diff --git a/hyracks/hyracks-examples/text-example/textclient/pom.xml b/hyracks/hyracks-examples/text-example/textclient/pom.xml
index 3bf69e2..a88c421 100644
--- a/hyracks/hyracks-examples/text-example/textclient/pom.xml
+++ b/hyracks/hyracks-examples/text-example/textclient/pom.xml
@@ -67,24 +67,7 @@
               <goal>assemble</goal>
             </goals>
           </execution>
-          <execution>
-          	<id>groupclient</id>
-            <configuration>
-              <programs>
-                <program>
-                  <mainClass>org.apache.hyracks.examples.text.client.ExternalGroupClient</mainClass>
-                  <name>groupclient</name>
-                </program>
-              </programs>
-              <repositoryLayout>flat</repositoryLayout>
-              <repositoryName>lib</repositoryName>
-            </configuration>
-            <phase>package</phase>
-            <goals>
-              <goal>assemble</goal>
-            </goals>
-          </execution>
-        </executions>
+       </executions>
       </plugin>
       <plugin>
         <artifactId>maven-assembly-plugin</artifactId>
diff --git a/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/ExternalGroupClient.java b/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/ExternalGroupClient.java
deleted file mode 100644
index 1ae3258..0000000
--- a/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/ExternalGroupClient.java
+++ /dev/null
@@ -1,325 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you 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 at
- *
- *   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 org.apache.hyracks.examples.text.client;
-
-import java.io.File;
-
-import org.kohsuke.args4j.CmdLineParser;
-import org.kohsuke.args4j.Option;
-
-import org.apache.hyracks.api.client.HyracksConnection;
-import org.apache.hyracks.api.client.IHyracksClientConnection;
-import org.apache.hyracks.api.constraints.PartitionConstraintHelper;
-import org.apache.hyracks.api.dataflow.IConnectorDescriptor;
-import org.apache.hyracks.api.dataflow.IOperatorDescriptor;
-import org.apache.hyracks.api.dataflow.value.IBinaryComparatorFactory;
-import org.apache.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
-import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
-import org.apache.hyracks.api.dataflow.value.RecordDescriptor;
-import org.apache.hyracks.api.io.FileReference;
-import org.apache.hyracks.api.job.JobId;
-import org.apache.hyracks.api.job.JobSpecification;
-import org.apache.hyracks.data.std.accessors.PointableBinaryComparatorFactory;
-import org.apache.hyracks.data.std.accessors.PointableBinaryHashFunctionFactory;
-import org.apache.hyracks.data.std.primitive.IntegerPointable;
-import org.apache.hyracks.dataflow.common.data.marshalling.FloatSerializerDeserializer;
-import org.apache.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
-import org.apache.hyracks.dataflow.common.data.marshalling.UTF8StringSerializerDeserializer;
-import org.apache.hyracks.dataflow.common.data.normalizers.IntegerNormalizedKeyComputerFactory;
-import org.apache.hyracks.dataflow.common.data.parsers.FloatParserFactory;
-import org.apache.hyracks.dataflow.common.data.parsers.IValueParserFactory;
-import org.apache.hyracks.dataflow.common.data.parsers.IntegerParserFactory;
-import org.apache.hyracks.dataflow.common.data.parsers.UTF8StringParserFactory;
-import org.apache.hyracks.dataflow.common.data.partition.FieldHashPartitionComputerFactory;
-import org.apache.hyracks.dataflow.std.base.AbstractOperatorDescriptor;
-import org.apache.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor;
-import org.apache.hyracks.dataflow.std.connectors.MToNPartitioningConnectorDescriptor;
-import org.apache.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
-import org.apache.hyracks.dataflow.std.file.ConstantFileSplitProvider;
-import org.apache.hyracks.dataflow.std.file.DelimitedDataTupleParserFactory;
-import org.apache.hyracks.dataflow.std.file.FileScanOperatorDescriptor;
-import org.apache.hyracks.dataflow.std.file.FileSplit;
-import org.apache.hyracks.dataflow.std.file.FrameFileWriterOperatorDescriptor;
-import org.apache.hyracks.dataflow.std.file.IFileSplitProvider;
-import org.apache.hyracks.dataflow.std.file.PlainFileWriterOperatorDescriptor;
-import org.apache.hyracks.dataflow.std.group.HashSpillableTableFactory;
-import org.apache.hyracks.dataflow.std.group.IFieldAggregateDescriptorFactory;
-import org.apache.hyracks.dataflow.std.group.aggregators.CountFieldAggregatorFactory;
-import org.apache.hyracks.dataflow.std.group.aggregators.IntSumFieldAggregatorFactory;
-import org.apache.hyracks.dataflow.std.group.aggregators.MultiFieldsAggregatorFactory;
-import org.apache.hyracks.dataflow.std.group.hash.HashGroupOperatorDescriptor;
-import org.apache.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
-
-/**
- * The application client for the performance tests of the external hash group
- * operator.
- */
-public class ExternalGroupClient {
-    private static class Options {
-        @Option(name = "-host", usage = "Hyracks Cluster Controller Host name", required = true)
-        public String host;
-
-        @Option(name = "-port", usage = "Hyracks Cluster Controller Port (default: 1098)")
-        public int port = 1098;
-
-        @Option(name = "-infile-splits", usage = "Comma separated list of file-splits for the input. A file-split is <node-name>:<path>", required = true)
-        public String inFileSplits;
-
-        @Option(name = "-outfile-splits", usage = "Comma separated list of file-splits for the output", required = true)
-        public String outFileSplits;
-
-        @Option(name = "-hashtable-size", usage = "Hash table size (default: 8191)", required = false)
-        public int htSize = 8191;
-
-        @Option(name = "-frame-size", usage = "Frame size (default: 32768)", required = false)
-        public int frameSize = 32768;
-
-        @Option(name = "-sortbuffer-size", usage = "Sort buffer size in frames (default: 512)", required = false)
-        public int sbSize = 512;
-
-        @Option(name = "-sort-output", usage = "Whether to sort the output (default: true)", required = false)
-        public boolean sortOutput = false;
-
-        @Option(name = "-out-plain", usage = "Whether to output plain text (default: true)", required = false)
-        public boolean outPlain = true;
-
-        @Option(name = "-algo", usage = "The algorithm to be used", required = true)
-        public int algo;
-    }
-
-    /**
-     * @param args
-     */
-    public static void main(String[] args) throws Exception {
-        Options options = new Options();
-        CmdLineParser parser = new CmdLineParser(options);
-        parser.parseArgument(args);
-
-        IHyracksClientConnection hcc = new HyracksConnection(options.host, options.port);
-
-        JobSpecification job;
-
-        for (int i = 0; i < 6; i++) {
-            long start = System.currentTimeMillis();
-            job = createJob(parseFileSplits(options.inFileSplits), parseFileSplits(options.outFileSplits, i),
-                    options.htSize, options.sbSize, options.frameSize, options.sortOutput, options.algo,
-                    options.outPlain);
-
-            System.out.print(i + "\t" + (System.currentTimeMillis() - start));
-            start = System.currentTimeMillis();
-            JobId jobId = hcc.startJob(job);
-            hcc.waitForCompletion(jobId);
-            System.out.println("\t" + (System.currentTimeMillis() - start));
-        }
-    }
-
-    private static FileSplit[] parseFileSplits(String fileSplits) {
-        String[] splits = fileSplits.split(",");
-        FileSplit[] fSplits = new FileSplit[splits.length];
-        for (int i = 0; i < splits.length; ++i) {
-            String s = splits[i].trim();
-            int idx = s.indexOf(':');
-            if (idx < 0) {
-                throw new IllegalArgumentException("File split " + s + " not well formed");
-            }
-            fSplits[i] = new FileSplit(s.substring(0, idx), new FileReference(new File(s.substring(idx + 1))));
-        }
-        return fSplits;
-    }
-
-    private static FileSplit[] parseFileSplits(String fileSplits, int count) {
-        String[] splits = fileSplits.split(",");
-        FileSplit[] fSplits = new FileSplit[splits.length];
-        for (int i = 0; i < splits.length; ++i) {
-            String s = splits[i].trim();
-            int idx = s.indexOf(':');
-            if (idx < 0) {
-                throw new IllegalArgumentException("File split " + s + " not well formed");
-            }
-            fSplits[i] = new FileSplit(s.substring(0, idx), new FileReference(new File(s.substring(idx + 1) + "_"
-                    + count)));
-        }
-        return fSplits;
-    }
-
-    private static JobSpecification createJob(FileSplit[] inSplits, FileSplit[] outSplits, int htSize, int sbSize,
-            int frameSize, boolean sortOutput, int alg, boolean outPlain) {
-        JobSpecification spec = new JobSpecification(frameSize);
-        IFileSplitProvider splitsProvider = new ConstantFileSplitProvider(inSplits);
-
-        RecordDescriptor inDesc = new RecordDescriptor(new ISerializerDeserializer[] {
-                IntegerSerializerDeserializer.INSTANCE, IntegerSerializerDeserializer.INSTANCE,
-                IntegerSerializerDeserializer.INSTANCE, IntegerSerializerDeserializer.INSTANCE,
-                IntegerSerializerDeserializer.INSTANCE, FloatSerializerDeserializer.INSTANCE,
-                FloatSerializerDeserializer.INSTANCE, FloatSerializerDeserializer.INSTANCE,
-                new UTF8StringSerializerDeserializer(), new UTF8StringSerializerDeserializer(),
-                new UTF8StringSerializerDeserializer(), new UTF8StringSerializerDeserializer(),
-                new UTF8StringSerializerDeserializer(), new UTF8StringSerializerDeserializer(),
-                new UTF8StringSerializerDeserializer(), new UTF8StringSerializerDeserializer() });
-
-        FileScanOperatorDescriptor fileScanner = new FileScanOperatorDescriptor(spec, splitsProvider,
-                new DelimitedDataTupleParserFactory(new IValueParserFactory[] { IntegerParserFactory.INSTANCE,
-                        IntegerParserFactory.INSTANCE, IntegerParserFactory.INSTANCE, IntegerParserFactory.INSTANCE,
-                        IntegerParserFactory.INSTANCE, FloatParserFactory.INSTANCE, FloatParserFactory.INSTANCE,
-                        FloatParserFactory.INSTANCE, UTF8StringParserFactory.INSTANCE,
-                        UTF8StringParserFactory.INSTANCE, UTF8StringParserFactory.INSTANCE,
-                        UTF8StringParserFactory.INSTANCE, UTF8StringParserFactory.INSTANCE,
-                        UTF8StringParserFactory.INSTANCE, UTF8StringParserFactory.INSTANCE,
-                        UTF8StringParserFactory.INSTANCE, }, '|'), inDesc);
-
-        createPartitionConstraint(spec, fileScanner, inSplits);
-
-        // Output: each unique string with an integer count
-        RecordDescriptor outDesc = new RecordDescriptor(new ISerializerDeserializer[] {
-                IntegerSerializerDeserializer.INSTANCE,
-                // IntegerSerializerDeserializer.INSTANCE,
-                IntegerSerializerDeserializer.INSTANCE });
-
-        // Specify the grouping key, which will be the string extracted during
-        // the scan.
-        int[] keys = new int[] { 0,
-        // 1
-        };
-
-        AbstractOperatorDescriptor grouper;
-
-        switch (alg) {
-            case 0: // new external hash graph
-                grouper = new org.apache.hyracks.dataflow.std.group.external.ExternalGroupOperatorDescriptor(spec,
-                        keys, frameSize, new IBinaryComparatorFactory[] {
-                        // PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY) },
-                        new IntegerNormalizedKeyComputerFactory(), new MultiFieldsAggregatorFactory(
-                                new IFieldAggregateDescriptorFactory[] { new CountFieldAggregatorFactory(false) }),
-                        new MultiFieldsAggregatorFactory(
-                                new IFieldAggregateDescriptorFactory[] { new IntSumFieldAggregatorFactory(keys.length,
-                                        false) }), outDesc, new HashSpillableTableFactory(
-                                new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
-                                // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                                PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }), htSize), false);
-
-                createPartitionConstraint(spec, grouper, outSplits);
-
-                // Connect scanner with the grouper
-                IConnectorDescriptor scanGroupConnDef2 = new MToNPartitioningConnectorDescriptor(spec,
-                        new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
-                        // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }));
-                spec.connect(scanGroupConnDef2, fileScanner, 0, grouper, 0);
-
-                break;
-            case 1: // External-sort + new-precluster
-                ExternalSortOperatorDescriptor sorter2 = new ExternalSortOperatorDescriptor(spec, frameSize, keys,
-                        new IBinaryComparatorFactory[] {
-                        // PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY) }, inDesc);
-                createPartitionConstraint(spec, sorter2, inSplits);
-
-                // Connect scan operator with the sorter
-                IConnectorDescriptor scanSortConn2 = new MToNPartitioningConnectorDescriptor(spec,
-                        new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
-                        // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }));
-                spec.connect(scanSortConn2, fileScanner, 0, sorter2, 0);
-
-                grouper = new org.apache.hyracks.dataflow.std.group.preclustered.PreclusteredGroupOperatorDescriptor(
-                        spec, keys, new IBinaryComparatorFactory[] {
-                        // PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY) },
-                        new MultiFieldsAggregatorFactory(
-                                new IFieldAggregateDescriptorFactory[] { new CountFieldAggregatorFactory(true) }),
-                        outDesc);
-
-                createPartitionConstraint(spec, grouper, outSplits);
-
-                // Connect sorter with the pre-cluster
-                OneToOneConnectorDescriptor sortGroupConn2 = new OneToOneConnectorDescriptor(spec);
-                spec.connect(sortGroupConn2, sorter2, 0, grouper, 0);
-                break;
-            case 2: // Inmem
-                grouper = new HashGroupOperatorDescriptor(spec, keys, new FieldHashPartitionComputerFactory(keys,
-                        new IBinaryHashFunctionFactory[] {
-                        // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }),
-                        new IBinaryComparatorFactory[] {
-                        // PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY) },
-                        new MultiFieldsAggregatorFactory(
-                                new IFieldAggregateDescriptorFactory[] { new CountFieldAggregatorFactory(true) }),
-                        outDesc, htSize);
-
-                createPartitionConstraint(spec, grouper, outSplits);
-
-                // Connect scanner with the grouper
-                IConnectorDescriptor scanConn2 = new MToNPartitioningConnectorDescriptor(spec,
-                        new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
-                        // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }));
-                spec.connect(scanConn2, fileScanner, 0, grouper, 0);
-                break;
-            default:
-                grouper = new org.apache.hyracks.dataflow.std.group.external.ExternalGroupOperatorDescriptor(spec,
-                        keys, frameSize, new IBinaryComparatorFactory[] {
-                        // PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY) },
-                        new IntegerNormalizedKeyComputerFactory(), new MultiFieldsAggregatorFactory(
-                                new IFieldAggregateDescriptorFactory[] { new CountFieldAggregatorFactory(false) }),
-                        new MultiFieldsAggregatorFactory(
-                                new IFieldAggregateDescriptorFactory[] { new IntSumFieldAggregatorFactory(keys.length,
-                                        false) }), outDesc, new HashSpillableTableFactory(
-                                new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
-                                // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                                PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }), htSize), false);
-
-                createPartitionConstraint(spec, grouper, outSplits);
-
-                // Connect scanner with the grouper
-                IConnectorDescriptor scanGroupConnDef = new MToNPartitioningConnectorDescriptor(spec,
-                        new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
-                        // PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY),
-                        PointableBinaryHashFunctionFactory.of(IntegerPointable.FACTORY) }));
-                spec.connect(scanGroupConnDef, fileScanner, 0, grouper, 0);
-        }
-
-        IFileSplitProvider outSplitProvider = new ConstantFileSplitProvider(outSplits);
-
-        AbstractSingleActivityOperatorDescriptor writer;
-
-        if (outPlain)
-            writer = new PlainFileWriterOperatorDescriptor(spec, outSplitProvider, "|");
-        else
-            writer = new FrameFileWriterOperatorDescriptor(spec, outSplitProvider);
-
-        createPartitionConstraint(spec, writer, outSplits);
-
-        IConnectorDescriptor groupOutConn = new OneToOneConnectorDescriptor(spec);
-        spec.connect(groupOutConn, grouper, 0, writer, 0);
-
-        spec.addRoot(writer);
-        return spec;
-    }
-
-    private static void createPartitionConstraint(JobSpecification spec, IOperatorDescriptor op, FileSplit[] splits) {
-        String[] parts = new String[splits.length];
-        for (int i = 0; i < splits.length; ++i) {
-            parts[i] = splits[i].getNodeName();
-        }
-        PartitionConstraintHelper.addAbsoluteLocationConstraint(spec, op, parts);
-    }
-}
diff --git a/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/WordCountMain.java b/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/WordCountMain.java
index b9cbb9d..22a571f 100644
--- a/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/WordCountMain.java
+++ b/hyracks/hyracks-examples/text-example/textclient/src/main/java/org/apache/hyracks/examples/text/client/WordCountMain.java
@@ -21,9 +21,6 @@
 import java.io.File;
 import java.util.EnumSet;
 
-import org.kohsuke.args4j.CmdLineParser;
-import org.kohsuke.args4j.Option;
-
 import org.apache.hyracks.api.client.HyracksConnection;
 import org.apache.hyracks.api.client.IHyracksClientConnection;
 import org.apache.hyracks.api.constraints.PartitionConstraintHelper;
@@ -31,6 +28,7 @@
 import org.apache.hyracks.api.dataflow.IOperatorDescriptor;
 import org.apache.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import org.apache.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
+import org.apache.hyracks.api.dataflow.value.IBinaryHashFunctionFamily;
 import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
 import org.apache.hyracks.api.dataflow.value.RecordDescriptor;
 import org.apache.hyracks.api.io.FileReference;
@@ -39,6 +37,7 @@
 import org.apache.hyracks.api.job.JobSpecification;
 import org.apache.hyracks.data.std.accessors.PointableBinaryComparatorFactory;
 import org.apache.hyracks.data.std.accessors.PointableBinaryHashFunctionFactory;
+import org.apache.hyracks.data.std.accessors.UTF8StringBinaryHashFunctionFamily;
 import org.apache.hyracks.data.std.primitive.UTF8StringPointable;
 import org.apache.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
 import org.apache.hyracks.dataflow.common.data.marshalling.UTF8StringSerializerDeserializer;
@@ -52,14 +51,19 @@
 import org.apache.hyracks.dataflow.std.file.FrameFileWriterOperatorDescriptor;
 import org.apache.hyracks.dataflow.std.file.IFileSplitProvider;
 import org.apache.hyracks.dataflow.std.file.PlainFileWriterOperatorDescriptor;
+import org.apache.hyracks.dataflow.std.group.HashSpillableTableFactory;
 import org.apache.hyracks.dataflow.std.group.IFieldAggregateDescriptorFactory;
 import org.apache.hyracks.dataflow.std.group.aggregators.CountFieldAggregatorFactory;
+import org.apache.hyracks.dataflow.std.group.aggregators.FloatSumFieldAggregatorFactory;
+import org.apache.hyracks.dataflow.std.group.aggregators.IntSumFieldAggregatorFactory;
 import org.apache.hyracks.dataflow.std.group.aggregators.MultiFieldsAggregatorFactory;
-import org.apache.hyracks.dataflow.std.group.hash.HashGroupOperatorDescriptor;
+import org.apache.hyracks.dataflow.std.group.external.ExternalGroupOperatorDescriptor;
 import org.apache.hyracks.dataflow.std.group.preclustered.PreclusteredGroupOperatorDescriptor;
 import org.apache.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 import org.apache.hyracks.dataflow.std.sort.InMemorySortOperatorDescriptor;
 import org.apache.hyracks.examples.text.WordTupleParserFactory;
+import org.kohsuke.args4j.CmdLineParser;
+import org.kohsuke.args4j.Option;
 
 public class WordCountMain {
     private static class Options {
@@ -84,8 +88,8 @@
         @Option(name = "-hashtable-size", usage = "Hash table size (default: 8191)", required = false)
         public int htSize = 8191;
 
-        @Option(name = "-sortbuffer-size", usage = "Sort buffer size in frames (default: 32768)", required = false)
-        public int sbSize = 32768;
+        @Option(name = "-frame-limit", usage = "Memory limit in frames (default:4)", required = false)
+        public int memFrameLimit = 10;
 
         @Option(name = "-runtime-profiling", usage = "Indicates if runtime profiling should be enabled. (default: false)")
         public boolean runtimeProfiling = false;
@@ -94,6 +98,8 @@
         public int frameSize = 32768;
     }
 
+    private static long fileSize = 0;
+
     public static void main(String[] args) throws Exception {
         Options options = new Options();
         CmdLineParser parser = new CmdLineParser(options);
@@ -102,7 +108,7 @@
         IHyracksClientConnection hcc = new HyracksConnection(options.host, options.port);
 
         JobSpecification job = createJob(parseFileSplits(options.inFileSplits), parseFileSplits(options.outFileSplits),
-                options.algo, options.htSize, options.sbSize, options.format, options.frameSize);
+                options.algo, options.htSize, options.memFrameLimit, options.format, options.frameSize);
 
         long start = System.currentTimeMillis();
         JobId jobId = hcc.startJob(job,
@@ -121,13 +127,15 @@
             if (idx < 0) {
                 throw new IllegalArgumentException("File split " + s + " not well formed");
             }
-            fSplits[i] = new FileSplit(s.substring(0, idx), new FileReference(new File(s.substring(idx + 1))));
+            File file = new File(s.substring(idx + 1));
+            fSplits[i] = new FileSplit(s.substring(0, idx), new FileReference(file));
+            fileSize += file.length();
         }
         return fSplits;
     }
 
     private static JobSpecification createJob(FileSplit[] inSplits, FileSplit[] outSplits, String algo, int htSize,
-            int sbSize, String format, int frameSize) {
+            int frameLimit, String format, int frameSize) {
         JobSpecification spec = new JobSpecification(frameSize);
 
         IFileSplitProvider splitsProvider = new ConstantFileSplitProvider(inSplits);
@@ -144,40 +152,39 @@
         IOperatorDescriptor gBy;
         int[] keys = new int[] { 0 };
         if ("hash".equalsIgnoreCase(algo)) {
-            gBy = new HashGroupOperatorDescriptor(
-                    spec,
-                    keys,
-                    new FieldHashPartitionComputerFactory(keys,
-                            new IBinaryHashFunctionFactory[] { PointableBinaryHashFunctionFactory
-                                    .of(UTF8StringPointable.FACTORY) }),
+            gBy = new ExternalGroupOperatorDescriptor(spec, htSize, fileSize, keys, frameLimit,
                     new IBinaryComparatorFactory[] { PointableBinaryComparatorFactory.of(UTF8StringPointable.FACTORY) },
-                    new MultiFieldsAggregatorFactory(
-                            new IFieldAggregateDescriptorFactory[] { new CountFieldAggregatorFactory(true) }),
-                    groupResultDesc, htSize);
+                    new UTF8StringNormalizedKeyComputerFactory(),
+                    new MultiFieldsAggregatorFactory(new IFieldAggregateDescriptorFactory[] {
+                            new IntSumFieldAggregatorFactory(1, false), new IntSumFieldAggregatorFactory(3, false),
+                            new FloatSumFieldAggregatorFactory(5, false) }),
+                    new MultiFieldsAggregatorFactory(new IFieldAggregateDescriptorFactory[] {
+                            new IntSumFieldAggregatorFactory(1, false), new IntSumFieldAggregatorFactory(2, false),
+                            new FloatSumFieldAggregatorFactory(3, false) }),
+                    groupResultDesc, groupResultDesc, new HashSpillableTableFactory(
+                            new IBinaryHashFunctionFamily[] { UTF8StringBinaryHashFunctionFamily.INSTANCE }));
+
             createPartitionConstraint(spec, gBy, outSplits);
             IConnectorDescriptor scanGroupConn = new MToNPartitioningConnectorDescriptor(spec,
-                    new FieldHashPartitionComputerFactory(keys,
-                            new IBinaryHashFunctionFactory[] { PointableBinaryHashFunctionFactory
-                                    .of(UTF8StringPointable.FACTORY) }));
+                    new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
+                            PointableBinaryHashFunctionFactory.of(UTF8StringPointable.FACTORY) }));
             spec.connect(scanGroupConn, wordScanner, 0, gBy, 0);
         } else {
-            IBinaryComparatorFactory[] cfs = new IBinaryComparatorFactory[] { PointableBinaryComparatorFactory
-                    .of(UTF8StringPointable.FACTORY) };
-            IOperatorDescriptor sorter = "memsort".equalsIgnoreCase(algo) ? new InMemorySortOperatorDescriptor(spec,
-                    keys, new UTF8StringNormalizedKeyComputerFactory(), cfs, wordDesc)
-                    : new ExternalSortOperatorDescriptor(spec, sbSize, keys,
+            IBinaryComparatorFactory[] cfs = new IBinaryComparatorFactory[] {
+                    PointableBinaryComparatorFactory.of(UTF8StringPointable.FACTORY) };
+            IOperatorDescriptor sorter = "memsort".equalsIgnoreCase(algo)
+                    ? new InMemorySortOperatorDescriptor(spec, keys, new UTF8StringNormalizedKeyComputerFactory(), cfs,
+                            wordDesc)
+                    : new ExternalSortOperatorDescriptor(spec, frameLimit, keys,
                             new UTF8StringNormalizedKeyComputerFactory(), cfs, wordDesc);
             createPartitionConstraint(spec, sorter, outSplits);
 
             IConnectorDescriptor scanSortConn = new MToNPartitioningConnectorDescriptor(spec,
-                    new FieldHashPartitionComputerFactory(keys,
-                            new IBinaryHashFunctionFactory[] { PointableBinaryHashFunctionFactory
-                                    .of(UTF8StringPointable.FACTORY) }));
+                    new FieldHashPartitionComputerFactory(keys, new IBinaryHashFunctionFactory[] {
+                            PointableBinaryHashFunctionFactory.of(UTF8StringPointable.FACTORY) }));
             spec.connect(scanSortConn, wordScanner, 0, sorter, 0);
 
-            gBy = new PreclusteredGroupOperatorDescriptor(
-                    spec,
-                    keys,
+            gBy = new PreclusteredGroupOperatorDescriptor(spec, keys,
                     new IBinaryComparatorFactory[] { PointableBinaryComparatorFactory.of(UTF8StringPointable.FACTORY) },
                     new MultiFieldsAggregatorFactory(
                             new IFieldAggregateDescriptorFactory[] { new CountFieldAggregatorFactory(true) }),
@@ -188,8 +195,9 @@
         }
 
         IFileSplitProvider outSplitProvider = new ConstantFileSplitProvider(outSplits);
-        IOperatorDescriptor writer = "text".equalsIgnoreCase(format) ? new PlainFileWriterOperatorDescriptor(spec,
-                outSplitProvider, ",") : new FrameFileWriterOperatorDescriptor(spec, outSplitProvider);
+        IOperatorDescriptor writer = "text".equalsIgnoreCase(format)
+                ? new PlainFileWriterOperatorDescriptor(spec, outSplitProvider, ",")
+                : new FrameFileWriterOperatorDescriptor(spec, outSplitProvider);
         createPartitionConstraint(spec, writer, outSplits);
 
         IConnectorDescriptor gbyPrinterConn = new OneToOneConnectorDescriptor(spec);