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# AI 3.8-15.1.12 Release Notes

## Summary

### Major Enhancements

* **Job Service load operations are the main focus of this release.** Throughput is improved through faster per-partition reads, better handling of transient UFS failures, and improved control of backend metadata pressure during large listing bursts.
* **Job Service load operations stability and observability** are also improved. Stop, resume, and recovery behavior is more reliable, streaming load accounting is more accurate, and operators get clearer visibility into load-operation progress and retry behavior.
* **S3 and UFS client behavior** is improved through better connection management, more consistent retry behavior, and more robust handling of interrupted or failed read requests.
* **S3 compatibility for Cloudflare R2** is improved, reducing affected read and list failures in R2 environments.
* **Cache-management correctness** is improved so stale-cache cleanup no longer evicts valid pages from lexicographically similar files such as `file1` and `file10`.

### Bug Fixes

* **Job Service load operations correctness fixes** reduce stuck or misleading progress states and improve stop and recovery behavior.
* **S3 request-path correctness fixes** improve failure handling when reads are interrupted or fail unexpectedly.
* **REST and CLI consistency** is improved so location information is reported more consistently across interfaces.

## Breaking Changes

No breaking changes in this release.

## Upgrade Notes

No migration steps are required for this release.