branch-4.0: [fix](cloud) Fix memory leak in CloudTxnDeleteBitmapCache for empty rowsets #59710#59819
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yiguolei merged 1 commit intobranch-4.0from Jan 14, 2026
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…owsets (#59710) ### What problem does this PR solve? Related PR: #54395 Problem Summary: When skip_writing_empty_rowset_metadata is enabled, empty rowsets are not committed to meta-service. Previously, set_txn_related_delete_bitmap() would either: 1. Store full rowset info in cache (causing memory leak since sync_tablet_delete_bitmap_by_cache() never cleans it up), or 2. Skip storing entirely (causing CalcDeleteBitmapTask to fail with NOT_FOUND error) This fix introduces a lightweight marker mechanism: - For empty rowsets, store only a TxnKey marker (~16 bytes) instead of full rowset info - CalcDeleteBitmapTask checks for marker via is_empty_rowset() and returns success if found (marker is NOT removed to support task retry) - Cleanup is handled by expiration-based removal in remove_expired_tablet_txn_info() - Expiration time is consistent with set_tablet_txn_info()
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yiguolei
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Jan 14, 2026
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Cherry-picked from #59710