diff --git a/pregelix/pregelix-runtime/pom.xml b/pregelix/pregelix-runtime/pom.xml
index ae9f47e..54e2256 100644
--- a/pregelix/pregelix-runtime/pom.xml
+++ b/pregelix/pregelix-runtime/pom.xml
@@ -148,6 +148,13 @@
 		</dependency>
 		<dependency>
 			<groupId>edu.uci.ics.hyracks</groupId>
+			<artifactId>hyracks-storage-am-lsm-common</artifactId>
+			<version>0.2.7-SNAPSHOT</version>
+			<type>jar</type>
+			<scope>compile</scope>
+		</dependency>
+		<dependency>
+			<groupId>edu.uci.ics.hyracks</groupId>
 			<artifactId>hyracks-control-cc</artifactId>
 			<version>0.2.7-SNAPSHOT</version>
 			<type>jar</type>
diff --git a/pregelix/pregelix-runtime/src/main/java/edu/uci/ics/pregelix/runtime/bootstrap/VirtualBufferCacheProvider.java b/pregelix/pregelix-runtime/src/main/java/edu/uci/ics/pregelix/runtime/bootstrap/VirtualBufferCacheProvider.java
new file mode 100644
index 0000000..ec51047
--- /dev/null
+++ b/pregelix/pregelix-runtime/src/main/java/edu/uci/ics/pregelix/runtime/bootstrap/VirtualBufferCacheProvider.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.runtime.bootstrap;
+
+import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCacheProvider;
+import edu.uci.ics.pregelix.dataflow.context.RuntimeContext;
+
+/**
+ * The virtual buffer cache provider
+ * 
+ * @author yingyib
+ */
+public class VirtualBufferCacheProvider implements IVirtualBufferCacheProvider {
+
+    private static final long serialVersionUID = 1L;
+
+    public VirtualBufferCacheProvider(){
+        
+    }
+    
+    @Override
+    public synchronized IVirtualBufferCache getVirtualBufferCache(IHyracksTaskContext ctx) {
+        return RuntimeContext.get(ctx).getVirtualBufferCache();
+    }
+}
diff --git a/pregelix/pregelix-runtime/src/main/java/edu/uci/ics/pregelix/runtime/function/NoOpUpdateFunctionFactory.java b/pregelix/pregelix-runtime/src/main/java/edu/uci/ics/pregelix/runtime/function/NoOpUpdateFunctionFactory.java
new file mode 100644
index 0000000..88577c2
--- /dev/null
+++ b/pregelix/pregelix-runtime/src/main/java/edu/uci/ics/pregelix/runtime/function/NoOpUpdateFunctionFactory.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.runtime.function;
+
+import edu.uci.ics.hyracks.api.comm.IFrameWriter;
+import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
+import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
+import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
+import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
+import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference;
+import edu.uci.ics.pregelix.dataflow.std.base.IUpdateFunction;
+import edu.uci.ics.pregelix.dataflow.std.base.IUpdateFunctionFactory;
+
+/**
+ * No operation update function factory
+ * 
+ * @author yingyib
+ */
+public class NoOpUpdateFunctionFactory implements IUpdateFunctionFactory {
+    private static final long serialVersionUID = 1L;
+    public static NoOpUpdateFunctionFactory INSTANCE = new NoOpUpdateFunctionFactory();
+
+    private NoOpUpdateFunctionFactory() {
+
+    }
+
+    @Override
+    public IUpdateFunction createFunction() {
+        return new IUpdateFunction() {
+
+            @Override
+            public void open(IHyracksTaskContext ctx, RecordDescriptor rd, IFrameWriter... writer)
+                    throws HyracksDataException {
+
+            }
+
+            @Override
+            public void process(Object[] tuple) throws HyracksDataException {
+
+            }
+
+            @Override
+            public void close() throws HyracksDataException {
+
+            }
+
+            @Override
+            public void update(ITupleReference tupleRef, ArrayTupleBuilder cloneUpdateTb) throws HyracksDataException {
+
+            }
+
+        };
+    }
+
+}