Fix partial-blocks streaming: undo on reorg, no gaps, no stream errors#799
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🔍 Vulnerabilities of
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| digest | sha256:ca6fb4f6be8eca92e5561f78f9e9169dcadebeb62d00976b5f06ed6b665cdc58 |
| vulnerabilities |     |
| platform | linux/amd64 |
| size | 119 MB |
| packages | 353 |
📦 Base Image ubuntu:24.04
| also known as |
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| digest | sha256:023f8a753c22258c9fe2d0005a7d28258038da7d620e9f93e9ad78aa266f9f11 |
| vulnerabilities |    |
A partial block that does not extend the transactions already sent now triggers a BlockUndoSignal (last valid = parent) instead of killing the stream with 'first transactions does not match expected hash'. After such an undo, further non-last partials of that block are muted until its last partial or full block settles it, so churning versions produce a single undo. Repeated undos to the same junction are no longer suppressed once partial data has been sent.
Brings streamingfast/bstream#49: the hub subscription no longer skips past a StepNewPartial under subscriber lag, and the forkable ignores non-last partial versions of a block already settled by its lastPartial. This also guarantees a partial block is never delivered before its parent, so the pipeline needs no parent-link checking of its own.
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maoueh
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Jun 10, 2026
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With
--partial-blocks, a flashblock reorg could kill the stream withfirst transactions does not match expected hashor emit erratic UNDO signals. Fixed behavior:BlockUndoSignal(last valid = parent block) instead of anInternalerror; further non-last partials of that block are then muted until its last partial (or full block) settles itAlso bumps bstream to include streamingfast/bstream#49 (live streams no longer lose the closing
StepNewPartialof a block — the root trigger of these conditions). That fix also guarantees a partial is never delivered before its parent block, so no parent-link checking is needed pipeline-side.🤖 Generated with Claude Code