Fixed ant issues and updated README.

README

@@ -4,7 +4,8 @@ DESCRIPTION
 Originally, Dumbo was just a simple Python module that made writing 
 and running Streaming programs very easy, but now it also consists 
 of some helper code in Java (although it can still be used without 
-the Java code). 
+the Java code). More generally, Dumbo can be considered to be a 
+convenient Python API for writing MapReduce programs.
 
 
 INSTALLATION
@@ -14,9 +15,12 @@ The Java code gets build together with the rest of Hadoop when the
 "dumbo/" directory is put in Hadoop's "src/contrib/", and the Python 
 module can be installed by running
 
-sudo ant install_pymod
+sudo ant -f build-pymod.xml install_pymod
+
+in the "src/contrib/dumbo" directory. If the dir "dumbo/" is a subdir
+of Hadoop's "src/contrib/", then the -f option can be omitted:
 
-in the "src/contrib/dumbo" directory.
+sudo ant install_pymod
 
 
 USAGE

build-pymod.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0"?>
+
+<!--
+   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.
+-->
+
+<project name="dumbo_pymod" default="install_pymod">
+
+  <property name="src.test" location="${basedir}/src/test/java"/>
+
+  <target name="install_pymod">
+    <exec executable="/bin/sh">
+      <arg value="-c" />
+      <arg value="cd ${basedir}/src/python/; python setup.py install; python setup.py clean -a" />
+    </exec>
+  </target>
+
+  <target name="test_pymod">
+    <exec executable="/bin/sh" resultproperty="pymodtest.failedTests">
+      <arg value="-c" />
+      <arg value="cd ${basedir}/src/test/python/; python main.py" />
+    </exec>
+    <exec executable="/bin/sh">
+      <arg value="-c" />
+      <arg value="cd ${basedir}/src/test/python/; rm *.pyc" />
+    </exec>
+    <condition property="pymodtest.success">
+      <equals arg1="${pymodtest.failedTests}" arg2="0"/>
+    </condition>
+    <fail message="TestCases failed. ${pymodtest.failedTests} failed to run successfully." unless="pymodtest.success"/>
+  </target>
+
+</project>

build.xml

@@ -23,15 +23,11 @@ to call at top-level: ant deploy-contrib compile-core-test
 -->
 <project name="dumbo" default="jar">
 
-  <property name="src.test" location="${basedir}/src/test/java"/>
-
-  <!-- dummy compile target -->
-  <target name="compile" />
-
-  <import file="../build-contrib.xml" optional="true" />
+  <import file="../build-contrib.xml" />
+  <import file="build-pymod.xml" />
 
   <!-- Override jar target to specify main class -->
-  <target name="jar" depends="compile">
+  <target name="jar" if="buildcontrib" depends="compile">
     <jar
       jarfile="${build.dir}/hadoop-${version}-${name}.jar"
       basedir="${build.classes}"
@@ -42,26 +38,4 @@ to call at top-level: ant deploy-contrib compile-core-test
     </jar>
   </target>
 
-  <target name="install_pymod">
-    <exec executable="/bin/sh">
-      <arg value="-c" />
-      <arg value="cd ${basedir}/src/python/; python setup.py install; python setup.py clean -a" />
-    </exec>
-  </target>
-
-  <target name="test_pymod">
-    <exec executable="/bin/sh" resultproperty="pymodtest.failedTests">
-      <arg value="-c" />
-      <arg value="cd ${basedir}/src/test/python/; python main.py" />
-    </exec>
-    <exec executable="/bin/sh">
-      <arg value="-c" />
-      <arg value="cd ${basedir}/src/test/python/; rm *.pyc" />
-    </exec>
-    <condition property="pymodtest.success">
-      <equals arg1="${pymodtest.failedTests}" arg2="0"/>
-    </condition>
-    <fail message="TestCases failed. ${pymodtest.failedTests} failed to run successfully." unless="pymodtest.success"/>
-  </target>
-
 </project>