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fix: reuse validated latest state without rescanning version history

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Signed-off-by: Feng Ruohang <rh@vonng.com>
This commit is contained in:
Feng Ruohang
2026-10-25 13:02:23 +08:00
parent 1865985aa1
commit 03875d61e3
3 changed files with 14 additions and 31 deletions
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cmd/erasure-object.go
+1 -1
View File
@@ -997,7 +997,7 @@ func (er erasureObjects) getObjectFileInfo(ctx context.Context, bucket, object s
rw.Lock()
// when its a versioned bucket and empty versionID - at totalResp == setDriveCount
// we must use rawFileInfo to resolve versions to figure out the latest version.
if opts.VersionID == "" && totalResp == er.setDriveCount && !uniformLatestVersion(rawArr, metaArr, errs) {
if opts.VersionID == "" && totalResp == er.setDriveCount && !uniformLatestVersion(metaArr, errs) {
fi, onlineMeta, onlineDisks, modTime, etag, err = calcQuorum(pickLatestQuorumFilesInfo(ctx,
rawArr, errs, bucket, object, readData, opts.InclFreeVersions))
} else {
cmd/object-mutation-consistency_test.go
+1 -1
View File
@@ -138,7 +138,7 @@ func TestMutationVersionHistoryRead(t *testing.T) {
}
meta[i], errs[i] = fileInfoFromRaw(raw[i], bucket, object, false, false)
}
return uniformLatestVersion(raw, meta, errs)
return uniformLatestVersion(meta, errs)
}
if !uniform() {
t.Fatal("healthy version history requires redundant full metadata decoding")
cmd/object-mutation.go
+12 -29
View File
@@ -194,37 +194,20 @@ func (s *xlStorage) undoWrite(ctx context.Context, volume, path string, fi FileI
return nil
}
// All drives have replied. A uniform indexed latest version may avoid the
// second metadata decode, including healthy version histories. Conflicts retain
// the full merge. Exact FileInfo comparison also prevents the four-byte header
// signature from being treated as a collision-free identity.
func uniformLatestVersion(raw []RawFileInfo, meta []FileInfo, errs []error) bool {
if len(raw) == 0 {
// All drives have replied, and fileInfoFromRaw has already validated each raw
// buffer and selected its latest visible version. Reuse that decoded state:
// revalidating the raw history here adds work proportional to version count.
// Any missing response, logical disagreement, or history-property disagreement
// retains the full merge. Legacy objects and delete markers also use that path.
func uniformLatestVersion(meta []FileInfo, errs []error) bool {
if len(meta) == 0 {
return false
}
var first xlMetaV2VersionHeader
var firstVersions int
for i, r := range raw {
if errs[i] != nil || !meta[i].IsValid() || !sameFileInfoVersion(meta[0], meta[i]) {
return false
}
buf, _, err := isIndexedMetaV2(r.Buf)
if err != nil || buf == nil {
return false
}
n, hv, mv, rest, err := decodeXLHeaders(buf)
if err != nil || n < 1 || mv != xlMetaVersion {
return false
}
var h xlMetaV2VersionHeader
err = decodeVersions(rest, 1, func(_ int, hdr, _ []byte) error { _, e := h.unmarshalV(hv, hdr); return e })
if err != nil || h.Type != ObjectType || h.FreeVersion() {
return false
}
if i == 0 {
first = h
firstVersions = n
} else if h != first || n != firstVersions || meta[i].NumVersions != meta[0].NumVersions || !meta[i].SuccessorModTime.Equal(meta[0].SuccessorModTime) {
first := meta[0]
for i, fi := range meta {
if errs[i] != nil || !fi.IsValid() || fi.XLV1 || fi.Deleted || !fi.IsLatest || fi.NumVersions < 1 ||
!fi.ModTime.Equal(first.ModTime) || !sameFileInfoVersion(first, fi) ||
fi.NumVersions != first.NumVersions || !fi.SuccessorModTime.Equal(first.SuccessorModTime) {
return false
}
}