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Peter Dodd
5f1a742726
A remote-only entry whose object was deleted from the remote storage outside the filer answered GET with 500 and stayed in the filer. The remote's not-found was lost on the way: the backends' ReadFile returned it as an untyped error, so FetchAndWriteNeedle failed with codes.Unknown and nothing downstream could tell it from any other failure. - remote_storage: GCS, S3 (NoSuchKey) and Azure (BlobNotFound) reads return ErrRemoteObjectNotFound. GCS reports a missing bucket the same way as a missing object, so it confirms the bucket with a listing. - volume server and filer: the not-found crosses gRPC as codes.NotFound carrying the sentinel's text, and the filer's cache RPC returns codes.NotFound, which the S3 gateway already maps to NoSuchKey. - s3api: the origin fallback answers NoSuchKey on a confirmed not-found. - filer: a confirmed not-found removes the stale entry, so the lazy remote-metadata cache converges on the remote. Only remote-only files outside .versions and without an active object lock are removed, only if unchanged since the fetch (checked on the object's write owner, under the lock S3 object writes take), and with a metadata-only delete: the filer skips its inline remote delete, and the delete events' entries carry a marker that makes filer.remote.sync and filer.remote.gateway skip their remote delete, while filer.sync still replicates it. The replicated DeleteEntryRequest carries keep_remote_object, so the destination's delete events are marked too. The store drops the marker from every write, so clients cannot plant it.