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