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Less picky epoch changes lookup, with gap fallback #13106
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davxy
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melekes
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Jan 10, 2023
| // Tree nodes may be required while importing gap blocks. | ||
| return Ok(()) | ||
| } | ||
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This is interesting. In what circumstances we could have both gap and forktree?
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this is a really bad hack and that is the motivation that I set as draft again.
I would like to open a discussion about it. I'll ping you when I have more info
michalkucharczyk
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Jan 10, 2023
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Fix for the issue described by #12751 (comment)
In the (unlucky) event of skipped epochs, full nodes using BABE were receiving an error during the VRF output verification.
The problem was triggered because after warp sync the epoch changes data was contained within the gap structure AND (in contrast to the epoch changes tree) the gap is picky about the check. I.e. it requires that
epoch.start_slot <= slot < epoch.end_slot.Additionally we prevent epoch changes tree prune on finalization if there is something in the
gap. This is because we may require (again, after warp sync and if some epoch hash been skipped) the first tree entry during import of last gap entries.@andresilva this requires some brainstorming
I'm going to add some tests before merge