diff --git a/weed/util/bptree/bpmap.go b/weed/util/bptree/bpmap.go
index 37b2b25bb..43c07d71f 100644
--- a/weed/util/bptree/bpmap.go
+++ b/weed/util/bptree/bpmap.go
@@ -12,28 +12,19 @@ type BpMap BpTree
 func NewBpMap(node_size int) *BpMap {
 	return &BpMap{
 		root: NewLeaf(node_size, true),
-		size: 0,
 	}
 }
 
-func (self *BpMap) Size() int {
-	return (*BpTree)(self).Size()
-}
-
 func (self *BpMap) Has(key Hashable) bool {
 	return (*BpTree)(self).Has(key)
 }
 
 func (self *BpMap) Put(key Hashable, value interface{}) (err error) {
-	had := self.Has(key)
 	new_root, err := self.root.put(key, value)
 	if err != nil {
 		return err
 	}
 	self.root = new_root
-	if !had {
-		self.size += 1
-	}
 	return nil
 }
 
@@ -60,7 +51,6 @@ func (self *BpMap) Remove(key Hashable) (value interface{}, err error) {
 	} else {
 		self.root = new_root
 	}
-	self.size--
 	return value, nil
 }
 
diff --git a/weed/util/bptree/bptree.go b/weed/util/bptree/bptree.go
index 4b68adb20..95f53ab29 100644
--- a/weed/util/bptree/bptree.go
+++ b/weed/util/bptree/bptree.go
@@ -8,7 +8,6 @@ package bptree
  */
 type BpTree struct {
 	root *BpNode
-	size int
 }
 
 type loc_iterator func() (i int, leaf *BpNode, li loc_iterator)
@@ -16,14 +15,9 @@ type loc_iterator func() (i int, leaf *BpNode, li loc_iterator)
 func NewBpTree(node_size int) *BpTree {
 	return &BpTree{
 		root: NewLeaf(node_size, false),
-		size: 0,
 	}
 }
 
-func (self *BpTree) Size() int {
-	return self.size
-}
-
 func (self *BpTree) Has(key Hashable) bool {
 	if len(self.root.keys) == 0 {
 		return false
@@ -52,7 +46,6 @@ func (self *BpTree) Add(key Hashable, value interface{}) (err error) {
 		return err
 	}
 	self.root = new_root
-	self.size += 1
 	return nil
 }
 
@@ -100,7 +93,6 @@ func (self *BpTree) RemoveWhere(key Hashable, where WhereFunc) (err error) {
 	} else {
 		self.root = new_root
 	}
-	self.size -= 1
 	return nil
 }
 
diff --git a/weed/util/bptree/bptree_test.go b/weed/util/bptree/bptree_test.go
index cf978ede7..38663c543 100644
--- a/weed/util/bptree/bptree_test.go
+++ b/weed/util/bptree/bptree_test.go
@@ -110,9 +110,6 @@ func TestAddHasCountFindIterateRemove(t *testing.T) {
 			if err != nil {
 				t.Error(err)
 			}
-			if bpt.Size() != (i + 1) {
-				t.Error("size was wrong", bpt.Size(), i+1)
-			}
 		}
 
 		for i, r := range recs {
@@ -236,9 +233,6 @@ func TestBpMap(t *testing.T) {
 			if err != nil {
 				t.Error(err)
 			}
-			if table.Size() != (i + 1) {
-				t.Error("size was wrong", table.Size(), i+1)
-			}
 		}
 
 		for _, r := range recs {
@@ -274,9 +268,6 @@ func TestBpMap(t *testing.T) {
 					t.Error("wrong value")
 				}
 			}
-			if table.Size() != (len(recs) - (i + 1)) {
-				t.Error("size was wrong", table.Size(), (len(recs) - (i + 1)))
-			}
 		}
 	}
 
diff --git a/weed/util/bptree/types.go b/weed/util/bptree/types.go
index 6a1d83098..45084efdd 100644
--- a/weed/util/bptree/types.go
+++ b/weed/util/bptree/types.go
@@ -32,12 +32,7 @@ type KVIterable interface {
 	Iterate() KVIterator
 }
 
-type Sized interface {
-	Size() int
-}
-
 type MapOperable interface {
-	Sized
 	Has(key Hashable) bool
 	Put(key Hashable, value interface{}) (err error)
 	Get(key Hashable) (value interface{}, err error)