title: Jars for hadoop mapreduce
body: <p>I am following <a href="http://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html" rel="nofollow">this hadoop mapreduce tutorial</a> given by Apache. 
  The Java code given there uses these Apache-hadoop classes: </p>
  
  <pre><code>import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.IntWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.mapreduce.Job;
  import org.apache.hadoop.mapreduce.Mapper;
  import org.apache.hadoop.mapreduce.Reducer;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  </code></pre>
  
  <p>But I could not understand where to download these Jars from. On searching internet for these classes I could see they are available <a href="http://www.java2s.com/Code/Jar/h/Downloadhadoopmapred0210jar.htm" rel="nofollow">here</a>. </p>
  
  <p>But what is the formal/authentic Apache repository for these and Jars?</p>
  
  <p>If jars are shipped along with hadoop, please let me know the path.</p>
  
  <p>EDIT : Other question does not give clear instructions. 
  I found answer as follows</p>
  
  <p><a href="http://www.tutorialspoint.com/hadoop/hadoop_mapreduce.htm" rel="nofollow">This tutorial</a> mentions: </p>
  
  <blockquote>
    <p>Download Hadoop-core-1.2.1.jar, which is used to compile and execute the MapReduce program. Visit the following link <a href="http://mvnrepository.com/artifact/org.apache.hadoop/hadoop-core/1.2.1" rel="nofollow">http://mvnrepository.com/artifact/org.apache.hadoop/hadoop-core/1.2.1</a> to download the jar.</p>
  </blockquote>
  
  <p>So this looks authentic repository. </p>