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Zhengchao An
74be040c62
* feat(ecstore): add on-demand migration backfill job core Add the background backfill job for on-demand migration (rustfs/backlog#2159): a durable checkpoint under buckets/<bucket>/on-demand-migration-backfill.json saved by If-Match compare-and-set every 1000 keys or 10 s, a 60 s owner lease renewed by every save, a recovery pass that takes over expired leases (or jobs this node owned before a restart) and cancels jobs whose config changed, and a main loop over the source ListObjectsV2 pages with the skip_existing policy, dry runs, bounded outstanding pulls and wait-on-full enqueueing. The pull queue gains per-job completion reports so the job can count pulled/failed keys (hashes only), and pull permits become two-tier so an online miss is never queued behind a backfill pull. * feat(admin): expose on-demand migration backfill job Wire the ODM-12 backfill job (rustfs/backlog#2159) to its operators: POST /v3/on-demand-migration/{bucket}/backfill?op=start|cancel and GET .../backfill return the checkpoint document, GET .../status gains a backfill summary, and the recovery loop plus the process-wide runner are installed at startup. Backfill control reuses Set/GetBucketOnDemandMigrationAction and is recorded in the route policy, the registration matrix and the admin route snapshot. Add the rustfs-madmin wire types and client methods with golden fixtures shared by the server tests, the backfill_* metric descriptors and their collector, and three e2e scenarios: a full backfill across list pages, cancellation, and resuming from the persisted continuation token after a server restart.