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fix: split blocks at gap in import - #2522

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wgr523 wants to merge 1 commit into
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split-at-gap-in-import
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fix: split blocks at gap in import#2522
wgr523 wants to merge 1 commit into
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split-at-gap-in-import

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@wgr523

@wgr523 wgr523 commented Aug 14, 2026

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Proposed changes

in order to fix fastsync snapshot err, when inserting a batch of blocks, it split the batch into multiple batches that do not contain gap block inside (except for boarder).

tested on a mainnet fast sync new node

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  • This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
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in order to fix fastsync snapshot err
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Pull request overview

Splits downloaded block imports at XDPoS gap blocks to ensure snapshots exist before subsequent header verification.

Changes:

  • Adds gap-aware block segmentation.
  • Imports each segment sequentially with existing error handling.

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// block's snapshot exists before the next segment's headers are verified. For
// non-XDPoS chains (or when there is nothing to split) the whole batch is
// returned as a single segment.
func (d *Downloader) splitBlocksAtGap(blocks []*types.Block) [][]*types.Block {
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