Index: oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeBuilder.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeBuilder.java	(revision 3d2d0931ddeb1f7bf16f01b410f09eb33e5e5c1d)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeBuilder.java	(revision )
@@ -473,8 +473,7 @@
     }
 
     private class ConnectedHead extends Head {
-        protected long revision;
-        protected MutableNodeState state;
+        protected final MutableNodeState state;
 
         public ConnectedHead(MutableNodeState state) {
             this.state = state;
@@ -482,13 +481,6 @@
 
         @Override
         public Head update() {
-            if (revision != rootBuilder.baseRevision) {
-                // the root builder's base state has been reset: re-get
-                // state from parent.
-                MutableNodeState parentState = (MutableNodeState) parent.head().getCurrentNodeState();
-                state = parentState.getMutableChildNode(name);
-                revision = rootBuilder.baseRevision;
-            }
             return this;
         }
 
@@ -522,20 +514,16 @@
     }
 
     private class RootHead extends ConnectedHead {
+        // ensure updating of child builders on first access
+        private long revision = 1;
+
         public RootHead() {
             super(new MutableNodeState(base));
-            // ensure updating of child builders on first access
-            revision = 1;
         }
 
         @Override
-        public Head update() {
-            return this;
-        }
-
-        @Override
         public final void reset() {
-            state = new MutableNodeState(base);
+            state.reset(base);
             revision++;
         }
     }