How to manual upgrade change denom of min_deposit gov param when it's not correct with native denom

[htiennv]

As mentioned on issue #21389, I want change denom of min_deposit gov param. Now this denom is stake not correct with native denom uduke.

Is it not possible to upgrade via proposal?

Can you suggest manual upgrade steps?

[julienrbrt]

Hey, yeah so you are stuck, you cannot do a gov proposal as 'stake' isn't a token.
You need to do the modification in an upgrade handler and upgrade the binary without upgrade gov proposal.

[glowly29]

Thanks @julienrbrt, Can you suggest me the steps to upgrade this?

[facundomedica]

There are a couple of ways you can do this, here's an example on how Evmos did it: https://github.com/evmos/evmos/pull/2589/files

Basically:

• Create a binary that schedules the upgrade (before anything in Preblocker or BeginBlocker, depending on the version you are running, v0.50+ should be Preblocker). This should be non-breaking, so validators can upgrade to this binary async, but make sure you make it to 2/3s+1 power before the upgrade height or you'll have consensus issues.

• In the upgrade handler, you should add any changes that you want to have, like (pseudo-code-ish):

params := app.govKeeper.Params.Get(ctx)
params.MinDeposit = sdk.NewCoin(10000, "blah")
app.govKeeper.Params.Set(ctx, params)

• Test, test, test. In my experience it is hard to get this right, so do a lot of testing in a local environment with at least 4 validators with %25 power each (running just one might make you think it works but it really doesn't)

• This is not the standard way to do upgrades, just a way to get you back on track. After this, you should be able to do normal gov initiated upgrades.

[htiennv]

Very useful! Thanks @facundomedica