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UPGRADING.md

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Upgrading CometBFT

This guide provides instructions for upgrading to specific versions of CometBFT.

v0.34.28

For users explicitly making use of the Go APIs provided in the crypto/merkle package, please note that, in order to fix a potential security issue, we had to make a breaking change here. This change should only affect a small minority of users. For more details, please see #557.

v0.34.27

  • Added new ABCI methods PrepareProposal and ProcessProposal. For details, please see the spec. Applications upgrading to v0.37.0 must implement these methods, at the very minimum, as described here
  • Deduplicated ConsensusParams and BlockParams. In the v0.34 branch they are defined both in abci/types.proto and types/params.proto. The definitions in abci/types.proto have been removed. In-process applications should make sure they are not using the deleted version of those structures.
  • In v0.34, messages on the wire used to be length-delimited with int64 varint values, which was inconsistent with the uint64 varint length delimiters used in the P2P layer. Both now consistently use uint64 varint length delimiters.
  • Added AbciVersion to RequestInfo. Applications should check that Tendermint's ABCI version matches the one they expect in order to ensure compatibility.
  • The SetOption method has been removed from the ABCI Client interface. The corresponding Protobuf types have been deprecated.
  • The key and value fields in the EventAttribute type have been changed from type bytes to string. As per the Protocol Buffers updating guidelines, this should have no effect on the wire-level encoding for UTF8-encoded strings.

Upgrading from Tendermint Core

If you already make use of Tendermint Core (either the original Tendermint Core v0.34.24, or Informal Systems' public fork), you can upgrade to CometBFT v0.34.27 by replacing your dependency in your go.mod file:

go mod edit -replace github.com/tendermint/tendermint=github.com/cometbft/cometbft@v0.34.27

We make use of the original module URL in order to minimize the impact of switching to CometBFT. This is only possible in our v0.34 release series, and we will be switching our module URL to github.com/cometbft/cometbft in the next major release.

Home directory

CometBFT, by default, will consider its home directory in ~/.cometbft from now on instead of ~/.tendermint.

Environment variables

The environment variable prefixes have now changed from TM to CMT. For example, TMHOME or TM_HOME become CMTHOME or CMT_HOME.

We have implemented a fallback check in case TMHOME is still set and CMTHOME is not, but you will start to see a warning message in the logs if the old TMHOME variable is set. This fallback check will be removed entirely in a subsequent major release of CometBFT.

Building CometBFT

CometBFT must be compiled using Go 1.19 or higher. The use of Go 1.18 is not supported, since this version has reached end-of-life with the release of Go 1.20.

Troubleshooting

If you run into any trouble with this upgrade, please contact us.

For historical upgrading instructions for Tendermint Core v0.34.24 and earlier, please see the Tendermint Core upgrading instructions.