fix: find current location of object multi-zones (#9840)

PutObject on multiple-zone with versioning would not
overwrite the correct location of the object if the
object has delete marker, leading to duplicate objects
on two zones.

This PR fixes by adding affinity towards delete marker
when GetObjectInfo() returns error, use the zone index
which has the delete marker.

.github/workflows/go.yml

@@ -4,9 +4,7 @@ on:
   pull_request:
     branches:
     - master
-  push:
+    - release
-    branches:
-    - master
 
 jobs:
   build:

cmd/erasure-object.go

@@ -401,11 +401,12 @@ func (er erasureObjects) getObjectInfo(ctx context.Context, bucket, object strin
 	}
 
 	if fi.Deleted {
+		objInfo = fi.ToObjectInfo(bucket, object)
 		if opts.VersionID == "" {
 			return objInfo, toObjectErr(errFileNotFound, bucket, object)
 		}
 		// Make sure to return object info to provide extra information.
-		return fi.ToObjectInfo(bucket, object), toObjectErr(errMethodNotAllowed, bucket, object)
+		return objInfo, toObjectErr(errMethodNotAllowed, bucket, object)
 	}
 
 	return fi.ToObjectInfo(bucket, object), nil

cmd/erasure-zones.go

@@ -151,6 +151,36 @@ func (z *erasureZones) getZonesAvailableSpace(ctx context.Context) zonesAvailabl
 	return zones
 }
 
+// getZoneIdx returns the found previous object and its corresponding zone idx,
+// if none are found falls back to most available space zone.
+func (z *erasureZones) getZoneIdx(ctx context.Context, bucket, object string, opts ObjectOptions) (idx int, err error) {
+	if z.SingleZone() {
+		return 0, nil
+	}
+	for i, zone := range z.zones {
+		objInfo, err := zone.GetObjectInfo(ctx, bucket, object, opts)
+		switch err.(type) {
+		case ObjectNotFound:
+			// VersionId was not specified but found delete marker or no versions exist.
+		case MethodNotAllowed:
+			// VersionId was specified but found delete marker
+		default:
+			if err != nil {
+				// any other un-handled errors return right here.
+				return -1, err
+			}
+		}
+		// delete marker not specified means no versions
+		// exist continue to next zone.
+		if !objInfo.DeleteMarker && err != nil {
+			continue
+		}
+		// Success case and when DeleteMarker is true return.
+		return i, nil
+	}
+	return z.getAvailableZoneIdx(ctx), nil
+}
+
 func (z *erasureZones) Shutdown(ctx context.Context) error {
 	if z.SingleZone() {
 		return z.zones[0].Shutdown(ctx)
@@ -477,19 +507,13 @@ func (z *erasureZones) PutObject(ctx context.Context, bucket string, object stri
 		return z.zones[0].PutObject(ctx, bucket, object, data, opts)
 	}
 
-	for _, zone := range z.zones {
+	idx, err := z.getZoneIdx(ctx, bucket, object, opts)
-		objInfo, err := zone.GetObjectInfo(ctx, bucket, object, opts)
 	if err != nil {
-			if isErrObjectNotFound(err) {
+		return ObjectInfo{}, err
-				continue
-			}
-			return objInfo, err
-		}
-		// Overwrite request upload to right zone.
-		return zone.PutObject(ctx, bucket, object, data, opts)
 	}
-	// Object not found pick the least used and upload to this zone.
+
-	return z.zones[z.getAvailableZoneIdx(ctx)].PutObject(ctx, bucket, object, data, opts)
+	// Overwrite the object at the right zone
+	return z.zones[idx].PutObject(ctx, bucket, object, data, opts)
 }
 
 func (z *erasureZones) DeleteObject(ctx context.Context, bucket string, object string, opts ObjectOptions) (objInfo ObjectInfo, err error) {
@@ -565,27 +589,17 @@ func (z *erasureZones) CopyObject(ctx context.Context, srcBucket, srcObject, dst
 		return z.zones[0].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
 	}
 
-	zoneIndex := -1
+	zoneIdx, err := z.getZoneIdx(ctx, dstBucket, dstObject, dstOpts)
-	for i, zone := range z.zones {
-		objInfo, err := zone.GetObjectInfo(ctx, dstBucket, dstObject, srcOpts)
 	if err != nil {
-			if isErrObjectNotFound(err) {
-				continue
-			}
 		return objInfo, err
 	}
-		zoneIndex = i
-		break
-	}
 
 	putOpts := ObjectOptions{ServerSideEncryption: dstOpts.ServerSideEncryption, UserDefined: srcInfo.UserDefined}
-	if zoneIndex >= 0 {
 	if cpSrcDstSame && srcInfo.metadataOnly {
-			return z.zones[zoneIndex].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
+		return z.zones[zoneIdx].CopyObject(ctx, srcBucket, srcObject, dstBucket, dstObject, srcInfo, srcOpts, dstOpts)
-		}
-		return z.zones[zoneIndex].PutObject(ctx, dstBucket, dstObject, srcInfo.PutObjReader, putOpts)
 	}
-	return z.zones[z.getAvailableZoneIdx(ctx)].PutObject(ctx, dstBucket, dstObject, srcInfo.PutObjReader, putOpts)
+
+	return z.zones[zoneIdx].PutObject(ctx, dstBucket, dstObject, srcInfo.PutObjReader, putOpts)
 }
 
 func (z *erasureZones) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (ListObjectsV2Info, error) {
@@ -1283,7 +1297,13 @@ func (z *erasureZones) NewMultipartUpload(ctx context.Context, bucket, object st
 	if z.SingleZone() {
 		return z.zones[0].NewMultipartUpload(ctx, bucket, object, opts)
 	}
-	return z.zones[z.getAvailableZoneIdx(ctx)].NewMultipartUpload(ctx, bucket, object, opts)
+
+	idx, err := z.getZoneIdx(ctx, bucket, object, opts)
+	if err != nil {
+		return "", err
+	}
+
+	return z.zones[idx].NewMultipartUpload(ctx, bucket, object, opts)
 }
 
 // Copies a part of an object from source hashedSet to destination hashedSet.