apache
/
hadoop
mirrorاز https://github.com/apache/hadoop.git


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483
							<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta content="Apache Forrest" name="Generator">
<meta name="Forrest-version" content="0.7">
<meta name="Forrest-skin-name" content="pelt">
<title>Hadoop Quickstart</title>
<link type="text/css" href="skin/basic.css" rel="stylesheet">
<link media="screen" type="text/css" href="skin/screen.css" rel="stylesheet">
<link media="print" type="text/css" href="skin/print.css" rel="stylesheet">
<link type="text/css" href="skin/profile.css" rel="stylesheet">
<script src="skin/getBlank.js" language="javascript" type="text/javascript"></script><script src="skin/getMenu.js" language="javascript" type="text/javascript"></script><script src="skin/fontsize.js" language="javascript" type="text/javascript"></script>
<link rel="shortcut icon" href="images/favicon.ico">
</head>
<body onload="init()">
<script type="text/javascript">ndeSetTextSize();</script>
<div id="top">
<div class="breadtrail">
<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://lucene.apache.org/">Lucene</a> &gt; <a href="http://lucene.apache.org/hadoop/">Hadoop</a><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script>
</div>
<div class="header">
<div class="grouplogo">
<a href="http://lucene.apache.org/"><img class="logoImage" alt="Lucene" src="images/lucene_green_150.gif" title="Apache Lucene"></a>
</div>
<div class="projectlogo">
<a href="http://lucene.apache.org/hadoop/"><img class="logoImage" alt="Hadoop" src="images/hadoop-logo.jpg" title="Scalable Computing Platform"></a>
</div>
<div class="searchbox">
<form action="http://www.google.com/search" method="get" class="roundtopsmall">
<input value="lucene.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">&nbsp; 
                    <input attr="value" name="Search" value="Search" type="submit">
</form>
</div>
<ul id="tabs">
<li>
<a class="base-not-selected" href="http://lucene.apache.org/hadoop/">Project</a>
</li>
<li>
<a class="base-not-selected" href="http://wiki.apache.org/lucene-hadoop">Wiki</a>
</li>
<li class="current">
<a class="base-selected" href="index.html">Hadoop 0.15 Documentation</a>
</li>
</ul>
</div>
</div>
<div id="main">
<div id="publishedStrip">
<div id="level2tabs"></div>
<script type="text/javascript"><!--
document.write("<text>Last Published:</text> " + document.lastModified);
//  --></script>
</div>
<div class="breadtrail">
             
             &nbsp;
           </div>
<div id="menu">
<div onclick="SwitchMenu('menu_selected_1.1', 'skin/')" id="menu_selected_1.1Title" class="menutitle" style="background-image: url('skin/images/chapter_open.gif');">Documentation</div>
<div id="menu_selected_1.1" class="selectedmenuitemgroup" style="display: block;">
<div class="menuitem">
<a href="index.html">Overview</a>
</div>
<div class="menupage">
<div class="menupagetitle">Quickstart</div>
</div>
<div class="menuitem">
<a href="cluster_setup.html">Cluster Setup</a>
</div>
<div class="menuitem">
<a href="hdfs_design.html">HDFS Architecture</a>
</div>
<div class="menuitem">
<a href="mapred_tutorial.html">Map-Reduce Tutorial</a>
</div>
<div class="menuitem">
<a href="streaming.html">Streaming</a>
</div>
<div class="menuitem">
<a href="api/index.html">API Docs</a>
</div>
<div class="menuitem">
<a href="http://wiki.apache.org/lucene-hadoop/">Wiki</a>
</div>
<div class="menuitem">
<a href="http://wiki.apache.org/lucene-hadoop/FAQ">FAQ</a>
</div>
<div class="menuitem">
<a href="http://lucene.apache.org/hadoop/mailing_lists.html">Mailing Lists</a>
</div>
</div>
<div id="credit"></div>
<div id="roundbottom">
<img style="display: none" class="corner" height="15" width="15" alt="" src="skin/images/rc-b-l-15-1body-2menu-3menu.png"></div>
<div id="credit2"></div>
</div>
<div id="content">
<div title="Portable Document Format" class="pdflink">
<a class="dida" href="quickstart.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
        PDF</a>
</div>
<h1>Hadoop Quickstart</h1>
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#Purpose">Purpose</a>
</li>
<li>
<a href="#PreReqs">Pre-requisites</a>
<ul class="minitoc">
<li>
<a href="#Supported+Platforms">Supported Platforms</a>
</li>
<li>
<a href="#Required+Software">Required Software</a>
<ul class="minitoc">
<li>
<a href="#Additional+requirements+for+Windows">Additional requirements for Windows</a>
</li>
</ul>
</li>
<li>
<a href="#Installing+Software">Installing Software</a>
</li>
</ul>
</li>
<li>
<a href="#Download">Download</a>
</li>
<li>
<a href="#Standalone+Operation">Standalone Operation</a>
</li>
<li>
<a href="#SingleNodeSetup">Pseudo-Distributed Operation</a>
<ul class="minitoc">
<li>
<a href="#Configuration">Configuration</a>
</li>
<li>
<a href="#Setup+passphraseless">Setup passphraseless ssh</a>
</li>
<li>
<a href="#Execution">Execution</a>
</li>
</ul>
</li>
<li>
<a href="#Fully-Distributed+Operation">Fully-Distributed Operation</a>
</li>
</ul>
</div>
  
    
<a name="N1000C"></a><a name="Purpose"></a>
<h2 class="h3">Purpose</h2>
<div class="section">
<p>The purpose of this document is to help users get a single-node Hadoop 
      installation up and running very quickly so that users can get a flavour 
      of the <a href="hdfs_design.html">Hadoop Distributed File System 
      (<acronym title="Hadoop Distributed File System">HDFS</acronym>)</a> and 
      the Map-Reduce framework i.e. perform simple operations on HDFS, run 
      example/simple jobs etc.</p>
</div>
    
    
<a name="N1001E"></a><a name="PreReqs"></a>
<h2 class="h3">Pre-requisites</h2>
<div class="section">
<a name="N10024"></a><a name="Supported+Platforms"></a>
<h3 class="h4">Supported Platforms</h3>
<ul>
          
<li>
            Hadoop has been demonstrated on GNU/Linux clusters with 2000 nodes.
          </li>
          
<li>
            Win32 is supported as a <em>development platform</em>. Distributed 
            operation has not been well tested on Win32, so this is not a 
            <em>production platform</em>.
          </li>
        
</ul>
<a name="N1003A"></a><a name="Required+Software"></a>
<h3 class="h4">Required Software</h3>
<ol>
          
<li>
            Java<sup>TM</sup> 1.5.x, preferably from Sun, must be installed. Set 
            <span class="codefrag">JAVA_HOME</span> to the root of your Java installation.
          </li>
          
<li>
            
<strong>ssh</strong> must be installed and <strong>sshd</strong> must 
            be running to use the Hadoop scripts that manage remote Hadoop 
            daemons.
          </li>
        
</ol>
<a name="N10055"></a><a name="Additional+requirements+for+Windows"></a>
<h4>Additional requirements for Windows</h4>
<ol>
            
<li>
              
<a href="http://www.cygwin.com/">Cygwin</a> - Required for shell 
              support in addition to the required software above. 
            </li>
          
</ol>
<a name="N10067"></a><a name="Installing+Software"></a>
<h3 class="h4">Installing Software</h3>
<p>If your cluster doesn't have the requisite software you will need to
        install it.</p>
<p>For example on Ubuntu Linux:</p>
<p>
          
<span class="codefrag">$ sudo apt-get install ssh</span>
<br>
          
<span class="codefrag">$ sudo apt-get install rsync</span>
        
</p>
<p>On Windows, if you did not install the required software when you 
        installed cygwin, start the cygwin installer and select the packages:</p>
<ul>
          
<li>openssh - the <em>Net</em> category</li>
        
</ul>
</div>
    
    
<a name="N1008B"></a><a name="Download"></a>
<h2 class="h3">Download</h2>
<div class="section">
<p>
        First, you need to get a Hadoop distribution: download a recent 
        <a href="http://lucene.apache.org/hadoop/releases.html">stable release</a> and unpack it.
      </p>
<p>
        Once done, in the distribution edit the file 
        <span class="codefrag">conf/hadoop-env.sh</span> to define at least <span class="codefrag">JAVA_HOME</span>.
      </p>
<p>
	    Try the following command:<br>
        
<span class="codefrag">$ bin/hadoop</span>
<br>
        This will display the usage documentation for the <strong>hadoop</strong> 
        script.
      </p>
</div>
    
    
<a name="N100AE"></a><a name="Standalone+Operation"></a>
<h2 class="h3">Standalone Operation</h2>
<div class="section">
<p>By default, Hadoop is configured to run things in a non-distributed 
      mode, as a single Java process. This is useful for debugging.</p>
<p>
        The following example copies the unpacked <span class="codefrag">conf</span> directory to 
        use as input and then finds and displays every match of the given regular 
        expression. Output is written to the given <span class="codefrag">output</span> directory.
        <br>
        
<span class="codefrag">$ mkdir input</span>
<br>
        
<span class="codefrag">$ cp conf/*.xml input</span>
<br>
        
<span class="codefrag">
          $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+'
        </span>
<br>
        
<span class="codefrag">$ cat output/*</span>
      
</p>
</div>
    
    
<a name="N100D2"></a><a name="SingleNodeSetup"></a>
<h2 class="h3">Pseudo-Distributed Operation</h2>
<div class="section">
<p>Hadoop can also be run on a single-node in a pseudo-distributed mode 
	  where each Hadoop daemon runs in a separate Java process.</p>
<a name="N100DB"></a><a name="Configuration"></a>
<h3 class="h4">Configuration</h3>
<p>Use the following <span class="codefrag">conf/hadoop-site.xml</span>:</p>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
        
<tr>
<td colspan="1" rowspan="1">&lt;configuration&gt;</td>
</tr>

          
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&lt;property&gt;</td>
</tr>
            
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&nbsp;&nbsp;&lt;name&gt;fs.default.name&lt;/name&gt;</td>
</tr>
            
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&nbsp;&nbsp;&lt;value&gt;localhost:9000&lt;/value&gt;</td>
</tr>
          
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&lt;/property&gt;</td>
</tr>

          
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&lt;property&gt;</td>
</tr>
            
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&nbsp;&nbsp;&lt;name&gt;mapred.job.tracker&lt;/name&gt;</td>
</tr>
            
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&nbsp;&nbsp;&lt;value&gt;localhost:9001&lt;/value&gt;</td>
</tr>
          
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&lt;/property&gt;</td>
</tr>

          
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&lt;property&gt;</td>
</tr>
            
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&nbsp;&nbsp;&lt;name&gt;dfs.replication&lt;/name&gt;</td>
</tr>
            
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&nbsp;&nbsp;&lt;value&gt;1&lt;/value&gt;</td>
</tr>
          
<tr>
<td colspan="1" rowspan="1">&nbsp;&nbsp;&lt;/property&gt;</td>
</tr>

        
<tr>
<td colspan="1" rowspan="1">&lt;/configuration&gt;</td>
</tr>
        
</table>
<a name="N1013F"></a><a name="Setup+passphraseless"></a>
<h3 class="h4">Setup passphraseless ssh</h3>
<p>
          Now check that you can ssh to the localhost without a passphrase:<br>
          
<span class="codefrag">$ ssh localhost</span>
        
</p>
<p>
          If you cannot ssh to localhost without a passphrase, execute the 
          following commands:<br>
   		  
<span class="codefrag">$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa</span>
<br>
		  
<span class="codefrag">$ cat ~/.ssh/id_dsa.pub &gt;&gt; ~/.ssh/authorized_keys</span>
		
</p>
<a name="N1015C"></a><a name="Execution"></a>
<h3 class="h4">Execution</h3>
<p>
          Format a new distributed-filesystem:<br>
          
<span class="codefrag">$ bin/hadoop namenode -format</span>
        
</p>
<p>
		  Start The hadoop daemons:<br>
          
<span class="codefrag">$ bin/start-all.sh</span>
        
</p>
<p>The hadoop daemon log output is written to the 
        <span class="codefrag">${HADOOP_LOG_DIR}</span> directory (defaults to 
        <span class="codefrag">${HADOOP_HOME}/logs</span>).</p>
<p>Browse the web-interface for the NameNode and the JobTracker, by
        default they are available at:</p>
<ul>
          
<li>
            
<span class="codefrag">NameNode</span> - 
            <a href="http://localhost:50070/">http://localhost:50070/</a>
          
</li>
          
<li>
            
<span class="codefrag">JobTracker</span> - 
            <a href="http://localhost:50030/">http://localhost:50030/</a>
          
</li>
        
</ul>
<p>
          Copy the input files into the distributed filesystem:<br>
		  
<span class="codefrag">$ bin/hadoop dfs -put conf input</span>
		
</p>
<p>
          Run some of the examples provided:<br>
          
<span class="codefrag">
            $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+'
          </span>
        
</p>
<p>Examine the output files:</p>
<p>
          Copy the output files from the distributed filesystem to the local 
          filesytem and examine them:<br>
          
<span class="codefrag">$ bin/hadoop dfs -get output output</span>
<br>
          
<span class="codefrag">$ cat output/*</span>
        
</p>
<p> or </p>
<p>
          View the output files on the distributed filesystem:<br>
          
<span class="codefrag">$ bin/hadoop dfs -cat output/*</span>
        
</p>
<p>
		  When you're done, stop the daemons with:<br>
		  
<span class="codefrag">$ bin/stop-all.sh</span>
		
</p>
</div>
    
    
<a name="N101C9"></a><a name="Fully-Distributed+Operation"></a>
<h2 class="h3">Fully-Distributed Operation</h2>
<div class="section">
<p>Information on setting up fully-distributed non-trivial clusters
	  can be found <a href="cluster_setup.html">here</a>.</p>
</div>
    
    
<p>
      
<em>Java and JNI are trademarks or registered trademarks of 
      Sun Microsystems, Inc. in the United States and other countries.</em>
    
</p>
    
  
</div>
<div class="clearboth">&nbsp;</div>
</div>
<div id="footer">
<div class="lastmodified">
<script type="text/javascript"><!--
document.write("<text>Last Published:</text> " + document.lastModified);
//  --></script>
</div>
<div class="copyright">
        Copyright &copy;
         2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
</div>
</div>
</body>
</html>