fix: multiple pool reads parallelize when possible (#11537)

cmd/erasure-object.go

@@ -370,12 +370,14 @@ func (er erasureObjects) getObject(ctx context.Context, bucket, object string, s
 
 // GetObjectInfo - reads object metadata and replies back ObjectInfo.
 func (er erasureObjects) GetObjectInfo(ctx context.Context, bucket, object string, opts ObjectOptions) (info ObjectInfo, err error) {
+	if !opts.NoLock {
 		// Lock the object before reading.
 		lk := er.NewNSLock(bucket, object)
 		if err := lk.GetRLock(ctx, globalOperationTimeout); err != nil {
 			return ObjectInfo{}, err
 		}
 		defer lk.RUnlock()
+	}
 
 	return er.getObjectInfo(ctx, bucket, object, opts)
 }

cmd/erasure-server-pool.go

@@ -511,16 +511,71 @@ func (z *erasureServerPools) GetObjectNInfo(ctx context.Context, bucket, object
 
 	object = encodeDirObject(object)
 
-	for _, pool := range z.serverPools {
+	if z.SinglePool() {
-		gr, err = pool.GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
+		return z.serverPools[0].GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
-		if err != nil {
+	}
-			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
+
-				continue
+	var unlockOnDefer bool
+	var nsUnlocker = func() {}
+	defer func() {
+		if unlockOnDefer {
+			nsUnlocker()
+		}
+	}()
+
+	// Acquire lock
+	if lockType != noLock {
+		lock := z.NewNSLock(bucket, object)
+		switch lockType {
+		case writeLock:
+			if err = lock.GetLock(ctx, globalOperationTimeout); err != nil {
+				return nil, err
+			}
+			nsUnlocker = lock.Unlock
+		case readLock:
+			if err = lock.GetRLock(ctx, globalOperationTimeout); err != nil {
+				return nil, err
+			}
+			nsUnlocker = lock.RUnlock
+		}
+		unlockOnDefer = true
+	}
+
+	errs := make([]error, len(z.serverPools))
+	grs := make([]*GetObjectReader, len(z.serverPools))
+
+	lockType = noLock // do not take locks at lower levels
+	var wg sync.WaitGroup
+	for i, pool := range z.serverPools {
+		wg.Add(1)
+		go func(i int, pool *erasureSets) {
+			defer wg.Done()
+			grs[i], errs[i] = pool.GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
+		}(i, pool)
+	}
+	wg.Wait()
+
+	var found int = -1
+	for i, err := range errs {
+		if err == nil {
+			found = i
+			break
+		}
+		if !isErrObjectNotFound(err) && !isErrVersionNotFound(err) {
+			for _, grr := range grs {
+				if grr != nil {
+					grr.Close()
+				}
 			}
 			return gr, err
 		}
-		return gr, nil
 	}
+
+	if found >= 0 {
+		return grs[found], nil
+	}
+
+	object = decodeDirObject(object)
 	if opts.VersionID != "" {
 		return gr, VersionNotFound{Bucket: bucket, Object: object, VersionID: opts.VersionID}
 	}
@@ -533,7 +588,6 @@ func (z *erasureServerPools) GetObject(ctx context.Context, bucket, object strin
 	}
 
 	object = encodeDirObject(object)
-
 	for _, pool := range z.serverPools {
 		if err := pool.GetObject(ctx, bucket, object, startOffset, length, writer, etag, opts); err != nil {
 			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
@@ -555,16 +609,49 @@ func (z *erasureServerPools) GetObjectInfo(ctx context.Context, bucket, object s
 	}
 
 	object = encodeDirObject(object)
-	for _, pool := range z.serverPools {
+
-		objInfo, err = pool.GetObjectInfo(ctx, bucket, object, opts)
+	if z.SinglePool() {
-		if err != nil {
+		return z.serverPools[0].GetObjectInfo(ctx, bucket, object, opts)
-			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
-				continue
 	}
-			return objInfo, err
+
+	// Lock the object before reading.
+	lk := z.NewNSLock(bucket, object)
+	if err := lk.GetRLock(ctx, globalOperationTimeout); err != nil {
+		return ObjectInfo{}, err
 	}
-		return objInfo, nil
+	defer lk.RUnlock()
+
+	errs := make([]error, len(z.serverPools))
+	objInfos := make([]ObjectInfo, len(z.serverPools))
+
+	opts.NoLock = true // avoid taking locks at lower levels for multi-pool setups.
+	var wg sync.WaitGroup
+	for i, pool := range z.serverPools {
+		wg.Add(1)
+		go func(i int, pool *erasureSets) {
+			defer wg.Done()
+			objInfos[i], errs[i] = pool.GetObjectInfo(ctx, bucket, object, opts)
+		}(i, pool)
 	}
+	wg.Wait()
+
+	var found int = -1
+	for i, err := range errs {
+		if err == nil {
+			found = i
+			break
+		}
+		if !isErrObjectNotFound(err) && !isErrVersionNotFound(err) {
+			// some errors such as MethodNotAllowed for delete marker
+			// should be returned upwards.
+			return objInfos[i], err
+		}
+	}
+
+	if found >= 0 {
+		return objInfos[found], nil
+	}
+
 	object = decodeDirObject(object)
 	if opts.VersionID != "" {
 		return objInfo, VersionNotFound{Bucket: bucket, Object: object, VersionID: opts.VersionID}
@@ -600,7 +687,6 @@ func (z *erasureServerPools) DeleteObject(ctx context.Context, bucket string, ob
 	}
 
 	object = encodeDirObject(object)
-
 	if z.SinglePool() {
 		return z.serverPools[0].DeleteObject(ctx, bucket, object, opts)
 	}
@@ -1590,27 +1676,13 @@ func (z *erasureServerPools) PutObjectTags(ctx context.Context, bucket, object s
 		return z.serverPools[0].PutObjectTags(ctx, bucket, object, tags, opts)
 	}
 
-	for _, pool := range z.serverPools {
+	// We don't know the size here set 1GiB atleast.
-		objInfo, err := pool.PutObjectTags(ctx, bucket, object, tags, opts)
+	idx, err := z.getPoolIdx(ctx, bucket, object, 1<<30)
 	if err != nil {
-			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
-				continue
-			}
 		return ObjectInfo{}, err
 	}
-		return objInfo, nil
+
-	}
+	return z.serverPools[idx].PutObjectTags(ctx, bucket, object, tags, opts)
-	if opts.VersionID != "" {
-		return ObjectInfo{}, VersionNotFound{
-			Bucket:    bucket,
-			Object:    object,
-			VersionID: opts.VersionID,
-		}
-	}
-	return ObjectInfo{}, ObjectNotFound{
-		Bucket: bucket,
-		Object: object,
-	}
 }
 
 // DeleteObjectTags - delete object tags from an existing object
@@ -1619,27 +1691,14 @@ func (z *erasureServerPools) DeleteObjectTags(ctx context.Context, bucket, objec
 	if z.SinglePool() {
 		return z.serverPools[0].DeleteObjectTags(ctx, bucket, object, opts)
 	}
-	for _, pool := range z.serverPools {
+
-		objInfo, err := pool.DeleteObjectTags(ctx, bucket, object, opts)
+	// We don't know the size here set 1GiB atleast.
+	idx, err := z.getPoolIdx(ctx, bucket, object, 1<<30)
 	if err != nil {
-			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
-				continue
-			}
 		return ObjectInfo{}, err
 	}
-		return objInfo, nil
+
-	}
+	return z.serverPools[idx].DeleteObjectTags(ctx, bucket, object, opts)
-	if opts.VersionID != "" {
-		return ObjectInfo{}, VersionNotFound{
-			Bucket:    bucket,
-			Object:    object,
-			VersionID: opts.VersionID,
-		}
-	}
-	return ObjectInfo{}, ObjectNotFound{
-		Bucket: bucket,
-		Object: object,
-	}
 }
 
 // GetObjectTags - get object tags from an existing object
@@ -1648,25 +1707,12 @@ func (z *erasureServerPools) GetObjectTags(ctx context.Context, bucket, object s
 	if z.SinglePool() {
 		return z.serverPools[0].GetObjectTags(ctx, bucket, object, opts)
 	}
-	for _, pool := range z.serverPools {
+
-		tags, err := pool.GetObjectTags(ctx, bucket, object, opts)
+	// We don't know the size here set 1GiB atleast.
+	idx, err := z.getPoolIdx(ctx, bucket, object, 1<<30)
 	if err != nil {
-			if isErrObjectNotFound(err) || isErrVersionNotFound(err) {
+		return nil, err
-				continue
-			}
-			return tags, err
-		}
-		return tags, nil
-	}
-	if opts.VersionID != "" {
-		return nil, VersionNotFound{
-			Bucket:    bucket,
-			Object:    object,
-			VersionID: opts.VersionID,
-		}
-	}
-	return nil, ObjectNotFound{
-		Bucket: bucket,
-		Object: object,
 	}
+
+	return z.serverPools[idx].GetObjectTags(ctx, bucket, object, opts)
 }