Substrate: Allow full and light client on-disk databases to co-exist

[expenses]

This is a nice small issue to give the light client some love. If you run the full node for a bit, then a light node with --light, you get the following error:

Error: Service(Client(Backend("Unexpected database type. Expected: light")))

It's easy enough to change the paths where the databases are put, it might be best to put the full db in /db/full/ and the light db in /db/light.

[expenses]

It's also important to consider that moving the path of the full db means that you have to add code that migrates from the old path.

[expenses]

It's easy enough to change the paths where the databases are put, it might be best to put the full db in /db/full/ and the light db in /db/light.

(Pinging to get a consensus) @seunlanlege @rakanalh @danforbes @gnunicorn I believe this would be the best way to things, anyone else have an opinion?

[rakanalh]

I think this is worth doing as i imagine there would be use cases where one would want to switch between the two.

[seunlanlege]

+1

[niklasad1]

Sounds good to me, however, duplicate of https://github.com/paritytech/substrate/issues/2204 but the description is better in this issue so feel free to close https://github.com/paritytech/substrate/issues/2204