0g-chain/migrate/v0_13/migrate.md

# Kava-5 Upgrade Instructions

## Software Version and Key Dates

* The version of Kava for kava-5 is v0.13
* Kava-4 validators should prepare to shutdown their nodes March 4th, 2021 at 13:00 UTC
* Kava-5 genesis time is set to March 4th, 2021 at 15:00 UTC
* The version of cosmos-sdk for kava-5 is v0.39.2
* The version of tendermint for kava-5 v0.33.9
* The minimum version of golang for kava-5 is 1.13+, 1.15+ has been tested and is recommended.

### Risks

As a validator, performing the upgrade procedure on your consensus nodes carries a heightened risk of double-signing and being slashed. The most important piece of this procedure is verifying your software version and genesis file hash before starting your validator and signing.

The riskiest thing a validator can do is discover that they made a mistake and repeat the upgrade procedure again during the network startup. If you discover a mistake in the process, the best thing to do is wait for the network to start before correcting it. If the network is halted and you have started with a different genesis file than the expected one, seek advice from a Kava developer before resetting your validator.

### Recovery

Prior to exporting kava-4 state, validators are encouraged to take a full data snapshot at the export height before proceeding. Snap-shotting depends heavily on infrastructure, but generally this can be done by backing up the .kvd and .kvcli directories.

It is critically important to back-up the .kvd/data/priv_validator_state.json file after stopping your kvd process. This file is updated every block as your validator participates in consensus rounds. It is a critical file needed to prevent double-signing, in case the upgrade fails and the previous chain needs to be restarted.

In the event that the upgrade does not succeed, validators and operators must downgrade back to v0.12.2 of the Kava software and restore to their latest snapshot before restarting their nodes.

## Upgrade Procedure

### Before the upgrade

Set your node to produce the final block of kava-4 at __13:00__ UTC March 4th, 2021. To restart your node with that stop time,

```sh
kvd start --halt-time 1614862800
```

You can safely set the halt-time flag at any time.

### On the day of the upgrade

__The kava chain is expected to halt at 13:00 UTC, and restart with new software at 15:00 UTC March 15th. Do not stop your node and begin the upgrade before 13:00UTC on March 4th, or you may go offline and be unable to recover until after the upgrade!__

Kava developers will update this PR with the final block number when it is reached. __Make sure the kvd process is stopped before proceeding and that you have backed up your validator__. Failure to backup your validator could make it impossible to restart your node if the upgrade fails.

1. Export State (this __MUST__ be done using __v0.12.2__, previous v0.12.x versions will not produce the same genesis hash!)

```sh
kvd export --for-zero-height --height [PLACEHOLDER] > export-genesis.json
```

__Note:__ This can take a while!

2. Update to kava-5

```sh
  # in the `kava` folder
    git pull
    git checkout v0.13.0
    make install

  # verify versions
  kvd version --long
  # name: kava
  # server_name: kvd
  # client_name: kvcli
  # version: 0.13.0
  # commit: PLACEHOLDER
  # build_tags: netgo,ledger
  # go: go version go1.15.8 linux/amd64


  # Migrate genesis state
  kvd migrate export-genesis.json > genesis.json

  # Verify output of genesis migration
  kvd validate-genesis genesis.json # should say it's valid
  jq -S -c -M '' genesis.json | shasum -a 256
  # [PLACEHOLDER]

  # Restart node with migrated genesis state
  cp genesis.json ~/.kvd/config/genesis.json
  kvd unsafe-reset-all
  kvd start
```

### Coordination

If the kava-5 chain does not launch by March 4, 2021 at 17:00 UTC, the launch should be considered a failure. Validators should restore the state from kava-4 and coordinate a relaunch. In the event of launch failure, coordination will occur in the [Kava discord](https://discord.com/invite/kQzh3Uv).