I think the open-source equivalent of RecordIO is the leveldb log format: https://github.com/google/leveldb/blob/master/doc/log_format.md https://github.com/go

I think the open-source equivalent of RecordIO is the leveldb log format: https://github.com/google/leveldb/blob/master/doc/log_format.md https://github.com/google/leveldb/blob/master/doc/log_format... https://github.com/google/leveldb/blob/master/db/log_reader.h https://github.com/google/leveldb/blob/master/db/log_reader.... https://github.com/google/leveldb/blob/master/db/log_writer.h https://github.com/google/leveldb/blob/master/db/log_writer.... I think the decision not to open-source RecordIO is likely related to legacy baggage that's baked into the format. The LevelDB format above avoids that. It doesn't appear that the headers for this are public though.