branch-4.1: [improvement](recycler) Avoid single-point read/write during sequentially reading key #62476#63123
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…ally reading key (#62476) fix: #58459 This PR reduces point-read overhead in Cloud recycler rowset cleanup. Previously, each scanned rowset could immediately trigger metadata reads/writes to mark it as recycled or abort its related transaction/job. The new flow records rowset keys during scanning, then batch-processes recycled marks and deferred abort tasks in worker batches. Prepare rowset deletion is also deferred so the recycler re-reads the latest metadata before deleting data. This keeps the existing recycle safety semantics while reducing per-rowset KV operations during large recycle scans. **Release mode test** Recycling 10,000 rowsets, after enabling `enable_mark_delete_rowset_before_recycle` and `enable_abort_txn_and_job_for_delete_rowset_before_recycle`, the processing time increased by approximately 10%. **3514 ms -> 175 ms(mark) + 3811(abort and recycle)**
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yiguolei
approved these changes
May 11, 2026
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Cherry-picked from #62476