New design for blob/column pruning #8266
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Open PRs to include for the release - #7907 - #8247 - #8251 - #8253 - #8254 - #8265 - #8269 - #8266 Co-Authored-By: Jimmy Chen <[email protected]> Co-Authored-By: Jimmy Chen <[email protected]>
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Issue Addressed
We are seeing some crazy IO utilisation on Holesky now that data columns have started to expire. Our previous approach of iterating the entire blobs DB doesn't seem to be scaling.
Proposed Changes
New blob pruning algorithm that uses a backwards block iterator from the epoch we want to prune, stopping early if an already-pruned slot is encountered.
Additional Info
This is incompatible with intentionally gappy blob DBs, which we have thought about trying to support but have no near-term plans of implementing. We could probably make gappy DBs work by reverting to the more inefficient pruning.