[tracking] Investigate TM 0.35 vs 0.34

[fmorency]

TM 0.35.x was yanked.

Investigate the path of least resistance moving forward.

cf. liftedinit/roadmap#6

[fmorency]

CC @hansl

• TM 0.37 will be based on TM 0.34
• The only upgrade path supported for TM 0.37 is from TM 0.34
• TM 0.37.0-alpha.X is already released

Recommendation: We should look into migrating from 0.35 to 0.34.

TODO: Investigate the required effort to migrate from 0.35 to 0.34.

References

• Removing v0.35.x releases tendermint/tendermint#9155 (comment)
• v0.37 release plan tendermint/tendermint#9091
• https://github.com/tendermint/tendermint/releases

[hansl]

Biggest question from me would be if we can run an hybrid 0.34 and 0.35 together in the same blockchain. If so, we might just need to write a many-abci bridge that speaks 0.34 protos and restart our own nodes one by one.

[fmorency]

Update

• I was able to run a hybrid network with 3 nodes on 0.35 and 1 node on 0.34
• The 0.34 node was able to catch up with the 3 nodes on 0.35
• The resiliency tests are passing on the hybrid network
• Minor modifications are required
  • Some changes in many-abci to build against the tendermint* crates v0.25.0
  • Port the TM 0.35 configuration to TM 0.34
  • Fix p2p.max_packet_msg_payload_size to 1400 in TM 0.34 config file

[fmorency]

Update 2

• I was able to run a hybrid network with 2 nodes on 0.35 and 2 nodes on 0.34
• The 0.34 node no.2 was able to catch up with the 2 nodes on 0.35 and the one node on 0.34
• The resiliency tests are passing

Update 3

• I was able to run a hybrid network with 1 node on 0.35 and 3 nodes on 0.34
• The 0.34 node no.3 was able to catch up with the node on 0.35 and the two nodes on 0.34
• The resiliency tests are passing

[hansl]

Update

• Need to re-add block_by_hash to tendermint-rpc.
• Instructions to create an hybrid testnet 34+35
• many-abci need to be downgraded to 34.

[fmorency]

tendermint-rpc PR: informalsystems/tendermint-rs#1206
hybrid testnet: liftedinit/many-framework#254

[fmorency]

Update

• tendermint-rpc PR has been merged

[hansl]

Next step: Need to build a testnet with 0.35 and upgrade some nodes to 0.34 and let it run a bit.