fix(miner): ignore lastWork when selecting the best mining candidate #12690
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Previously, we only took the new head if it's heavier than the last head. Unfortunately, this meant that F3 finalization wasn't properly propagated to the miner. In terms of impact: 1. It seems likely that this check was simply defensive as, prior to F3, the new head should never have a lower weight (unless you're talking to multiple lotus nodes, I guess...). 2. The `lastWork` field is mostly used to track null blocks. Worst-case scenario, if we switch heads, we'll attempt to re-mine previous heights. However, that should be relatively fast and, due to the slash filter, we won't attempt to re-broadcast any of those blocks. Signed-off-by: Jakub Sztandera <[email protected]>
Signed-off-by: Jakub Sztandera <[email protected]>
We also perform this check inside `SyncSubmitBlock` so we did have an effective filter, but this was still wrong. Signed-off-by: Jakub Sztandera <[email protected]>
masih
approved these changes
Nov 12, 2024
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I think this may have introduced a shutdown race that's caused at least one flaky test in CI: https://github.com/filecoin-project/lotus/actions/runs/11851664737/job/33028560392#step:9:1189 I can't come up with a theory about why that might be new with this change because I can imagine how it could happen with the older code (not checking |
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Orginal PR #12659
This PR extracts only miner changes as #12659 also makes changes in sync which require more
development and testing.