The change was bringed in 2.6.4 or earlier, the version number was split into 
two parts:
1.`getVersion()`, which is the only version used in Dubbo before 2.6.4, it 
represents the version of the jar package or the version number stored in 
MANIFEST.MF. This version will change along with each release.
2. `getProtocolVersion()`, newly created to represent the RPC protocol version, 
it will only change when there's incompatible RPC protocol upgrades.

I would suggest that `getProtocolVersion()` only being used internally by Dubbo 
framework itself. 

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2698 ]
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