Index: oak-core/src/main/java/org/apache/jackrabbit/oak/kernel/KernelNodeStore.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/kernel/KernelNodeStore.java	(revision 1625245)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/kernel/KernelNodeStore.java	(working copy)
@@ -228,8 +228,9 @@
     }
 
     @Override
-    public void release(String checkpoint) {
+    public boolean release(String checkpoint) {
         // TODO
+        return true;
     }
 
     public CacheStats getCacheStats() {
Index: oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/document/DocumentNodeStore.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/document/DocumentNodeStore.java	(revision 1625245)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/document/DocumentNodeStore.java	(working copy)
@@ -1344,8 +1344,9 @@
     }
 
     @Override
-    public void release(@Nonnull String checkpoint) {
+    public boolean release(@Nonnull String checkpoint) {
         checkpoints.release(checkpoint);
+        return true;
     }
 
     //------------------------< RevisionContext >-------------------------------
Index: oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeStore.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeStore.java	(revision 1625245)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeStore.java	(working copy)
@@ -201,8 +201,9 @@
     }
 
     @Override
-    public synchronized void release(String checkpoint) {
+    public synchronized boolean release(String checkpoint) {
         checkpoints.remove(checkpoint);
+        return true;
     }
 
     /** test purpose only! */
Index: oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/SegmentNodeStore.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/SegmentNodeStore.java	(revision 1625245)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/SegmentNodeStore.java	(working copy)
@@ -273,7 +273,7 @@
     }
 
     @Override
-    public void release(@Nonnull String checkpoint) {
+    public boolean release(@Nonnull String checkpoint) {
         checkNotNull(checkpoint);
 
         // try 5 times
@@ -289,18 +289,18 @@
                             checkpoint);
                     if (cp.exists()) {
                         cp.remove();
-                    }
-                    SegmentNodeState newState = builder.getNodeState();
-                    if (store.setHead(state, newState)) {
-                        refreshHead();
-                        return;
+                        SegmentNodeState newState = builder.getNodeState();
+                        if (store.setHead(state, newState)) {
+                            refreshHead();
+                            return true;
+                        }
                     }
-
                 } finally {
                     commitSemaphore.release();
                 }
             }
         }
+        return false;
     }
 
     private class Commit {
Index: oak-core/src/main/java/org/apache/jackrabbit/oak/spi/state/NodeStore.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/spi/state/NodeStore.java	(revision 1625245)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/spi/state/NodeStore.java	(working copy)
@@ -134,6 +134,6 @@
     @CheckForNull
     NodeState retrieve(@Nonnull String checkpoint);
 
-    void release(@Nonnull String checkpoint);
+    boolean release(@Nonnull String checkpoint);
 
 }
Index: oak-core/src/main/java/org/apache/jackrabbit/oak/spi/state/ProxyNodeStore.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/spi/state/ProxyNodeStore.java	(revision 1625245)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/spi/state/ProxyNodeStore.java	(working copy)
@@ -73,8 +73,8 @@
     }
 
     @Override
-    public void release(String checkpoint) {
-        getNodeStore().release(checkpoint);
+    public boolean release(String checkpoint) {
+        return getNodeStore().release(checkpoint);
     }
 
 }