출처 : https://blogs.cisco.com/sp/streaming-telemetry-with-google-protocol-buffers

Summary

JSON, “compact” GPB and “Key-Value” GPB

• “Compact” GPB data on wire can be decoded without the decoder ring while “Key-Value” GPB data is Self-Describing.
• Compact GPB can be used with UDP(default) and TCP(optionally)
• “Key-value” GPB is only for TCP
• 833 bytes of compact GPB while more than 4000 bytes for Key-value GPB
• Compressed JSON(?)