PreCommitPolicy: Don't try to align expirations on proving period boundaries #7018
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Subsumes #6729 |
arajasek
commented
Aug 10, 2021
| expected := h + policy.GetMaxSectorExpirationExtension() - (pBuffer * 2) | ||
| // as set just before returning within Expiration() | ||
| expected += miner.WPoStProvingPeriod - (expected % miner.WPoStProvingPeriod) + pBoundary - 1 | ||
| expected := h + policy.GetMaxSectorExpirationExtension() - pBuffer |
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I don't know why these were subtracting out pBuffer * 2, since that isn't what the cc lifetime method seems to do.
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I did ask for extra scrutiny, but my implementation is definitely wrong here, hidden by the chosen constants. Thanks for catching this. Only rationale I can come with here was to match this but it's external to the Policy entirely. Not sure why I landed with that.
Stebalien
approved these changes
Aug 10, 2021
storage/miner.go
Outdated
| provingBoundary = md.PeriodStart % md.WPoStProvingPeriod | ||
| provingBuffer = md.WPoStProvingPeriod * 2 | ||
| cfg = sealing.GetSealingConfigFunc(m.getSealConfig) | ||
| provingBuffer = md.WPoStProvingPeriod * 2 | ||
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| // TODO: Maybe we update this policy after actor upgrades? |
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Can drop the comment. That comment was probably about removing the proving boundary (which we used to require).
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After a thorough examination of actors code, the PreCommitPolicy trying to align expirations on proving period boundaries is entirely unnecessary (and not even doing what it thinks it should be doing). Removing this also fixes #6065.
Also included in this PR is a check that the proposed PCP expiration isn't at risk of being invalidly small as a result of the PC message taking too long to land on chain. "At risk" is currently defined as "within 24 hours", though this should probably be a config setting.