From 354a92ea2c5aeaeaae0705219ee39c2b1efc1f06 Mon Sep 17 00:00:00 2001
From: Dmitrii Stepanov <d.stepanov@yadro.com>
Date: Fri, 18 Aug 2023 09:08:26 +0300
Subject: [PATCH] [#602] blobovnicza: Add leaf width implementation

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
---
 cmd/frostfs-node/config.go                       |  1 +
 .../blobstor/blobovniczatree/blobovnicza.go      | 16 ++++++++++++----
 .../blobstor/blobovniczatree/iterate.go          |  7 ++++++-
 .../blobstor/blobovniczatree/option.go           |  7 +++++++
 4 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/cmd/frostfs-node/config.go b/cmd/frostfs-node/config.go
index 45ddeec83..808a78d28 100644
--- a/cmd/frostfs-node/config.go
+++ b/cmd/frostfs-node/config.go
@@ -776,6 +776,7 @@ func (c *cfg) getSubstorageOpts(shCfg shardCfg) []blobstor.SubStorage {
 				blobovniczatree.WithBlobovniczaSize(sRead.size),
 				blobovniczatree.WithBlobovniczaShallowDepth(sRead.depth),
 				blobovniczatree.WithBlobovniczaShallowWidth(sRead.width),
+				blobovniczatree.WithBlobovniczaLeafWidth(sRead.leafWidth),
 				blobovniczatree.WithOpenedCacheSize(sRead.openedCacheSize),
 				blobovniczatree.WithLogger(c.log),
 			}
diff --git a/pkg/local_object_storage/blobstor/blobovniczatree/blobovnicza.go b/pkg/local_object_storage/blobstor/blobovniczatree/blobovnicza.go
index d4fedb14c..80d064c80 100644
--- a/pkg/local_object_storage/blobstor/blobovniczatree/blobovnicza.go
+++ b/pkg/local_object_storage/blobstor/blobovniczatree/blobovnicza.go
@@ -98,6 +98,10 @@ func NewBlobovniczaTree(opts ...Option) (blz *Blobovniczas) {
 		opts[i](&blz.cfg)
 	}
 
+	if blz.blzLeafWidth == 0 {
+		blz.blzLeafWidth = blz.blzShallowWidth
+	}
+
 	cache, err := simplelru.NewLRU[string, *blobovnicza.Blobovnicza](blz.openedCacheSize, func(p string, value *blobovnicza.Blobovnicza) {
 		lvlPath := filepath.Dir(p)
 		if b, ok := blz.active[lvlPath]; ok && b.ind == u64FromHexString(filepath.Base(p)) {
@@ -120,13 +124,17 @@ func NewBlobovniczaTree(opts ...Option) (blz *Blobovniczas) {
 		panic(fmt.Errorf("could not create LRU cache of size %d: %w", blz.openedCacheSize, err))
 	}
 
-	cp := uint64(1)
+	activeMapCapacity := uint64(1)
 	for i := uint64(0); i < blz.blzShallowDepth; i++ {
-		cp *= blz.blzShallowWidth
+		if i+1 == blz.blzShallowDepth {
+			activeMapCapacity *= blz.blzLeafWidth
+		} else {
+			activeMapCapacity *= blz.blzShallowWidth
+		}
 	}
 
 	blz.opened = cache
-	blz.active = make(map[string]blobovniczaWithIndex, cp)
+	blz.active = make(map[string]blobovniczaWithIndex, activeMapCapacity)
 
 	return blz
 }
@@ -161,7 +169,7 @@ func (b *Blobovniczas) updateAndGet(lvlPath string, old *uint64) (blobovniczaWit
 
 	if ok {
 		if old != nil {
-			if active.ind == b.blzShallowWidth-1 {
+			if active.ind == b.blzLeafWidth-1 {
 				return active, logicerr.New("no more Blobovniczas")
 			} else if active.ind != *old {
 				// sort of CAS in order to control concurrent
diff --git a/pkg/local_object_storage/blobstor/blobovniczatree/iterate.go b/pkg/local_object_storage/blobstor/blobovniczatree/iterate.go
index 0154fe2ca..aeac854f7 100644
--- a/pkg/local_object_storage/blobstor/blobovniczatree/iterate.go
+++ b/pkg/local_object_storage/blobstor/blobovniczatree/iterate.go
@@ -115,7 +115,12 @@ func (b *Blobovniczas) iterateDeepest(ctx context.Context, addr oid.Address, f f
 
 // iterator over particular level of directories.
 func (b *Blobovniczas) iterateSorted(ctx context.Context, addr *oid.Address, curPath []string, execDepth uint64, f func([]string) (bool, error)) (bool, error) {
-	indices := indexSlice(b.blzShallowWidth)
+	isLeafLevel := uint64(len(curPath)) == b.blzShallowDepth
+	levelWidth := b.blzShallowWidth
+	if isLeafLevel {
+		levelWidth = b.blzLeafWidth
+	}
+	indices := indexSlice(levelWidth)
 
 	hrw.SortSliceByValue(indices, addressHash(addr, filepath.Join(curPath...)))
 
diff --git a/pkg/local_object_storage/blobstor/blobovniczatree/option.go b/pkg/local_object_storage/blobstor/blobovniczatree/option.go
index d0503f23b..d11185652 100644
--- a/pkg/local_object_storage/blobstor/blobovniczatree/option.go
+++ b/pkg/local_object_storage/blobstor/blobovniczatree/option.go
@@ -17,6 +17,7 @@ type cfg struct {
 	openedCacheSize int
 	blzShallowDepth uint64
 	blzShallowWidth uint64
+	blzLeafWidth    uint64
 	compression     *compression.Config
 	blzOpts         []blobovnicza.Option
 	// reportError is the function called when encountering disk errors.
@@ -64,6 +65,12 @@ func WithBlobovniczaShallowWidth(width uint64) Option {
 	}
 }
 
+func WithBlobovniczaLeafWidth(w uint64) Option {
+	return func(c *cfg) {
+		c.blzLeafWidth = w
+	}
+}
+
 func WithBlobovniczaShallowDepth(depth uint64) Option {
 	return func(c *cfg) {
 		c.blzShallowDepth = depth