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Ensure custody backfill sync couples all responses before importing (#8339)

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Custody backfill sync has a bug when we request columns from more than one peer per batch. The fix here ensures we wait for all requests to be completed before performing verification and importing the responses.

I've also added an endpoint `lighthouse/custody/backfill` that resets a nodes earliest available data column to the current epoch so that custody backfill can be triggered. This endpoint is needed to rescue any nodes that may have missing columns due to the custody backfill sync bug without requiring a full re-sync.


  


Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com>

Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu>

Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>
This commit is contained in:
Eitan Seri-Levi
2025-11-03 00:06:06 -08:00
committed by GitHub
parent 4908687e7d
commit 5d0f8a083a
11 changed files with 230 additions and 24 deletions
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@@ -447,6 +447,16 @@ indicating that all states with slots `>= 0` are available, i.e., full state his
on the specific meanings of these fields see the docs on [Checkpoint
Sync](./advanced_checkpoint_sync.md#how-to-run-an-archived-node).
## `/lighthouse/custody/backfill`
Starts a custody backfill sync from the next epoch with the node's latest custody requirements. The sync won't begin immediately, it waits until the next epoch is finalized before triggering.
This endpoint should only be used to fix nodes that may have partial custody columns due to a prior backfill bug (present in v8.0.0-rc.2). Use with caution as it re-downloads all historic custody data columns and may consume significant bandwidth.
```bash
curl -X POST "http://localhost:5052/lighthouse/custody/backfill"
```
## `/lighthouse/merge_readiness`
Returns the current difficulty and terminal total difficulty of the network. Before [The Merge](https://ethereum.org/en/roadmap/merge/) on 15<sup>th</sup> September 2022, you will see that the current difficulty is less than the terminal total difficulty, An example is shown below: