diff --git a/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/GlobalCountAggregator.java b/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/GlobalCountAggregator.java
new file mode 100644
index 0000000..1c1fa92
--- /dev/null
+++ b/pregelix/pregelix-api/src/main/java/edu/uci/ics/pregelix/api/util/GlobalCountAggregator.java
@@ -0,0 +1,42 @@
+package edu.uci.ics.pregelix.api.util;
+
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.Writable;
+import org.apache.hadoop.io.WritableComparable;
+
+import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
+import edu.uci.ics.pregelix.api.graph.GlobalAggregator;
+import edu.uci.ics.pregelix.api.graph.Vertex;
+
+@SuppressWarnings("rawtypes")
+public class GlobalCountAggregator<I extends WritableComparable, V extends Writable, E extends Writable, M extends Writable>
+        extends GlobalAggregator<I, V, E, M, LongWritable, LongWritable> {
+
+    private LongWritable state = new LongWritable(0);
+
+    @Override
+    public void init() {
+        state.set(0);
+    }
+
+    @Override
+    public void step(Vertex<I, V, E, M> v) throws HyracksDataException {
+        state.set(state.get() + 1);
+    }
+
+    @Override
+    public void step(LongWritable partialResult) {
+        state.set(state.get() + partialResult.get());
+    }
+
+    @Override
+    public LongWritable finishPartial() {
+        return state;
+    }
+
+    @Override
+    public LongWritable finishFinal() {
+        return state;
+    }
+
+}
diff --git a/pregelix/pregelix-dataflow/src/main/java/edu/uci/ics/pregelix/dataflow/FinalAggregateOperatorDescriptor.java b/pregelix/pregelix-dataflow/src/main/java/edu/uci/ics/pregelix/dataflow/FinalAggregateOperatorDescriptor.java
new file mode 100644
index 0000000..eda7754
--- /dev/null
+++ b/pregelix/pregelix-dataflow/src/main/java/edu/uci/ics/pregelix/dataflow/FinalAggregateOperatorDescriptor.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2009-2010 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.dataflow;
+
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.nio.ByteBuffer;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.Writable;
+
+import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
+import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable;
+import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider;
+import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
+import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
+import edu.uci.ics.hyracks.dataflow.common.comm.util.ByteBufferInputStream;
+import edu.uci.ics.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryInputSinkOperatorNodePushable;
+import edu.uci.ics.pregelix.api.graph.GlobalAggregator;
+import edu.uci.ics.pregelix.api.util.BspUtils;
+import edu.uci.ics.pregelix.dataflow.base.IConfigurationFactory;
+import edu.uci.ics.pregelix.dataflow.std.base.IRecordDescriptorFactory;
+import edu.uci.ics.pregelix.dataflow.util.IterationUtils;
+
+public class FinalAggregateOperatorDescriptor extends AbstractSingleActivityOperatorDescriptor {
+    private static final long serialVersionUID = 1L;
+
+    private final IConfigurationFactory confFactory;
+    private final String jobId;
+    private final IRecordDescriptorFactory inputRdFactory;
+
+    public FinalAggregateOperatorDescriptor(JobSpecification spec, IConfigurationFactory confFactory,
+            IRecordDescriptorFactory inputRdFactory, String jobId) {
+        super(spec, 1, 0);
+        this.confFactory = confFactory;
+        this.jobId = jobId;
+        this.inputRdFactory = inputRdFactory;
+    }
+
+    @Override
+    public IOperatorNodePushable createPushRuntime(final IHyracksTaskContext ctx,
+            IRecordDescriptorProvider recordDescProvider, int partition, int nPartitions) throws HyracksDataException {
+        return new AbstractUnaryInputSinkOperatorNodePushable() {
+            private Configuration conf = confFactory.createConfiguration();
+            @SuppressWarnings("rawtypes")
+            private GlobalAggregator aggregator = BspUtils.createGlobalAggregator(conf);
+            private FrameTupleAccessor accessor = new FrameTupleAccessor(ctx.getFrameSize(),
+                    inputRdFactory.createRecordDescriptor());
+            private ByteBufferInputStream inputStream = new ByteBufferInputStream();
+            private DataInput input = new DataInputStream(inputStream);
+            private Writable partialAggregateValue = BspUtils.createFinalAggregateValue(conf);
+
+            @Override
+            public void open() throws HyracksDataException {
+                aggregator.init();
+            }
+
+            @SuppressWarnings("unchecked")
+            @Override
+            public void nextFrame(ByteBuffer buffer) throws HyracksDataException {
+                accessor.reset(buffer);
+                int tupleCount = accessor.getTupleCount();
+                try {
+                    for (int i = 0; i < tupleCount; i++) {
+                        int start = accessor.getFieldSlotsLength() + accessor.getTupleStartOffset(i)
+                                + accessor.getFieldStartOffset(i, 0);
+                        inputStream.setByteBuffer(buffer, start);
+                        partialAggregateValue.readFields(input);
+                        aggregator.step(partialAggregateValue);
+                    }
+                } catch (Exception e) {
+                    throw new HyracksDataException(e);
+                }
+            }
+
+            @Override
+            public void fail() throws HyracksDataException {
+
+            }
+
+            @Override
+            public void close() throws HyracksDataException {
+                Writable finalAggregateValue = aggregator.finishFinal();
+                IterationUtils.writeGlobalAggregateValue(conf, jobId, finalAggregateValue);
+            }
+
+        };
+    }
+}