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**What type of PR is this?** Other **What does this PR do? Why is it needed?** Before this PR, all `.sszs` files containing the data column sidecars were read an process sequentially, taking some time. After this PR, every `.sszs` files of a given epoch (so, up to 32 files with the current `SLOT_PER_EPOCHS` value) are processed in parallel. **Which issues(s) does this PR fix?** - https://github.com/OffchainLabs/prysm/issues/16204 Tested on - [Netcup VPS 4000 G11](https://www.netcup.com/en/server/vps). **Before this PR (3 trials)**: ``` [2026-01-02 08:55:12.71] INFO filesystem: Data column filesystem cache warm-up complete elapsed=1m22.894007534s [2026-01-02 12:59:33.62] INFO filesystem: Data column filesystem cache warm-up complete elapsed=42.346732863s [2026-01-02 13:03:13.65] INFO filesystem: Data column filesystem cache warm-up complete elapsed=56.143565960s ``` **After this PR (3 trials)**: ``` [2026-01-02 12:50:07.53] INFO filesystem: Data column filesystem cache warm-up complete elapsed=2.019424193s [2026-01-02 12:52:01.34] INFO filesystem: Data column filesystem cache warm-up complete elapsed=1.960671225s [2026-01-02 12:53:34.66] INFO filesystem: Data column filesystem cache warm-up complete elapsed=2.549555363s ``` **Acknowledgements** - [x] I have read [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md). - [x] I have included a uniquely named [changelog fragment file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd). - [x] I have added a description with sufficient context for reviewers to understand this PR. - [x] I have tested that my changes work as expected and I added a testing plan to the PR description (if applicable).
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- Data column sidecars cache warmup: Process in parallel all sidecars for a given epoch.