feat: Reduce the size of the assignment by dropping the last block hash#27
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…k_hash Reads a flatbuffer assignment, rebuilds it using the builder API with last_block_hash set to empty string on every chunk, preserving all other fields and worker data. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
… in the assignment
kalabukdima
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May 20, 2026
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As discussed - the portal only needs hashes for the head of the dataset, so pushed the change to conditionally set hashes to |
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Closes: NET-585
What is this PR about?
last_block_hashis stored per chunk in the assignment to verify chunk continuity. However, given the current hash format, it occupies a significant amount of space. This PR adds aclear_last_block_hashconfig option that skips generating the hash. This requiresstrict_continuity_checkto be disabled, but reduces the assignment size substantially.Example (mainnet, May 2026):
Updated: conditional last_block_hash call:
722 MB Flatbuffer
319 MB Gzipped
How does it work?
clear_last_block_hash: booladded to the scheduler config. Whentrue,encode_fbwrites actual hashes only for the last chunks in the dataset.src/lib.rsextracted so tools can depend on the main crate.clear-block-hashCLI utility is included for rewriting existing assignments with the hash cleared, useful for evaluating the impact before enabling in production.Running the tool