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78 lines
3.7 KiB
Markdown
78 lines
3.7 KiB
Markdown
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# Kava 16 Upgrade Instructions
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## Software Version and Key Dates
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- The version of `kava` for Kava 16 is `v0.26.0`
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- The Kava 16 chain will be shutdown with a `SoftwareUpgradeProposal` that
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activates at approximately 15:00 UTC on TBD, 2024.
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## Dependency Changes
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## API Changes
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If you are a consumers of the legacy REST API known as the LCD, please note that this has been deprecated as a part of cosmos-sdk v47. [Additional details can be found here.](./legacy_rest.md)
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### For validators using RocksDB
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> [!NOTE]
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> If you use goleveldb or other database backends, this is not required.
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If you use RocksDB as your database backend, you will need to update RocksDB if you are using `<= v8.1.1`. The tested and recommended RocksDB version is `v8.10.0`.
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Please reference the [RocksDB repository](https://github.com/facebook/rocksdb/tree/v8.10.0) to update your installation before building the RocksDB kava binary.
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### On the day of the upgrade
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The kava chain is expected to halt at block height **xxx**. **Do not stop your node and begin the upgrade before the upgrade height**, or you may go offline and be unable to recover until after the upgrade!
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**Make sure the kava 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.
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**Ensure you are using golang 1.21.x and not a different version.** Golang 1.20 and below may cause app hash mismatches!
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To update to v0.26.0
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```sh
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# check go version - look for 1.21!
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go version
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# go version go1.21.6 linux/amd64
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# in the `kava` folder
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git fetch
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git checkout v0.26.0
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# Note: Golang 1.21 must be installed before this step
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make install
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# verify versions
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kava version --long
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# name: kava
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# server_name: kava
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# version: 0.26.0
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# commit: <commit placeholder>
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# build_tags: netgo ledger,
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# go: go version go1.21.6 linux/amd64
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# build_deps:
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# ...
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# cosmos_sdk_version: v0.47.10
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# Restart node -
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kava start
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```
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### Risks
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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.
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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.
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### Recovery
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Prior to applying the Kava 16 upgrade, validators are encouraged to take a full data snapshot at the upgrade height before proceeding. Snap-shotting depends heavily on infrastructure, but generally this can be done by backing up the .kava directory.
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It is critically important to back-up the .kava/data/priv_validator_state.json file after stopping your kava 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.
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In the event that the upgrade does not succeed, validators and operators must downgrade back to v0.25.x of the Kava software and restore to their latest snapshot before restarting their nodes.
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### Coordination
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If the Kava 16 chain does not launch by TBD at 00:00 UTC, the launch should be considered a failure. In the event of launch failure, coordination will occur in the [Kava discord](https://discord.com/invite/kQzh3Uv).
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