## EPF5 Dev Updates - Week 18 [◀️ *previous update*](https://hackmd.io/@hangleang/epf5-week17) ### Goals For This Week - [x] reconstruction data columns if more than half columns available ### Activities - `peerdas-devnet-3` has been [launched](https://peerdas-devnet-3.ethpandaops.io/) with [the same specs](https://notes.ethereum.org/@ethpandaops/peerdas-devnet-3) as `peerdas-devnet-2` and update validation rules on invalid data column sidecars on block withno blobs - after running for a while, the network splits into many forks; prysm, lodestar, and some of teku nodes able to stay together; lighthouse and nimbus decide to stay with only its own client, while grandine created many forks as possible, or I can say 1 node per fork, can't even stay together with its own client - decided to focus mainly on implementing [reconstruction missing columns when half of columns available](https://github.com/ethereum/consensus-specs/blob/dev/specs/_features/eip7594/das-core.md#reconstruction-and-cross-seeding) with these following commits: [check and trigger the reconstruction](https://github.com/hangleang/grandine/commit/b02e30280e204cc391fb88455781534b7f8985c6) and [handle reconstructed columns and propagate](https://github.com/hangleang/grandine/commit/4c01f1e9f1715236bec7f2afb7395c85d75efc79) - built new image with the reconstruction logic, and joined the `peerdas-devnet-3` with 1 supernode and 1 fullnode to reproduce the problem on the real network, but seems the issue that grandine facing in the current devnet, is not the missing of reconstruction implement, but more on sync issue related which it was happened since `peerdas-devnet-0`. for more info and debugging purpose, anyway I will try to check out the [full logs of the nodes](https://drive.google.com/drive/folders/1gLHfNRIap6miGFLyESNnwbcQxvcyCvqR?usp=sharing) when tring to sync from the genesis with current running devnet ### Plan For Next Week - debug on the logs from the running network to identify the issues - fix the issues accordingly based on priority --- [▶️ *next update*](https://hackmd.io/@hangleang/epf5-week19)