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Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
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6fb21c9ec0 |
filer: copy a remote-only entry on the remote when renaming it (#11709)
* filer: copy a remote-only entry on the remote when renaming it
Renaming a file under a remote.mount whose content exists only on the
remote (never cached, or remote.uncache'd) lost it: the new entry kept
the old RemoteEntry, deleting the old entry deleted the old object, and
with no chunks nothing ever wrote the new key. filer.remote.sync could
not finish the rename either, since the old object was already gone.
moveSelfEntry now copies such an entry's object to the new key before
it touches anything, and the new entry gets the RemoteEntry of the
copy. The copy is a new optional RemoteStorageObjectCopier interface,
implemented for S3 with CopyObject up to 5 GB and UploadPartCopy above
that; the multipart copy carries the source's metadata and, where the
remote supports tagging, its tags. When an existing target is
overwritten, its delete keeps the remote object (the copy replaced it)
and its event is marked metadata-only so the sync leaves it alone too.
A remote-only rename that leaves its mount, or whose remote cannot
copy, is refused instead of deleting the only copy. Empty entries and
entries with local data rename as before.
UpdateFileMetadata builds its copy source with the same helper, which
escapes each key segment and keeps the slashes.
* filer: delete a copied rename's old object only after the commit
Review follow-ups:
- The old key of a copied remote-only entry, and the old directory of a
rename that copied one, are now deleted once the rename has committed.
A rename that fails after the copy leaves the source entry and its
object in place, plus an extra object at the new key.
- Every part of a multipart copy is conditioned on the ETag the copy
started from, so an object overwritten mid-copy fails the copy
instead of mixing versions.
- Both copy paths keep the source's server-side encryption settings.
- filer.remote.sync no longer deletes a key that a remote-only entry
holds by the time the delete event is processed: a file deleted and
then replaced by a remote-only rename has its content only there.
* filer: do not sweep the old prefix of a directory rename that copied
Removing the old directory on the remote deletes everything under its
prefix. Run after the commit, that could also take an object another
rename copied in under the same path meanwhile. When a child was copied,
leave the prefix alone and delete only the copied children's old keys.
* filer: keep an old key a remote-only entry has retaken by cleanup time
A directory rename does not lock its children's paths, so between the
commit and the deferred delete of a copied child's old key another
rename can put a remote-only entry there, whose content is then only in
that object. Check the store before deleting.
* filer: keep a renamed entry's old object when the path lookup fails
The deferred delete must only run once the lookup shows no remote-only
entry at the old path. A failed lookup shows nothing, and an extra
object loses nothing.
* filer: copy over a remote-only rename target only after the commit
Copying the source object onto the target's key before the transaction
committed destroyed the target's only content, which a rolled-back
commit cannot restore. When the target is remote-only the copy now runs
after the commit: the new entry keeps the old key's stamp until the copy
lands and re-stamps it, the target's object is kept meanwhile, and a
failed copy keeps the old object so remote.sync can finish it.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* remote.sync: match the delete event's etag before deleting the object
A rename can copy another entry's content onto a key between the filer's
check and the remote delete, and the delete then removes the copy. The
delete event carries the object's etag; delete only when the live object
still matches it.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* filer: finish a rename's remote work outside the committed transaction
The SQL stores keep the transaction in the context and refuse every
call through it once it has committed. The work that runs after
CommitTransaction used that context, so on postgres2 the deferred
old-key delete could not look up the old path and kept the object, and
finishRemoteCopies could not read or stamp the entry. Both failed with
"sql: transaction has already been committed or rolled back" on every
copied rename; remote.sync cleaned up after them.
Keep the context from before the transaction for the work after the
commit. The rename test store gets a strict mode that fails calls
through a committed transaction the way database/sql does.
* filer: carry a deferred copy's stamp in the rename event; delete orphaned uploads
- The deferred copy stamps the entry with a plain UpdateEntry, which
publishes no event, so the queued rename event still carried the old
key's stamp to peer filers and subscribers. Give it the copy's
RemoteEntry before it is sent. The two notify loops share the code now.
- remote.sync kept any object whose ETag changed since the delete. With
no entry at the path that is an upload which finished after the
delete, and keeping it leaves it on the remote for good. Look up the
path first and keep a changed object only when an entry holds it.
* remote.sync: keep a changed object even with no entry at its path
Deleting a changed object when no entry holds the path also deletes a
copy a directory rename has written but not yet made visible, while a
delete of that path waits in the sync; the rename then removes the old
key and the content is gone. Keep any object whose ETag changed since
the delete, as before. An upload that finishes after the delete leaks
its object instead, which is the cheaper failure.
* filer: read a pending remote rename copy from the source key
A remote-only rename over a remote-only target commits before its copy
lands, so reads on the new path served the target's old object until the
copy stamped the entry — and indefinitely when the copy failed without
remote.sync running. The committed entry now records the renamed-from
path, and remote-only reads resolve that object's key while the stamp
is pending; the copy's stamp and the sync's completion stamp both clear
the marker.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* filer: stamp the rename event with the deferred copy's result
A remote-only rename over a remote-only target queued the new entry's
event with the source's stamp before the deferred copy ran. Peers
replaying it saved a stamp the copy had already superseded, and the
sync serving such a peer rejected the destination as a match and tried
to copy the deleted source. The event now carries the copy's result
and drops the pending-source marker once it lands.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* remote.sync: delete only the object the event's stamp describes
An object at a deleted key is not always the one the delete meant: a
rename copy can land before its filer entry is visible, and a rewrite
can upload over it. When the event recorded no remote stamp, or the
live stat cannot confirm the recorded etag, the delete now keeps the
object instead of treating it as a late upload.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* filer: tighten the pending rename source marker
Follow-ups to reading a pending remote rename copy from its source key:
- Only the filer sets the marker. The HTTP upload and tagging handlers
store Seaweed-* request headers as extended attributes, so they skip
this one, and a marker that leads out of the entry's own mount is
ignored, so it cannot point reads at another remote.
- A pending entry renamed again copies from the marker's source, not
from its own key, which still holds the old target's bytes. A further
deferred rename keeps naming the original source; an immediate copy
clears the marker.
- When remote.sync finds the destination already holding the content,
it stamps the entry (clearing the marker) before deleting the source,
and deletes the source only once the entry no longer reads it.
- A read that resolved the source just before the copy finished and
the source went away retries with the entry as it is now.
* filer, remote.sync: follow a pending rename's source across renames
When a remote-only entry is renamed over another remote-only file and
the deferred copy fails, it reads the source key through its marker.
Renamed again the same way, the marker keeps naming that source, but:
- remote.sync completed each rename from the event's old key. For the
second one that is the first target's old object, which it copied
over the destination before clearing the marker. It now copies from
the source the entry's marker names.
- For the first rename it found no entry at the new path and deleted
the old key, which the later entry still reads. When the event's new
entry carried a marker and the path is gone, it now leaves the key to
the entry that moved on.
- When the filer copies a pending entry immediately on a later rename,
it now also releases the source the copy read, after the commit and
with the same checks as the old key.
* remote.sync: release a pending rename's source, the filer leaves it
The filer deleted a pending entry's source after copying it on a later
rename, but that rename locks only its own paths: another rename can
copy onto the source key before its entry is visible, and the cleanup
then deleted that copy. And deleting a pending entry never released its
source at all.
The filer now leaves marked sources alone. remote.sync releases one
when the pending entry is deleted, or when a later rename was copied
right away, and only while the live object is still the one the
entry's stamp describes and no remote-only entry holds the path: a
copy that landed there since has a different ETag and is kept.
* remote.sync: release a pending source when the renamed entry is cached
A rename copied right away left its pending source to remote.sync,
which released it only while the destination was still remote-only.
Cached before the sync got there, the destination took the other path
and the source stayed on the remote for good. Release it there too,
with the same checks.
* remote.sync: release a pending source only after the destination is safe
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Chris Lu
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63d2024b82 |
filer.remote.sync: upload a rewrite that lands in the remote mtime's second (#11715)
* filer.remote.sync: resolve same-second updates with the sync stamp shouldSendToRemote compared remote_mtime to the entry mtime in whole seconds, so a rewrite landing in the same second as the previous upload was dropped and never retried. When the two seconds are equal, fall back to the full-precision LastLocalSyncTsNs stamp, the same check remote.uncache uses to refuse uncaching an unsynced entry. An entry without the stamp is treated as unsynced and sent. Fixes #11713 * filer.remote.sync: restamp the entry after a metadata-only remote update A same-second metadata edit now reaches UpdateFileMetadata, but without advancing LastLocalSyncTsNs the entry stays dirty and every later event re-sends the metadata update. Stamping it through updateLocalEntry keeps the same IF_ENTRY_EQUAL guard as an upload stamp. * filer.remote.sync: stamp a cloned RemoteEntry in updateLocalEntry Callers can pass the event's own RemoteEntry; mutating its stamp before the expected entry is cloned put the new stamp into IF_ENTRY_EQUAL while the filer still holds the old one, so every restamp was rejected as stale. Stamping a clone keeps the precondition on the stored stamp and leaves the caller's RemoteEntry untouched. |
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Peter Dodd
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5f1a742726 |
fix: return NoSuchKey and drop stale entries when a remote-mounted object is gone from the remote (#11680)
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. |
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68df7511f6 |
filer.remote.sync: do not pin the sync offset on completed work (#11569)
* filer.remote.sync: do not pin the sync offset on completed work * filer.remote.sync: a superseded rename uploads the current entry; typed NotFound for a stamp on a deleted entry * filer.remote.sync: a superseded rename keeps the old key when it is the only copy and uploads once * filer.remote.sync: a rename whose content is now remote-only fails the event instead of completing it * filer.remote.sync: a remote-only rename copies the old object to the destination before deleting it * filer.remote.sync: the remote-only rename path follows the filer's current entry and verifies the destination object * filer.remote.sync: an event that described an entry without data is superseded once the filer wrote to it * filer.remote.sync: a superseded rename does only the work left to do uploadCurrentEntry met a remote-only current entry with a fixed error, but a sync plus remote.uncache in the meantime leaves the destination holding the stamped object; that state is complete, not lost. The remote-only case now finishes through completeRemoteOnlyRename, which verifies the destination against the entry stamp and fails only when neither key holds the content. A current entry whose stamp covers its content was already uploaded by the superseding event; skip it instead of writing the same bytes again. * filer.remote.sync: an inherited stamp does not prove the content synced The stamp-coverage skip in uploadCurrentEntry read LastLocalSyncTsNs as proof the current content was uploaded, but a rename carries the source entry's stamp to the destination: a rewrite hidden by that stamp (the case the fallback upload exists for) carries a LastLocalSyncTsNs at or after its mtime and would have been skipped. Drop the check; the remote-only path verifies content at the destination itself through describes. --------- Co-authored-by: James Sas <james@medable.com> Co-authored-by: Chris Lu <chris.lu@gmail.com> |
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jsasandChris Lu
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5b79f51e3c |
filer.remote.sync: stamp entries with IF_CHUNKS_EQUAL so a stale write-back cannot delete live chunks (#11435)
* filer.remote.sync: stamp entries with IF_CHUNKS_EQUAL so a stale write-back cannot delete live chunks updateLocalEntry records the RemoteEntry stamp after an upload by writing the event's entry back with UpdateEntry. The filer deletes every stored chunk absent from an updated entry, so when the file was rewritten while its upload was in flight (or the event is a replay), the stale snapshot deletes the rewrite's chunks: the entry then points at the new fid with no needle behind it, and the rewrite's own upload fails and is skipped as superseded. The stamp write now carries WriteCondition IF_CHUNKS_EQUAL over the event's chunk fids, evaluated by the filer under the path lock. A refused stamp means the filer moved past this event; the superseding event follows in the log and stamps the current entry, so the refusal is logged and skipped like a superseded upload. Reproduction: weed server -filer plus a weed server -s3 remote, remote.mount, filer.remote.sync; hold the remote (docker pause) so one upload stays in flight, rewrite the file through the filer, unpause. Before: the entry's chunk is 404 on every volume server. After: the stale stamp is refused, the rewrite's chunk stays live and reads back after a vacuum. * filer.remote.sync: stamp entries with IF_ENTRY_EQUAL so stale inline content or metadata cannot be restored The IF_CHUNKS_EQUAL guard compared only the chunk fid multiset, so a rewrite that touched inline content or metadata alone still compared equal and the stale snapshot overwrote the live entry. The new clause compares the whole stored entry against the event's entry under the same path lock. * filer: route conditional UpdateEntry to the entry's owner filer Two filers locking the same path locally could still pass a stale condition on the non-owner while the owner's entry had moved on. When a condition or expected_extended precondition is set, forward the request to the entry's owner the same way conditional CreateEntry does, with is_moved bounding the hop. * filer: compare IF_ENTRY_EQUAL against the normalized expected entry FindEntry grows FileSize to the chunk extent, so a raw event entry with FileSize still zero failed the condition on an unchanged file and the stamp was skipped, letting a replay upload the object again. * filer.remote.sync: classify refused stamps by gRPC status only A FailedPrecondition substring in an unrelated error would have been swallowed as a skipped stamp; status.FromError already unwraps. * remote sync: keep the event entry intact for IF_ENTRY_EQUAL --------- Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com> |
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Chris Lu
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80dae68dbf |
fix: write the new key when a remote-synced file is renamed (#11270)
* refactor: extract update event handling into processUpdateEvent Pull the OldEntry/NewEntry update branch of the remote sync event processor into its own function so the rename skip logic can be exercised by tests with stub clients. No behavior change. * test: reproduce remote sync rename dropping the new key A rename under a remote mount arrives as an update whose NewEntry inherits the source RemoteEntry. shouldSendToRemote returns false for it, so processUpdateEvent skipped the event without writing the new key, while the filer had already deleted the old object. The test runs such an event through processUpdateEvent and expects both a delete of the old key and a write of the new one. Fails before the fix. See #11261. * fix: write the new key when a remote-synced file is renamed A rename under a remote mount arrives as an update whose NewEntry inherits the source RemoteEntry, so shouldSendToRemote returns false (RemoteMtime >= Mtime) and processUpdateEvent skipped the event. That skip is only valid when the destination key is unchanged; a path change always needs a write, and the delete-old/write-new handling below the early return is exactly what a rename needs. Guard the skip with proto.Equal(oldDest, dest) so a rename falls through to it. Fixes #11261. * fix: skip empty upload when renaming a remote-only entry A remote-only entry (no local chunks or content, data lives only on the remote object) carries a positive RemoteSize but nothing for NewFileReader to read. After the previous commit lets a rename fall through to the delete-old/write-new path, such a rename would upload EOF and create a zero-byte object at the new key, then stamp it as synced. Guard the write so a path change on a remote-only entry skips the upload instead of replacing the file with zero bytes. The filer has already deleted the old object, so the data is gone regardless; this avoids leaving a misleading empty object behind. * fix: propagate old-key delete errors except already-deleted When deleting the old key on a rename fails for a non-multipart entry, the error was swallowed and the write proceeded, which could leave both remote keys. Return the error so MetadataProcessor retries the event. The filer deletes the source remote object synchronously during the rename, so the sync delete is redundant and the object may already be gone. GCS reports that as ErrRemoteObjectNotFound (unlike S3/Azure, whose deletes are idempotent), so treat it as a successful deletion and continue to retriedWriteFile rather than pinning the sync offset. |
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Chris Lu
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ed9d58873e |
filer.remote.sync: skip an upload whose source entry was deleted or rewritten (#11149)
* filer.remote.sync: skip an upload whose source entry was deleted or rewritten A replay from an earlier offset (-timeAgo) re-emits create and update events for entries the filer has since deleted or rewritten. Their chunks are gone from the volume servers, so the upload can never succeed, and failing the event holds the sync offset before it: every restart of the subscription replays it into the same dead chunks, and progress on everything after it in the log is never persisted. One such entry stops replication for the whole mount. When the upload fails, look the entry up on the filer. Gone, or holding other content than the event described, the event is superseded and is skipped with an error log; the event that superseded it follows in the log and brings the remote to the current state. Otherwise the failure stands and the event is retried as before. Fixes #11148 * filer.remote.sync: compare chunks by file id when deciding an event is superseded filer.IsSameData compares chunk ETags, so a delete-and-recreate of identical bytes, which stores the same content under new file ids and drops the old ones, looked still as described and kept failing the event on its dead chunks. Compare by file id with DoMinusChunks, the way the filer itself decides which chunks an update leaves for deletion: the event is superseded when the current entry no longer references every chunk it named, and still as described when it does, including when more chunks were appended after it. * filer.remote.sync: ask the filer on the first failed upload attempt, not after the backoff The superseded check ran after util.Retry had given up, so every dead entry still cost the full retry cycle, about 13s, before it was skipped: the SDK reports a missing chunk as "RequestError", which IsTransientError takes as worth retrying. Move the check into the retry loop with util.RetryOnError. Any failed attempt asks the filer, and the loop stops at once when the entry is gone, surfacing errSuperseded for the caller to skip. An entry the filer still holds keeps the retry policy it had. filer.remote.gateway shares retriedWriteFile and the same offset-pinning processor, so its three call sites skip a superseded event the same way. |
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Chris LuandDevin
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9fef11526e |
filer.remote.sync: confirm a missing RemoteEntry against the filer before re-uploading (#11146)
* filer.remote.sync: confirm a missing RemoteEntry against the filer before re-uploading The event is the entry as it was when the update was logged. A chmod or utimes right after a write is logged while the sync is still uploading the write, so it carries no RemoteEntry even though the object is on the remote by the time it is processed. Gating on the event alone turned every such update into a delete and a second upload of the same bytes; cp -p, rsync and Django's FileSystemStorage all write that way. Look up the filer's current entry when the event has no RemoteEntry: the upload stamps it as soon as it completes, so the stamp is there for the race and absent for a file that was never replicated. Skip the update when the entry has since been deleted rather than upload from chunks that may be gone; the delete event that follows removes the remote object. Tests build entries from chunks, which is what IsSameData compares in production, and cover both no-RemoteEntry cases through a stub filer. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * filer.remote.sync: do not delete the remote object before overwriting it in place The update write path deleted the old object and then wrote the new one, even when both are the same key. S3, GCS and Azure all overwrite on write, so the delete bought nothing and left the remote with no object between the two calls, or at all if the write then failed and pinned the offset. On a versioned remote bucket it also left a delete marker per rewrite. Delete only when the key changes, which is what the delete was for. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * filer.remote.sync: trim comments Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> |
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Alex K
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c9c6e6fb1d |
filer.remote.sync: upload files that were never replicated (#11140)
An entry whose content is rewritten unchanged before it first reached the remote took the metadata-only branch, and UpdateFileMetadata returns early when the extended attributes match without checking that the object is there. shouldSendToRemote had already reported the entry as needing to be sent, so the effect was that it stayed local for as long as its content did not change, with the sync reporting healthy progress over it. Require RemoteEntry to be set before treating an update as metadata-only. Gating at the caller covers the S3, GCS and Azure clients, which share the same early return. Fixes #11139 |
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Chris Lu
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51ec0d2122 |
fix(remote_gateway): prevent double-versioning when syncing to versioned central bucket (#8710)
* fix(remote_gateway): prevent double-versioning when syncing to versioned central bucket
When a file is uploaded to a versioned bucket on edge, SeaweedFS stores
it internally as {object}.versions/v_{versionId}. The remote_gateway was
syncing this internal path directly to the central S3 endpoint. When
central's bucket also has versioning enabled, this caused central to
apply its own versioning on top, producing corrupt paths like:
object.versions/v_{edgeId}.versions/v_{centralId}
Fix: rewrite internal .versions/v_{id} paths to the original S3 object
key before uploading to the remote. Skip version file delete/update
events that are internal bookkeeping.
Fixes https://github.com/seaweedfs/seaweedfs/discussions/8481#discussioncomment-16209342
* fix(remote_gateway): propagate delete markers to remote as deletions
Delete markers are zero-content version entries (ExtDeleteMarkerKey=true)
created by S3 DELETE on a versioned bucket. Previously they were silently
dropped by the HasData() filter, so deletions on edge never reached
central.
Now: detect delete markers before the HasData check, rewrite the
.versions path to the original S3 key, and issue client.DeleteFile()
on the remote.
* fix(remote_gateway): tighten isVersionedPath to avoid false positives
Address PR review feedback:
- Add isDir parameter to isVersionedPath so it only matches the exact
internal shapes: directories whose name ends with .versions (isDir=true),
and files with the v_ prefix inside a .versions parent (isDir=false).
Previously the function was too broad and could match user-created paths
like "my.versions/data.txt".
- Update all 4 call sites to pass the entry's IsDirectory field.
- Rename TestVersionedDirectoryNotFilteredByHasData to
TestVersionsDirectoryFilteredByHasData so the name reflects the
actual assertion (directories ARE filtered by HasData).
- Expand TestIsVersionedPath with isDir cases and false-positive checks.
* fix(remote_gateway): persist sync marker after delete-marker propagation
The delete-marker branch was calling client.DeleteFile() and returning
without updating the local entry, making event replay re-issue the
remote delete. Now call updateLocalEntry after a successful DeleteFile
to stamp the delete-marker entry with a RemoteEntry, matching the
pattern used by the normal create path.
* refactor(remote_gateway): extract syncDeleteMarker and fix root path edge case
- Extract syncDeleteMarker() shared helper used by both bucketed and
mounted-dir event processors, replacing the duplicated delete + persist
local marker logic.
- Fix rewriteVersionedSourcePath for root-level objects: when lastSlash
is 0 (e.g. "/file.xml.versions"), return "/" as the parent dir instead
of an empty string.
- The strings.Contains(dir, ".versions/") condition flagged in review was
already removed in a prior commit that tightened isVersionedPath.
* fix(remote_gateway): skip updateLocalEntry for versioned path rewrites
After rewriting a .versions/v_{id} path to the logical S3 key and
uploading, the code was calling updateLocalEntry on the original v_*
entry, stamping it with a RemoteEntry for the logical key. This is
semantically wrong: the logical object has no filer entry in versioned
buckets, and the internal v_* entry should not carry a RemoteEntry for
a different path.
Skip updateLocalEntry when the path was rewritten from a versioned
source. Replay safety is preserved because S3 PutObject is idempotent.
* fix(remote_gateway): scope versioning checks to /buckets/ namespace
isVersionedPath and rewriteVersionedSourcePath could wrongly match
paths in non-bucket mounts (e.g. /mnt/remote/file.xml.versions).
Add the same /buckets/ prefix guard used by isMultipartUploadDir so
the .versions / v_ logic only applies within the bucket namespace.
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