diff --git a/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/base/IDriver.java b/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/base/IDriver.java
index d7f8243..ccdd965 100644
--- a/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/base/IDriver.java
+++ b/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/base/IDriver.java
@@ -27,6 +27,8 @@
         OUTER_JOIN_SINGLE_SORT
     }
 
+    public void runJob(PregelixJob job, String ipAddress, int port) throws HyracksException;
+
     public void runJob(PregelixJob job, Plan planChoice, String ipAddress, int port, boolean profiling)
             throws HyracksException;
 }
diff --git a/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java b/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java
index e8fdd68..0b99e71 100644
--- a/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java
+++ b/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java
@@ -64,6 +64,11 @@
     }
 
     @Override
+    public void runJob(PregelixJob job, String ipAddress, int port) throws HyracksException {
+        runJob(job, Plan.OUTER_JOIN, ipAddress, port, false);
+    }
+
+    @Override
     public void runJob(PregelixJob job, Plan planChoice, String ipAddress, int port, boolean profiling)
             throws HyracksException {
         applicationName = exampleClass.getSimpleName() + UUID.randomUUID();
diff --git a/pregelix/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/client/Client.java b/pregelix/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/client/Client.java
index b02ce03..53af127 100644
--- a/pregelix/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/client/Client.java
+++ b/pregelix/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/client/Client.java
@@ -43,11 +43,11 @@
         @Option(name = "-ip", usage = "ip address of cluster controller", required = true)
         public String ipAddress;
 
-        @Option(name = "-port", usage = "port of cluster controller", required = true)
+        @Option(name = "-port", usage = "port of cluster controller", required = false)
         public int port;
 
-        @Option(name = "-plan", usage = "query plan choice", required = true)
-        public Plan planChoice;
+        @Option(name = "-plan", usage = "query plan choice", required = false)
+        public Plan planChoice = Plan.OUTER_JOIN;
 
         @Option(name = "-vnum", usage = "number of vertices", required = false)
         public long numVertices;