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Implement fallback blockstore #6353
Description
Summary
Lotus has a fallback blockstore that can be enabled by setting LOTUS_ENABLE_CHAINSTORE_FALLBACK=1, we need to implement the same in Forest.
The fallback blockstore uses bitswap to fetch missing blocks from the p2p network
Completion Criteria
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Activity
LesnyRumcajs commentedon Dec 16, 2025
Do you think there are some security considerations we should have in place for this feature? E.g., fetching missing blocks for random tipset that a malicious node published could potentially exhaust the node's memory/disk space, right?
hanabi1224 commentedon Dec 16, 2025
@LesnyRumcajs I think that's a valid concern. We could follow Lotus to disable this feature by default. This is useful for powering Curio tho.
0xDevNinja commentedon Dec 28, 2025
Hi, I'd like to work on this issue. Could you please assign it to me? Thanks!
hanabi1224 commentedon Jan 7, 2026
Hey @0xDevNinja thank you for your help and sorry for the late response. Yes, please go ahead with this task and let us know if you have any questions.
feat(chain-store): add fallback blockstore skeleton to support option…
chore(store): register blockstore_fallback module
docs: add optional chainstore fallback section