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HADOOP-2390. Added documentation for user-controls for intermediate map-outputs & final job-outputs and native-hadoop libraries.

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@608973 13f79535-47bb-0310-9956-ffa450edef68
Arun Murthy 17 年之前
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共有 44 個文件被更改，包括 1747 次插入 和 371 次删除
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+ 3 - 0
CHANGES.txt
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@@ -152,6 +152,9 @@ Trunk (unreleased changes)
 
     HADOOP-1719. Improves the utilization of shuffle copier threads.
 
     (Amar Kamat via ddas)
 
  
+    HADOOP-2390. Added documentation for user-controls for intermediate
 
+    map-outputs & final job-outputs and native-hadoop libraries. (acmurthy) 
+ 
   OPTIMIZATIONS
 
 
     HADOOP-1898.  Release the lock protecting the last time of the last stack

+ 75 - 9
docs/cluster_setup.html
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@@ -1,9 +1,9 @@
 
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 
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-<meta name="Forrest-version" content="0.7">
 
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 <body onload="init()">
 
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+<!--+
 
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+    +-->
 
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-<a class="base-selected" href="index.html">Hadoop 0.16 Documentation</a>
 
+<a class="selected" href="index.html">Hadoop 0.16 Documentation</a>
 
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+
 
              &nbsp;
 
            </div>
 
+<!--+
 
+    |start Menu, mainarea
 
+    +-->
 
+<!--+
 
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+    +-->
 
 <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>
 
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@@ -75,6 +120,9 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <a href="mapred_tutorial.html">Map-Reduce Tutorial</a>
 
 </div>
 
 <div class="menuitem">
 
+<a href="native_libraries.html">Native Hadoop Libraries</a>
 
+</div>
 
+<div class="menuitem">
 
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 <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>
 
+<!--+
 
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 <a class="dida" href="cluster_setup.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
 
@@ -627,18 +684,27 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 </div>
 
   
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         Copyright &copy;
 
          2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
 
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docs/hdfs_design.html
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@@ -1,9 +1,9 @@
 
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 
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 <title> 
       The Hadoop Distributed File System: Architecture and Design
 
@@ -18,46 +18,91 @@
 
 <body onload="init()">
 
 <script type="text/javascript">ndeSetTextSize();</script>
 
 <div id="top">
 
+<!--+
 
+    |breadtrail
 
+    +-->
 
 <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>
 
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+<!--+
 
+    |header
 
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+<!--+
 
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 <a href="http://lucene.apache.org/hadoop/"><img class="logoImage" alt="Hadoop" src="images/hadoop-logo.jpg" title="Scalable Computing Platform"></a>
 
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-                    <input attr="value" name="Search" value="Search" type="submit">
 
+                    <input name="Search" value="Search" type="submit">
 
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+<!--+
 
+    |end search
 
+    +-->
 
+<!--+
 
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-<a class="base-selected" href="index.html">Hadoop 0.16 Documentation</a>
 
+<a class="selected" href="index.html">Hadoop 0.16 Documentation</a>
 
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+document.write("Last Published: " + document.lastModified);
 
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+    +-->
 
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-             
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+<!--+
 
+    |start Menu, mainarea
 
+    +-->
 
+<!--+
 
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+    +-->
 
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 <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>
 
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 <a href="mapred_tutorial.html">Map-Reduce Tutorial</a>
 
 </div>
 
 <div class="menuitem">
 
+<a href="native_libraries.html">Native Hadoop Libraries</a>
 
+</div>
 
+<div class="menuitem">
 
 <a href="streaming.html">Streaming</a>
 
 </div>
 
 <div class="menuitem">
 
@@ -98,8 +146,17 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <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>
 
+<!--+
 
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@@ -279,8 +336,8 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <p>
 
       HDFS has a master/slave architecture. An HDFS cluster consists of a single <em>Namenode</em>, a master server that manages the file system namespace and regulates access to files by clients. In addition, there are a number of <em>Datanodes</em>, usually one per node in the cluster, which manage storage attached to the nodes that they run on. HDFS exposes a file system namespace and allows user data to be stored in files. Internally, a file is split into one or more blocks and these blocks are stored in a set of Datanodes. The Namenode executes file system namespace operations like opening, closing, and renaming files and directories. It also determines the mapping of blocks to Datanodes. The Datanodes are responsible for serving read and write requests from the file system&rsquo;s clients. The Datanodes also perform block creation, deletion, and replication upon instruction from the Namenode.
 
       </p>
 
-<div style="text-align: center;">
 
-<img class="figure" alt="HDFS Architecture" src="images/hdfsarchitecture.gif"></div>
 
+<div id="" style="text-align: center;">
 
+<img id="" class="figure" alt="HDFS Architecture" src="images/hdfsarchitecture.gif"></div>
 
 <p>
 
       The Namenode and Datanode are pieces of software designed to run on commodity machines. These machines typically run a GNU/Linux operating system (<acronym title="operating system">OS</acronym>). HDFS is built using the Java language; any machine that supports Java can run the Namenode or the Datanode software. Usage of the highly portable Java language means that HDFS can be deployed on a wide range of machines. A typical deployment has a dedicated machine that runs only the Namenode software. Each of the other machines in the cluster runs one instance of the Datanode software. The architecture does not preclude running multiple Datanodes on the same machine but in a real deployment that is rarely the case.
 
       </p>
 
@@ -315,8 +372,8 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <p>
 
       The Namenode makes all decisions regarding replication of blocks. It periodically receives a <em>Heartbeat</em> and a <em>Blockreport</em> from each of the Datanodes in the cluster. Receipt of a Heartbeat implies that the Datanode is functioning properly. A Blockreport contains a list of all blocks on a Datanode. 
     </p>
 
-<div style="text-align: center;">
 
-<img class="figure" alt="HDFS Datanodes" src="images/hdfsdatanodes.gif"></div>
 
+<div id="" style="text-align: center;">
 
+<img id="" class="figure" alt="HDFS Datanodes" src="images/hdfsdatanodes.gif"></div>
 
 <a name="N100AC"></a><a name="Replica+Placement%3A+The+First+Baby+Steps"></a>
 
 <h3 class="h4"> Replica Placement: The First Baby Steps </h3>
 
 <p>
 
@@ -392,7 +449,7 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <a name="N1013F"></a><a name="Data+Integrity"></a>
 
 <h3 class="h4"> Data Integrity </h3>
 
 <p>
 
-        
+        <!-- XXX "checksum checking" sounds funny -->
 
         It is possible that a block of data fetched from a Datanode arrives corrupted. This corruption can occur because of faults in a storage device, network faults, or buggy software. The HDFS client software implements checksum checking on the contents of HDFS files. When a client creates an HDFS file, it computes a checksum of each block of the file and stores these checksums in a separate hidden file in the same HDFS namespace. When a client retrieves file contents it verifies that the data it received from each Datanode matches the checksum stored in the associated checksum file. If not, then the client can opt to retrieve that block from another Datanode that has a replica of that block.
 
         </p>
 
 <a name="N1014B"></a><a name="Metadata+Disk+Failure"></a>
 
@@ -561,18 +618,27 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <font size="-2">by&nbsp;Dhruba Borthakur</font>
 
 </p>
 
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 //  --></script>
 
 </div>
 
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         Copyright &copy;
 
          2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
 
 </div>
 
+<!--+
 
+    |end bottomstrip
 
+    +-->
 
 </div>
 
 </body>
 
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+ 9 - 9
docs/hdfs_design.pdf


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docs/hod.html
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 
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+<meta name="Forrest-version" content="0.8">
 
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 <title> 
       Hadoop On Demand
 
@@ -18,46 +18,91 @@
 
 <body onload="init()">
 
 <script type="text/javascript">ndeSetTextSize();</script>
 
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+<!--+
 
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@@ -77,6 +122,9 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <a href="mapred_tutorial.html">Map-Reduce Tutorial</a>
 
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docs/mapred_tutorial.html
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 <p>
 
 <span class="codefrag">Counters</span> represent global counters, defined either by 
@@ -1616,7 +1681,7 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
           Reporter.incrCounter(Enum, long)</a> in the <span class="codefrag">map</span> and/or 
           <span class="codefrag">reduce</span> methods. These counters are then globally 
           aggregated by the framework.</p>
 
-<a name="N109D7"></a><a name="DistributedCache"></a>
 
+<a name="N109EC"></a><a name="DistributedCache"></a>
 
 <h4>DistributedCache</h4>
 
 <p>
 
 <a href="api/org/apache/hadoop/filecache/DistributedCache.html">
 
@@ -1648,7 +1713,7 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <span class="codefrag">DistributedCache</span> tracks the modification timestamps of 
           the cached files. Clearly the cache files should not be modified by 
           the application or externally while the job is executing.</p>
 
-<a name="N10A11"></a><a name="Tool"></a>
 
+<a name="N10A26"></a><a name="Tool"></a>
 
 <h4>Tool</h4>
 
 <p>The <a href="api/org/apache/hadoop/util/Tool.html">Tool</a> 
           interface supports the handling of generic Hadoop command-line options.
 
@@ -1688,7 +1753,7 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
             </span>
 
           
 </p>
 
-<a name="N10A43"></a><a name="IsolationRunner"></a>
 
+<a name="N10A58"></a><a name="IsolationRunner"></a>
 
 <h4>IsolationRunner</h4>
 
 <p>
 
 <a href="api/org/apache/hadoop/mapred/IsolationRunner.html">
 
@@ -1712,21 +1777,73 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <p>
 
 <span class="codefrag">IsolationRunner</span> will run the failed task in a single 
           jvm, which can be in the debugger, over precisely the same input.</p>
 
-<a name="N10A76"></a><a name="JobControl"></a>
 
+<a name="N10A8B"></a><a name="JobControl"></a>
 
 <h4>JobControl</h4>
 
 <p>
 
 <a href="api/org/apache/hadoop/mapred/jobcontrol/package-summary.html">
 
           JobControl</a> is a utility which encapsulates a set of Map-Reduce jobs
 
           and their dependencies.</p>
 
+<a name="N10A98"></a><a name="Data+Compression"></a>
 
+<h4>Data Compression</h4>
 
+<p>Hadoop Map-Reduce provides facilities for the application-writer to
 
+          specify compression for both intermediate map-outputs and the
 
+          job-outputs i.e. output of the reduces. It also comes bundled with
 
+          <a href="api/org/apache/hadoop/io/compress/CompressionCodec.html">
 
+          CompressionCodec</a> implementations for the 
+          <a href="http://www.zlib.net/">zlib</a> and <a href="http://www.oberhumer.com/opensource/lzo/">lzo</a> compression 
+          algorithms. The <a href="http://www.gzip.org/">gzip</a> file format is also
 
+          supported.</p>
 
+<p>Hadoop also provides native implementations of the above compression
 
+          codecs for reasons of both performance (zlib) and non-availability of
 
+          Java libraries (lzo). More details on their usage and availability are
 
+          available <a href="native_libraries.html">here</a>.</p>
 
+<a name="N10AB8"></a><a name="Intermediate+Outputs"></a>
 
+<h5>Intermediate Outputs</h5>
 
+<p>Applications can control compression of intermediate map-outputs
 
+            via the 
+            <a href="api/org/apache/hadoop/mapred/JobConf.html#setCompressMapOutput(boolean)">
 
+            JobConf.setCompressMapOutput(boolean)</a> api and the 
+            <span class="codefrag">CompressionCodec</span> to be used via the
 
+            <a href="api/org/apache/hadoop/mapred/JobConf.html#setMapOutputCompressorClass(java.lang.Class)">
 
+            JobConf.setMapOutputCompressorClass(Class)</a> api. Since 
+            the intermediate map-outputs are always stored in the 
+            <a href="api/org/apache/hadoop/io/SequenceFile.html">SequenceFile</a>
 
+            format, the
 
+            <a href="api/org/apache/hadoop/io/SequenceFile.CompressionType.html">
 
+            SequenceFile.CompressionType</a> (i.e.
 
+            <a href="api/org/apache/hadoop/io/SequenceFile.CompressionType.html#RECORD">
 
+            RECORD</a> / 
+            <a href="api/org/apache/hadoop/io/SequenceFile.CompressionType.html#BLOCK">
 
+            BLOCK</a> - defaults to <span class="codefrag">RECORD</span>) can be specified via the
 
+            <a href="api/org/apache/hadoop/mapred/JobConf.html#setMapOutputCompressionType(org.apache.hadoop.io.SequenceFile.CompressionType)">
 
+            JobConf.setMapOutputCompressionType(SequenceFile.CompressionType)</a> 
+            api.</p>
 
+<a name="N10AE4"></a><a name="Job+Outputs"></a>
 
+<h5>Job Outputs</h5>
 
+<p>Applications can control compression of job-outputs via the
 
+            <a href="api/org/apache/hadoop/mapred/OutputFormatBase.html#setCompressOutput(org.apache.hadoop.mapred.JobConf,%20boolean)">
 
+            OutputFormatBase.setCompressOutput(JobConf, boolean)</a> api and the 
+            <span class="codefrag">CompressionCodec</span> to be used can be specified via the
 
+            <a href="api/org/apache/hadoop/mapred/OutputFormatBase.html#setOutputCompressorClass(org.apache.hadoop.mapred.JobConf,%20java.lang.Class)">
 
+            OutputFormatBase.setOutputCompressorClass(JobConf, Class)</a> api.</p>
 
+<p>If the job outputs are to be stored in the 
+            <a href="api/org/apache/hadoop/mapred/SequenceFileOutputFormat.html">
 
+            SequenceFileOutputFormat</a>, the required
 
+            <span class="codefrag">SequenceFile.CompressionType</span> (i.e. <span class="codefrag">RECORD</span> / 
+            <span class="codefrag">BLOCK</span> - defaults to <span class="codefrag">RECORD</span>)can be specified 
+            via the 
+            <a href="api/org/apache/hadoop/mapred/SequenceFileOutputFormat.html#setOutputCompressionType(org.apache.hadoop.mapred.JobConf,%20org.apache.hadoop.io.SequenceFile.CompressionType)">
 
+            SequenceFileOutputFormat.setOutputCompressionType(JobConf, 
+            SequenceFile.CompressionType)</a> api.</p>
 
 </div>
 
 
     
-<a name="N10A85"></a><a name="Example%3A+WordCount+v2.0"></a>
 
+<a name="N10B13"></a><a name="Example%3A+WordCount+v2.0"></a>
 
 <h2 class="h3">Example: WordCount v2.0</h2>
 
 <div class="section">
 
 <p>Here is a more complete <span class="codefrag">WordCount</span> which uses many of the
 
       features provided by the Map-Reduce framework we discussed so far:</p>
 
-<a name="N10A91"></a><a name="Source+Code-N10A91"></a>
 
+<a name="N10B1F"></a><a name="Source+Code-N10B1F"></a>
 
 <h3 class="h4">Source Code</h3>
 
 <table class="ForrestTable" cellspacing="1" cellpadding="4">
 
           
@@ -2904,7 +3021,7 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 </tr>
 
         
 </table>
 
-<a name="N111C3"></a><a name="Sample+Runs"></a>
 
+<a name="N11251"></a><a name="Sample+Runs"></a>
 
 <h3 class="h4">Sample Runs</h3>
 
 <p>Sample text-files as input:</p>
 
 <p>
 
@@ -3069,7 +3186,7 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <br>
 
         
 </p>
 
-<a name="N11293"></a><a name="Salient+Points"></a>
 
+<a name="N11321"></a><a name="Salient+Points"></a>
 
 <h3 class="h4">Salient Points</h3>
 
 <p>The second version of <span class="codefrag">WordCount</span> improves upon the 
         previous one by using some features offered by the Map-Reduce framework:
 
@@ -3114,18 +3231,27 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
     
   
 </div>
 
+<!--+
 
+    |end content
 
+    +-->
 
 <div class="clearboth">&nbsp;</div>
 
 </div>
 
 <div id="footer">
 
+<!--+
 
+    |start bottomstrip
 
+    +-->
 
 <div class="lastmodified">
 
 <script type="text/javascript"><!--
 
-document.write("<text>Last Published:</text> " + document.lastModified);
 
+document.write("Last Published: " + document.lastModified);
 
 //  --></script>
 
 </div>
 
 <div class="copyright">
 
         Copyright &copy;
 
          2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
 
 </div>
 
+<!--+
 
+    |end bottomstrip
 
+    +-->
 
 </div>
 
 </body>
 
 </html>

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+ 3 - 3
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+ 404 - 0
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查看文件 

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+<a class="dida" href="native_libraries.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
 
+        PDF</a>
 
+</div>
 
+<h1>Native Hadoop Libraries</h1>
 
+<div id="minitoc-area">
 
+<ul class="minitoc">
 
+<li>
 
+<a href="#Purpose">Purpose</a>
 
+</li>
 
+<li>
 
+<a href="#Components">Components</a>
 
+</li>
 
+<li>
 
+<a href="#Usage">Usage</a>
 
+</li>
 
+<li>
 
+<a href="#Supported+Platforms">Supported Platforms</a>
 
+</li>
 
+<li>
 
+<a href="#Building+Native+Hadoop+Libraries">Building Native Hadoop Libraries</a>
 
+<ul class="minitoc">
 
+<li>
 
+<a href="#Notes">Notes</a>
 
+</li>
 
+</ul>
 
+</li>
 
+</ul>
 
+</div>
 
+  
+    
+<a name="N1000C"></a><a name="Purpose"></a>
 
+<h2 class="h3">Purpose</h2>
 
+<div class="section">
 
+<p>Hadoop has native implementations of certain components for reasons of 
+      both performace &amp; non-availability of Java implementations. These 
+      components are available in a single, dynamically-linked, native library. 
+      On the *nix platform it is <em>libhadoop.so</em>. This document describes 
+      the usage &amp; details on how to build the native libraries.</p>
 
+</div>
 
+    
+    
+<a name="N10019"></a><a name="Components"></a>
 
+<h2 class="h3">Components</h2>
 
+<div class="section">
 
+<p>Hadoop currently has the following 
+      <a href="api/org/apache/hadoop/io/compress/CompressionCodec.html">
 
+      compression codecs</a> as the native components:</p>
 
+<ul>
 
+        
+<li>
 
+<a href="http://www.zlib.net/">zlib</a>
 
+</li>
 
+        
+<li>
 
+<a href="http://www.gzip.org/">gzip</a>
 
+</li>
 
+        
+<li>
 
+<a href="http://www.oberhumer.com/opensource/lzo/">lzo</a>
 
+</li>
 
+      
+</ul>
 
+<p>Of the above, the availability of native hadoop libraries is imperative 
+      for the lzo and gzip compression codecs to work.</p>
 
+</div>
 
+
 
+    
+<a name="N1003C"></a><a name="Usage"></a>
 
+<h2 class="h3">Usage</h2>
 
+<div class="section">
 
+<p>It is fairly simple to use the native hadoop libraries:</p>
 
+<ul>
 
+        
+<li>
 
+          Take a look at the 
+          <a href="#Supported+Platforms">supported platforms</a>.
 
+        </li>
 
+        
+<li>
 
+          Either <a href="http://lucene.apache.org/hadoop/releases.html#Download">download</a> the pre-built 
+          32-bit i386-Linux native hadoop libraries (available as part of hadoop 
+          distribution in <span class="codefrag">lib/native</span> directory) or 
+          <a href="#Building+Native+Hadoop+Libraries">build</a> them yourself.
 
+        </li>
 
+        
+<li>
 
+          Ensure you have either or both of <strong>&gt;zlib-1.2</strong> and 
+          <strong>&gt;lzo2.0</strong> packages for your platform installed; 
+          depending on your needs.
 
+        </li>
 
+      
+</ul>
 
+<p>The <span class="codefrag">bin/hadoop</span> script ensures that the native hadoop 
+      library is on the library path via the system property 
+      <em>-Djava.library.path=&lt;path&gt;</em>.</p>
 
+<p>To check everything went alright check the hadoop log files for:</p>
 
+<p>
 
+        
+<span class="codefrag">
 
+          DEBUG util.NativeCodeLoader - Trying to load the custom-built 
+          native-hadoop library... 
+        </span>
 
+<br>
 
+        
+<span class="codefrag">
 
+          INFO  util.NativeCodeLoader - Loaded the native-hadoop library
 
+        </span>
 
+      
+</p>
 
+<p>If something goes wrong, then:</p>
 
+<p>
 
+        
+<span class="codefrag">
 
+          INFO util.NativeCodeLoader - Unable to load native-hadoop library for 
+          your platform... using builtin-java classes where applicable
 
+        </span>
 
+      
+</p>
 
+</div>
 
+    
+    
+<a name="N10086"></a><a name="Supported+Platforms"></a>
 
+<h2 class="h3">Supported Platforms</h2>
 
+<div class="section">
 
+<p>Hadoop native library is supported only on *nix platforms only.
 
+      Unfortunately it is known not to work on <a href="http://www.cygwin.com/">Cygwin</a> 
+      and <a href="http://www.apple.com/macosx">Mac OS X</a> and has mainly been used on the 
+      GNU/Linux platform.</p>
 
+<p>It has been tested on the following GNU/Linux distributions:</p>
 
+<ul>
 
+        
+<li>
 
+          
+<a href="http://www.redhat.com/rhel/">RHEL4</a>/<a href="http://fedora.redhat.com/">Fedora</a>
 
+        
+</li>
 
+        
+<li>
 
+<a href="http://www.ubuntu.com/">Ubuntu</a>
 
+</li>
 
+        
+<li>
 
+<a href="http://www.gentoo.org/">Gentoo</a>
 
+</li>
 
+      
+</ul>
 
+<p>On all the above platforms a 32/64 bit Hadoop native library will work 
+      with a respective 32/64 bit jvm.</p>
 
+</div>
 
+    
+    
+<a name="N100B6"></a><a name="Building+Native+Hadoop+Libraries"></a>
 
+<h2 class="h3">Building Native Hadoop Libraries</h2>
 
+<div class="section">
 
+<p>Hadoop native library is written in 
+      <a href="http://en.wikipedia.org/wiki/ANSI_C">ANSI C</a> and built using 
+      the GNU autotools-chain (autoconf, autoheader, automake, autoscan, libtool). 
+      This means it should be straight-forward to build them on any platform with 
+      a standards compliant C compiler and the GNU autotools-chain. 
+      See <a href="#Supported+Platforms">supported platforms</a>.</p>
 
+<p>In particular the various packages you would need on the target 
+      platform are:</p>
 
+<ul>
 
+        
+<li>
 
+          C compiler (e.g. <a href="http://gcc.gnu.org/">GNU C Compiler</a>)
 
+        </li>
 
+        
+<li>
 
+          GNU Autools Chain: 
+          <a href="http://www.gnu.org/software/autoconf/">autoconf</a>, 
+          <a href="http://www.gnu.org/software/automake/">automake</a>, 
+          <a href="http://www.gnu.org/software/libtool/">libtool</a>
 
+        
+</li>
 
+        
+<li> 
+          zlib-development package (stable version &gt;= 1.2.0)
 
+        </li>
 
+        
+<li> 
+          lzo-development package (stable version &gt;= 2.0)
 
+        </li> 
+      
+</ul>
 
+<p>Once you have the pre-requisites use the standard <span class="codefrag">build.xml</span> 
+      and pass along the <span class="codefrag">compile.native</span> flag (set to 
+      <span class="codefrag">true</span>) to build the native hadoop library:</p>
 
+<p>
 
+<span class="codefrag">$ ant -Dcompile.native=true &lt;target&gt;</span>
 
+</p>
 
+<p>The native hadoop library is not built by default since not everyone is 
+      interested in building them.</p>
 
+<p>You should see the newly-built native hadoop library in:</p>
 
+<p>
 
+<span class="codefrag">$ build/native/&lt;platform&gt;/lib</span>
 
+</p>
 
+<p>where &lt;platform&gt; is combination of the system-properties: 
+      <span class="codefrag">${os.name}-${os.arch}-${sun.arch.data.model}</span>; for e.g. 
+      Linux-i386-32.</p>
 
+<a name="N10109"></a><a name="Notes"></a>
 
+<h3 class="h4">Notes</h3>
 
+<ul>
 
+          
+<li>
 
+            It is <strong>mandatory</strong> to have both the zlib and lzo 
+            development packages on the target platform for building the 
+            native hadoop library; however for deployment it is sufficient to 
+            install zlib or lzo if you wish to use only one of them.
 
+          </li>
 
+          
+<li>
 
+            It is necessary to have the correct 32/64 libraries of both zlib/lzo 
+            depending on the 32/64 bit jvm for the target platform for 
+            building/deployment of the native hadoop library.
 
+          </li>
 
+        
+</ul>
 
+</div>
 
+  
+</div>
 
+<!--+
 
+    |end content
 
+    +-->
 
+<div class="clearboth">&nbsp;</div>
 
+</div>
 
+<div id="footer">
 
+<!--+
 
+    |start bottomstrip
 
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+<script type="text/javascript"><!--
 
+document.write("Last Published: " + document.lastModified);
 
+//  --></script>
 
+</div>
 
+<div class="copyright">
 
+        Copyright &copy;
 
+         2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
 
+</div>
 
+<!--+
 
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+    +-->
 
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+</body>
 
+</html>

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@@ -1,9 +1,9 @@
 
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+    +-->
 
 <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>
 
+<!--+
 
+    |header
 
+    +-->
 
 <div class="header">
 
+<!--+
 
+    |start group logo
 
+    +-->
 
 <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>
 
+<!--+
 
+    |end group logo
 
+    +-->
 
+<!--+
 
+    |start Project Logo
 
+    +-->
 
 <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>
 
+<!--+
 
+    |end Project Logo
 
+    +-->
 
+<!--+
 
+    |start Search
 
+    +-->
 
 <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">
 
+                    <input name="Search" value="Search" type="submit">
 
 </form>
 
 </div>
 
+<!--+
 
+    |end search
 
+    +-->
 
+<!--+
 
+    |start Tabs
 
+    +-->
 
 <ul id="tabs">
 
 <li>
 
-<a class="base-not-selected" href="http://lucene.apache.org/hadoop/">Project</a>
 
+<a class="unselected" href="http://lucene.apache.org/hadoop/">Project</a>
 
 </li>
 
 <li>
 
-<a class="base-not-selected" href="http://wiki.apache.org/lucene-hadoop">Wiki</a>
 
+<a class="unselected" href="http://wiki.apache.org/lucene-hadoop">Wiki</a>
 
 </li>
 
 <li class="current">
 
-<a class="base-selected" href="index.html">Hadoop 0.16 Documentation</a>
 
+<a class="selected" href="index.html">Hadoop 0.16 Documentation</a>
 
 </li>
 
 </ul>
 
+<!--+
 
+    |end Tabs
 
+    +-->
 
 </div>
 
 </div>
 
 <div id="main">
 
 <div id="publishedStrip">
 
+<!--+
 
+    |start Subtabs
 
+    +-->
 
 <div id="level2tabs"></div>
 
+<!--+
 
+    |end Endtabs
 
+    +-->
 
 <script type="text/javascript"><!--
 
-document.write("<text>Last Published:</text> " + document.lastModified);
 
+document.write("Last Published: " + document.lastModified);
 
 //  --></script>
 
 </div>
 
+<!--+
 
+    |breadtrail
 
+    +-->
 
 <div class="breadtrail">
 
-             
+
 
              &nbsp;
 
            </div>
 
+<!--+
 
+    |start Menu, mainarea
 
+    +-->
 
+<!--+
 
+    |start Menu
 
+    +-->
 
 <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;">
 
@@ -75,6 +120,9 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <a href="mapred_tutorial.html">Map-Reduce Tutorial</a>
 
 </div>
 
 <div class="menuitem">
 
+<a href="native_libraries.html">Native Hadoop Libraries</a>
 
+</div>
 
+<div class="menuitem">
 
 <a href="streaming.html">Streaming</a>
 
 </div>
 
 <div class="menuitem">
 
@@ -96,8 +144,17 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <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>
 
+<!--+
 
+  |alternative credits
 
+  +-->
 
 <div id="credit2"></div>
 
 </div>
 
+<!--+
 
+    |end Menu
 
+    +-->
 
+<!--+
 
+    |start content
 
+    +-->
 
 <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>
 
@@ -469,18 +526,27 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
     
   
 </div>
 
+<!--+
 
+    |end content
 
+    +-->
 
 <div class="clearboth">&nbsp;</div>
 
 </div>
 
 <div id="footer">
 
+<!--+
 
+    |start bottomstrip
 
+    +-->
 
 <div class="lastmodified">
 
 <script type="text/javascript"><!--
 
-document.write("<text>Last Published:</text> " + document.lastModified);
 
+document.write("Last Published: " + document.lastModified);
 
 //  --></script>
 
 </div>
 
 <div class="copyright">
 
         Copyright &copy;
 
          2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
 
 </div>
 
+<!--+
 
+    |end bottomstrip
 
+    +-->
 
 </div>
 
 </body>
 
 </html>

+ 6 - 6
docs/skin/CommonMessages_de.xml
查看文件 

@@ -1,11 +1,11 @@
 
 <?xml version="1.0" encoding="ISO-8859-1"?>
 
 <!--
 
-  Copyright 1999-2004 The Apache Software Foundation or its licensors,
 
-  as applicable.
 
-
 
-  Licensed 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
 
+  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

+ 7 - 7
docs/skin/CommonMessages_en_US.xml
查看文件 

@@ -1,11 +1,11 @@
 
 <?xml version="1.0" encoding="ISO-8859-1"?>
 
 <!--
 
-  Copyright 1999-2004 The Apache Software Foundation or its licensors,
 
-  as applicable.
 
-
 
-  Licensed 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
 
+  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
 
 
@@ -19,5 +19,5 @@
 
   <message  key="Font size:">Font size:</message>
 
   <message key="Last Published:">Last Published:</message>
 
   <message key="Search">Search</message>
 
-  <message key="Search the site with">Search the site with</message>
 
+  <message key="Search the site with">Search site with</message>
 
 </catalogue>

+ 6 - 7
docs/skin/CommonMessages_es.xml
查看文件 

@@ -1,11 +1,11 @@
 
 <?xml version="1.0" encoding="ISO-8859-1"?>
 
 <!--
 
-  Copyright 1999-2004 The Apache Software Foundation or its licensors,
 
-  as applicable.
 
-
 
-  Licensed 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
 
+  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
 
 
@@ -21,4 +21,3 @@
 
   <message key="Search">Buscar</message>
 
   <message key="Search the site with">Buscar en</message>
 
 </catalogue>
 
-

+ 6 - 6
docs/skin/CommonMessages_fr.xml
查看文件 

@@ -1,11 +1,11 @@
 
 <?xml version="1.0" encoding="ISO-8859-1"?>
 
 <!--
 
-  Copyright 1999-2004 The Apache Software Foundation or its licensors,
 
-  as applicable.
 
-
 
-  Licensed 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
 
+  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

+ 33 - 14
docs/skin/basic.css
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2005 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *
 
@@ -38,34 +38,45 @@ img { border: 0; }
 
   clear: both;
 
 }
 
 
-.frame {
 
+.note, .warning, .fixme {
 
   border: solid black 1px;
 
   margin: 1em 3em;
 
 }
 
 
-.frame .label {
 
+.note .label {
 
   background: #369;
 
   color: white;
 
   font-weight: bold;
 
   padding: 5px 10px;
 
 }
 
-.frame .content {
 
-  padding: 5px 10px;
 
+.note .content {
 
   background: #F0F0FF;
 
   color: black;
 
   line-height: 120%;
 
   font-size: 90%;
 
+  padding: 5px 10px;
 
 }
 
 .warning .label {
 
   background: #C00;
 
   color: white;
 
+  font-weight: bold;
 
+  padding: 5px 10px;
 
 }
 
 .warning .content {
 
   background: #FFF0F0;
 
   color: black;
 
+  line-height: 120%;
 
+  font-size: 90%;
 
+  padding: 5px 10px;
 
 }
 
 .fixme .label {
 
   background: #C6C600;
 
+  color: black;
 
+  font-weight: bold;
 
+  padding: 5px 10px;
 
+}
 
+.fixme .content {
 
+  padding: 5px 10px;
 
 }
 
 
 /**
 
@@ -128,10 +139,18 @@ p {
 
 
 #content li,
 
 #content th,
 
-#content td {
 
-  line-height: 110%;  
-  margin-top: .1em;
 
-  margin-bottom: .1em;
 
+#content td,
 
+#content li ul,
 
+#content li ol{
 
+  margin-top: .5em;
 
+  margin-bottom: .5em;
 
+}
 
+
 
+
 
+#content li li,
 
+#minitoc-area li{
 
+  margin-top: 0em;
 
+  margin-bottom: 0em;
 
 }
 
 
 #content .attribution {

+ 6 - 6
docs/skin/breadcrumbs-optimized.js
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *

+ 6 - 6
docs/skin/breadcrumbs.js
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *

+ 6 - 6
docs/skin/fontsize.js
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *

+ 16 - 8
docs/skin/getBlank.js
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *
 
@@ -15,12 +15,14 @@
 
 * limitations under the License.
 
 */
 
 /**
 
- * This script, when included in a html file and called from a form text field, will set the value of this field to ""
 
+ * getBlank script - when included in a html file and called from a form text field, will set the value of this field to ""
 
  * if the text value is still the standard value.
 
+ * getPrompt script - when included in a html file and called from a form text field, will set the value of this field to the prompt
 
+ * if the text value is empty.
 
  *
 
  * Typical usage:
 
  * <script type="text/javascript" language="JavaScript" src="getBlank.js"></script>
 
- * <input type="text" id="query" value="Search the site:" onFocus="getBlank (this, 'Search the site:');"/>
 
+ * <input type="text" id="query" value="Search the site:" onFocus="getBlank (this, 'Search the site:');" onBlur="getBlank (this, 'Search the site:');"/>
 
  */
 
 <!--
 
 function getBlank (form, stdValue){
 
@@ -29,4 +31,10 @@ if (form.value == stdValue){
 
 	}
 
 return true;
 
 }
 
+function getPrompt (form, stdValue){
 
+if (form.value == ''){
 
+	form.value = stdValue;
 
+	}
 
+return true;
 
+}
 
 //-->

+ 6 - 6
docs/skin/getMenu.js
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *

二進制
docs/skin/images/chapter_open.gif
查看文件


二進制
docs/skin/images/rc-b-l-15-1body-2menu-3menu.png
查看文件


二進制
docs/skin/images/rc-b-r-15-1body-2menu-3menu.png
查看文件


二進制
docs/skin/images/rc-b-r-5-1header-2tab-selected-3tab-selected.png
查看文件


二進制
docs/skin/images/rc-t-l-5-1header-2searchbox-3searchbox.png
查看文件


二進制
docs/skin/images/rc-t-l-5-1header-2tab-selected-3tab-selected.png
查看文件


二進制
docs/skin/images/rc-t-l-5-1header-2tab-unselected-3tab-unselected.png
查看文件


二進制
docs/skin/images/rc-t-r-15-1body-2menu-3menu.png
查看文件


二進制
docs/skin/images/rc-t-r-5-1header-2searchbox-3searchbox.png
查看文件


二進制
docs/skin/images/rc-t-r-5-1header-2tab-selected-3tab-selected.png
查看文件


二進制
docs/skin/images/rc-t-r-5-1header-2tab-unselected-3tab-unselected.png
查看文件


+ 12 - 14
docs/skin/menu.js
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *
 
@@ -32,19 +32,17 @@ function SwitchMenu(obj)
 
     var title = document.getElementById(obj+'Title');
 
 
     if(obj.indexOf("_selected_")==0&&el.style.display == ""){
 
-      //nicolaken: doesn't work :-(
 
-      //title.style.backgroundImage = "url('images/chapter_open.gif')";
 
       el.style.display = "block";
 
+      title.className = "pagegroupselected";
 
     }
 
 
-    if(el.style.display != "block"){ 
-      //nicolaken: doesn't work :-(
 
-      //title.style.backgroundImage = 'url([url]images/chapter_open.gif[/url])';
 
+    if(el.style.display != "block"){
 
       el.style.display = "block";
 
-    }else{
 
-      //nicolaken: doesn't work :-(
 
-      //title.style.backgroundImage = "url('images/chapter.gif')";
 
+      title.className = "pagegroupopen";
 
+    }
 
+    else{
 
       el.style.display = "none";
 
+      title.className = "pagegroup";
 
     }
 
   }// end -  if(document.getElementById) 
 }//end - function SwitchMenu(obj)

+ 8 - 8
docs/skin/print.css
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *
 
@@ -31,12 +31,12 @@ body {
 
   padding: 0;
 
   float: none !important;
 
   color: black;
 
-  background: transparent;
 
+  background: inherit;
 
 }
 
 
 a:link, a:visited {
 
   color: #336699;
 
-  background: transparent;
 
+  background: inherit;
 
   text-decoration: underline;
 
 }

+ 10 - 5
docs/skin/profile.css
查看文件 

@@ -46,11 +46,16 @@ a.external  {
 
 #tabs li a:visited { color: #000000; }
 
 #tabs li a:hover { color: #000000; }
 
 
-#level2tabs       { background-color: #4C6C8F ;} 
+#level2tabs a.selected      { background-color: #4C6C8F ;} 
 #level2tabs a:link {  color: #ffffff;  }
 
 #level2tabs a:visited { color: #ffffff; }
 
 #level2tabs a:hover { color: #ffffff; }
 
 
+#level2tabs { background-color: #E5E4D9;}
 
+#level2tabs a.unselected:link {  color: #000000;  }
 
+#level2tabs a.unselected:visited { color: #000000; }
 
+#level2tabs a.unselected:hover { color: #000000; }
 
+
 
 .heading { background-color: #E5E4D9;} 
 
 .boxed { background-color: #E5E4D9;} 
@@ -80,7 +85,8 @@ color: #000000;
 
 background: #E5E4D9; 
 }
 
 
-#menu .menupagetitle  { background-color: #CFDCED}
 
+#menu .menupagetitle  { background-color: #CFDCED;
 
+  color: #000000;}
 
 
 #menu           { border-color: #999999;}
 
 #menu .menupagetitle  { border-color: #999999;}
 
@@ -104,7 +110,6 @@ background-color: #E5E4D9 ;
 
 color: #000000; 
 } 
  
-#menu .menupagetitle  { color: #000000;}    
 #menu .menupageitemgroup     { 
 background-color: #E5E4D9;
 
 }
 
@@ -123,8 +128,8 @@ background-color: #ffffff;
 
 color: #000000;
 
 } 
 a:link { color:#0000ff} 
-a:visited { color:#0000ff} 
-a:hover { color:#0000ff} 
+a:visited { color:#009999} 
+a:hover { color:#6587ff} 
 
  
 .ForrestTable      { background-color: #ccc;}

+ 56 - 19
docs/skin/screen.css
查看文件 

@@ -1,10 +1,10 @@
 
 /*
 
-* Copyright 2002-2004 The Apache Software Foundation or its licensors,
 
-* as applicable.
 
-*
 
-* Licensed 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
 
+* 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
 
 *
 
@@ -17,7 +17,7 @@
 
 body {  margin: 0px 0px 0px 0px; font-family: Verdana, Helvetica, sans-serif; }
 
 
 h1     { font-size : 160%; margin: 0px 0px 0px 0px;  padding: 0px; }
 
-h2     { font-size : 140%; margin: 0.9em 0px 0px 0px; padding: 0px; font-weight : bold;}
 
+h2     { font-size : 140%; margin: 1em 0px 0.8em 0px; padding: 0px; font-weight : bold;}
 
 h3     { font-size : 130%; margin: 0.8em 0px 0px 0px; padding: 0px; font-weight : bold; }
 
 .h3 { margin: 22px 0px 3px 0px; }
 
 h4     { font-size : 120%; margin: 0.7em 0px 0px 0px; padding: 0px; font-weight : normal; text-align: left; }
 
@@ -152,6 +152,12 @@ html>body #top .searchbox {
 
     width: .1em; /* IE/Win fix */
 
 }
 
 
+#tabs li a:hover {
 
+   
+    cursor: pointer;
 
+    text-decoration:underline;
 
+}
 
+
 
 #tabs > li a { width: auto; } /* Rest of IE/Win fix */
 
 
 /* Commented Backslash Hack hides rule from IE5-Mac \*/
 
@@ -188,6 +194,27 @@ html>body #top .searchbox {
 
 margin: 0;
 
 float:left;
 
 position:relative;
 
+
 
+}
 
+
 
+
 
+
 
+#level2tabs  a:hover {
 
+   
+    cursor: pointer;
 
+    text-decoration:underline;
 
+    
+}
 
+
 
+#level2tabs  a{
 
+   
+    cursor: pointer;
 
+    text-decoration:none;
 
+    background-image: url('images/chapter.gif');
 
+    background-repeat: no-repeat;
 
+    background-position: center left;
 
+    padding-left: 6px;
 
+    margin-left: 6px;
 
 }
 
 
 /*
 
@@ -252,10 +279,10 @@ img.cornersmall {
 
 /**
 
  * Side menu
 
  */
 
-#menu a {  font-weight: normal;}
 
+#menu a {  font-weight: normal; text-decoration: none;}
 
 #menu a:visited {  font-weight: normal; }
 
 #menu a:active {  font-weight: normal; }
 
-#menu a:hover {  font-weight: normal; }
 
+#menu a:hover {  font-weight: normal;  text-decoration:underline;}
 
 
 #menuarea { width:10em;}
 
 #menu {
 
@@ -268,6 +295,7 @@ img.cornersmall {
 
     z-index: 20;
 
     background-color: #f90;
 
     font-size : 70%;
 
+    
 }
 
 
 .menutitle {
 
@@ -278,20 +306,26 @@ img.cornersmall {
 
         background-repeat: no-repeat;
 
         background-position: center left;
 
         font-weight : bold;
 
+
 
+        
 }
 
 
+.menutitle:hover{text-decoration:underline;cursor: pointer;}
 
+
 
 #menu .menuitemgroup {
 
         margin: 0px 0px 6px 8px;
 
         padding: 0px;
 
         font-weight : bold; }
 
 
 #menu .selectedmenuitemgroup{
 
-        margin: 0px 0px 6px 8px;
 
+        margin: 0px 0px 0px 8px;
 
         padding: 0px;
 
-        font-weight : bold; }
 
+        font-weight : normal; 
+       
+        }
 
 
 #menu .menuitem {
 
-        padding: 0px 0px 2px 12px;
 
+        padding: 2px 0px 1px 13px;
 
         background-image: url('images/page.gif');
 
         background-repeat: no-repeat;
 
         background-position: center left;
 
@@ -300,19 +334,20 @@ img.cornersmall {
 
 }
 
 
 #menu .menupage {
 
-        margin: 5px 0px 5px 10px;
 
+        margin: 2px 0px 1px 10px;
 
         padding: 0px 3px 0px 12px;
 
-        background-image: url('images/current.gif');
 
+        background-image: url('images/page.gif');
 
         background-repeat: no-repeat;
 
-        background-position: top left;
 
+        background-position: center left;
 
         font-style : normal;
 
 }
 
 #menu .menupagetitle {
 
-        padding: 0px 0px 0px 6px;
 
+        padding: 0px 0px 0px 1px;
 
         font-style : normal;
 
         border-style: solid;
 
         border-width: 1px;
 
         margin-right: 10px;
 
+         
 }
 
 #menu .menupageitemgroup {
 
         padding: 3px 0px 4px 6px;
 
@@ -436,10 +471,11 @@ acronym { cursor: help; }
 
 #minitoc-area {
 
     border-top: solid 1px #4C6C8F;
 
     border-bottom: solid 1px #4C6C8F;
 
-    margin-bottom: 15px;
 
+    margin: 15px 10% 5px 15px;
 
+   /* margin-bottom: 15px;
 
     margin-left: 15px;
 
-    margin-right: 10%;
 
-    padding-bottom: 5px;
 
+    margin-right: 10%;*/
 
+    padding-bottom: 7px;
 
     padding-top: 5px;
 
 }
 
 .minitoc {
 
@@ -523,6 +559,7 @@ li p {
 
 }
 
 
 .printlink {
 
+    position: relative; /* IE bugfix cont'd */
 
     float: right;
 
 }
 
 .printlink br {

+ 75 - 9
docs/streaming.html
查看文件 

@@ -1,9 +1,9 @@
 
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 
+<!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-version" content="0.8">
 
 <meta name="Forrest-skin-name" content="pelt">
 
 <meta name="http-equiv" content="Content-Type">
 
 <meta name="content" content="text/html;">
 
@@ -19,46 +19,91 @@
 
 <body onload="init()">
 
 <script type="text/javascript">ndeSetTextSize();</script>
 
 <div id="top">
 
+<!--+
 
+    |breadtrail
 
+    +-->
 
 <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>
 
+<!--+
 
+    |header
 
+    +-->
 
 <div class="header">
 
+<!--+
 
+    |start group logo
 
+    +-->
 
 <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>
 
+<!--+
 
+    |end group logo
 
+    +-->
 
+<!--+
 
+    |start Project Logo
 
+    +-->
 
 <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>
 
+<!--+
 
+    |end Project Logo
 
+    +-->
 
+<!--+
 
+    |start Search
 
+    +-->
 
 <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">
 
+                    <input name="Search" value="Search" type="submit">
 
 </form>
 
 </div>
 
+<!--+
 
+    |end search
 
+    +-->
 
+<!--+
 
+    |start Tabs
 
+    +-->
 
 <ul id="tabs">
 
 <li>
 
-<a class="base-not-selected" href="http://lucene.apache.org/hadoop/">Project</a>
 
+<a class="unselected" href="http://lucene.apache.org/hadoop/">Project</a>
 
 </li>
 
 <li>
 
-<a class="base-not-selected" href="http://wiki.apache.org/lucene-hadoop">Wiki</a>
 
+<a class="unselected" href="http://wiki.apache.org/lucene-hadoop">Wiki</a>
 
 </li>
 
 <li class="current">
 
-<a class="base-selected" href="index.html">Hadoop 0.16 Documentation</a>
 
+<a class="selected" href="index.html">Hadoop 0.16 Documentation</a>
 
 </li>
 
 </ul>
 
+<!--+
 
+    |end Tabs
 
+    +-->
 
 </div>
 
 </div>
 
 <div id="main">
 
 <div id="publishedStrip">
 
+<!--+
 
+    |start Subtabs
 
+    +-->
 
 <div id="level2tabs"></div>
 
+<!--+
 
+    |end Endtabs
 
+    +-->
 
 <script type="text/javascript"><!--
 
-document.write("<text>Last Published:</text> " + document.lastModified);
 
+document.write("Last Published: " + document.lastModified);
 
 //  --></script>
 
 </div>
 
+<!--+
 
+    |breadtrail
 
+    +-->
 
 <div class="breadtrail">
 
-             
+
 
              &nbsp;
 
            </div>
 
+<!--+
 
+    |start Menu, mainarea
 
+    +-->
 
+<!--+
 
+    |start Menu
 
+    +-->
 
 <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;">
 
@@ -77,6 +122,9 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <div class="menuitem">
 
 <a href="mapred_tutorial.html">Map-Reduce Tutorial</a>
 
 </div>
 
+<div class="menuitem">
 
+<a href="native_libraries.html">Native Hadoop Libraries</a>
 
+</div>
 
 <div class="menupage">
 
 <div class="menupagetitle">Streaming</div>
 
 </div>
 
@@ -99,8 +147,17 @@ document.write("<text>Last Published:</text> " + document.lastModified);
 
 <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>
 
+<!--+
 
+  |alternative credits
 
+  +-->
 
 <div id="credit2"></div>
 
 </div>
 
+<!--+
 
+    |end Menu
 
+    +-->
 
+<!--+
 
+    |start content
 
+    +-->
 
 <div id="content">
 
 <div title="Portable Document Format" class="pdflink">
 
 <a class="dida" href="streaming.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
 
@@ -754,18 +811,27 @@ Anything found between BEGIN_STRING and END_STRING would be treated as one recor
 
 </div>
 
 
 </div>
 
+<!--+
 
+    |end content
 
+    +-->
 
 <div class="clearboth">&nbsp;</div>
 
 </div>
 
 <div id="footer">
 
+<!--+
 
+    |start bottomstrip
 
+    +-->
 
 <div class="lastmodified">
 
 <script type="text/javascript"><!--
 
-document.write("<text>Last Published:</text> " + document.lastModified);
 
+document.write("Last Published: " + document.lastModified);
 
 //  --></script>
 
 </div>
 
 <div class="copyright">
 
         Copyright &copy;
 
          2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
 
 </div>
 
+<!--+
 
+    |end bottomstrip
 
+    +-->
 
 </div>
 
 </body>
 
 </html>

+ 1 - 0
src/docs/src/documentation/content/xdocs/index.xml
查看文件 

@@ -19,6 +19,7 @@
 
       <li><a href="cluster_setup.html">Hadoop Cluster Setup</a></li>
 
       <li><a href="hdfs_design.html">Hadoop Distributed File System</a></li>
 
       <li><a href="mapred_tutorial.html">Hadoop Map-Reduce Tutorial</a></li>
 
+      <li><a href="native_libraries.html">Native Hadoop Libraries</a></li>
 
       <li><a href="ext:api/index">API Docs</a></li>
 
       <li><a href="ext:wiki">Wiki</a></li>
 
       <li><a href="ext:faq">FAQ</a></li>

+ 72 - 2
src/docs/src/documentation/content/xdocs/mapred_tutorial.xml
查看文件 

@@ -1109,8 +1109,14 @@
 
         individual task.</p>
 
 
         <p><a href="ext:api/org/apache/hadoop/mapred/textinputformat">
 
-        TextInputFormat</a> is the default <code>InputFormat</code>.
 
-        </p>
 
+        TextInputFormat</a> is the default <code>InputFormat</code>.</p>
 
+        
+        <p>If <code>TextInputFormat</code> is the <code>InputFormat</code> for a 
+        given job, the framework detects input-files with the <em>.gz</em> and 
+        <em>.lzo</em> extensions and automatically decompresses them using the 
+        appropriate <code>CompressionCodec</code>. However, it must be noted that
 
+        compressed files with the above extensions cannot be <em>split</em> and 
+        each compressed file is processed in its entirety by a single mapper.</p>
 
         
         <section>
 
           <title>InputSplit</title>
 
@@ -1336,6 +1342,70 @@
 
           JobControl</a> is a utility which encapsulates a set of Map-Reduce jobs
 
           and their dependencies.</p>
 
         </section>
 
+        
+        <section>
 
+          <title>Data Compression</title>
 
+          
+          <p>Hadoop Map-Reduce provides facilities for the application-writer to
 
+          specify compression for both intermediate map-outputs and the
 
+          job-outputs i.e. output of the reduces. It also comes bundled with
 
+          <a href="ext:api/org/apache/hadoop/io/compress/compressioncodec">
 
+          CompressionCodec</a> implementations for the 
+          <a href="ext:zlib">zlib</a> and <a href="ext:lzo">lzo</a> compression 
+          algorithms. The <a href="ext:gzip">gzip</a> file format is also
 
+          supported.</p>
 
+          
+          <p>Hadoop also provides native implementations of the above compression
 
+          codecs for reasons of both performance (zlib) and non-availability of
 
+          Java libraries (lzo). More details on their usage and availability are
 
+          available <a href="native_libraries.html">here</a>.</p>
 
+          
+          <section>
 
+            <title>Intermediate Outputs</title>
 
+            
+            <p>Applications can control compression of intermediate map-outputs
 
+            via the 
+            <a href="ext:api/org/apache/hadoop/mapred/jobconf/setcompressmapoutput">
 
+            JobConf.setCompressMapOutput(boolean)</a> api and the 
+            <code>CompressionCodec</code> to be used via the
 
+            <a href="ext:api/org/apache/hadoop/mapred/jobconf/setmapoutputcompressorclass">
 
+            JobConf.setMapOutputCompressorClass(Class)</a> api. Since 
+            the intermediate map-outputs are always stored in the 
+            <a href="ext:api/org/apache/hadoop/io/sequencefile">SequenceFile</a>
 
+            format, the
 
+            <a href="ext:api/org/apache/hadoop/io/sequencefilecompressiontype">
 
+            SequenceFile.CompressionType</a> (i.e.
 
+            <a href="ext:api/org/apache/hadoop/io/sequencefilecompressiontype/record">
 
+            RECORD</a> / 
+            <a href="ext:api/org/apache/hadoop/io/sequencefilecompressiontype/block">
 
+            BLOCK</a> - defaults to <code>RECORD</code>) can be specified via the
 
+            <a href="ext:api/org/apache/hadoop/mapred/jobconf/setmapoutputcompressiontype">
 
+            JobConf.setMapOutputCompressionType(SequenceFile.CompressionType)</a> 
+            api.</p>
 
+          </section>
 
+          
+          <section>
 
+            <title>Job Outputs</title>
 
+            
+            <p>Applications can control compression of job-outputs via the
 
+            <a href="ext:api/org/apache/hadoop/mapred/outputformatbase/setcompressoutput">
 
+            OutputFormatBase.setCompressOutput(JobConf, boolean)</a> api and the 
+            <code>CompressionCodec</code> to be used can be specified via the
 
+            <a href="ext:api/org/apache/hadoop/mapred/outputformatbase/setoutputcompressorclass">
 
+            OutputFormatBase.setOutputCompressorClass(JobConf, Class)</a> api.</p>
 
+            
+            <p>If the job outputs are to be stored in the 
+            <a href="ext:api/org/apache/hadoop/mapred/sequencefileoutputformat">
 
+            SequenceFileOutputFormat</a>, the required
 
+            <code>SequenceFile.CompressionType</code> (i.e. <code>RECORD</code> / 
+            <code>BLOCK</code> - defaults to <code>RECORD</code>)can be specified 
+            via the 
+            <a href="ext:api/org/apache/hadoop/mapred/sequencefileoutputformat/setoutputcompressiontype">
 
+            SequenceFileOutputFormat.setOutputCompressionType(JobConf, 
+            SequenceFile.CompressionType)</a> api.</p>
 
+          </section>
 
+        </section>
 
+        
       </section>
 
     </section>

+ 175 - 0
src/docs/src/documentation/content/xdocs/native_libraries.xml
查看文件 

@@ -0,0 +1,175 @@
 
+<?xml version="1.0"?>
 
+
 
+<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V2.0//EN" "http://forrest.apache.org/dtd/document-v20.dtd">
 
+
 
+<document>
 
+  
+  <header>
 
+    <title>Native Hadoop Libraries</title>
 
+  </header>
 
+  
+  <body>
 
+  
+    <section>
 
+      <title>Purpose</title>
 
+      
+      <p>Hadoop has native implementations of certain components for reasons of 
+      both performace &amp; non-availability of Java implementations. These 
+      components are available in a single, dynamically-linked, native library. 
+      On the *nix platform it is <em>libhadoop.so</em>. This document describes 
+      the usage &amp; details on how to build the native libraries.</p>
 
+    </section>
 
+    
+    <section>
 
+      <title>Components</title>
 
+      
+      <p>Hadoop currently has the following 
+      <a href="ext:api/org/apache/hadoop/io/compress/compressioncodec">
 
+      compression codecs</a> as the native components:</p>
 
+      <ul>
 
+        <li><a href="ext:zlib">zlib</a></li>
 
+        <li><a href="ext:gzip">gzip</a></li>
 
+        <li><a href="ext:lzo">lzo</a></li>
 
+      </ul>
 
+      
+      <p>Of the above, the availability of native hadoop libraries is imperative 
+      for the lzo and gzip compression codecs to work.</p>
 
+    </section>
 
+
 
+    <section>
 
+      <title>Usage</title>
 
+      
+      <p>It is fairly simple to use the native hadoop libraries:</p>
 
+
 
+      <ul>
 
+        <li>
 
+          Take a look at the 
+          <a href="#Supported+Platforms">supported platforms</a>.
 
+        </li>
 
+        <li>
 
+          Either <a href="ext:releases/download">download</a> the pre-built 
+          32-bit i386-Linux native hadoop libraries (available as part of hadoop 
+          distribution in <code>lib/native</code> directory) or 
+          <a href="#Building+Native+Hadoop+Libraries">build</a> them yourself.
 
+        </li>
 
+        <li>
 
+          Ensure you have either or both of <strong>&gt;zlib-1.2</strong> and 
+          <strong>&gt;lzo2.0</strong> packages for your platform installed; 
+          depending on your needs.
 
+        </li>
 
+      </ul>
 
+      
+      <p>The <code>bin/hadoop</code> script ensures that the native hadoop 
+      library is on the library path via the system property 
+      <em>-Djava.library.path=&lt;path&gt;</em>.</p>
 
+
 
+      <p>To check everything went alright check the hadoop log files for:</p>
 
+      
+      <p>
 
+        <code>
 
+          DEBUG util.NativeCodeLoader - Trying to load the custom-built 
+          native-hadoop library... 
+        </code><br/>
 
+        <code>
 
+          INFO  util.NativeCodeLoader - Loaded the native-hadoop library
 
+        </code>
 
+      </p>
 
+
 
+      <p>If something goes wrong, then:</p>
 
+      <p>
 
+        <code>
 
+          INFO util.NativeCodeLoader - Unable to load native-hadoop library for 
+          your platform... using builtin-java classes where applicable
 
+        </code>
 
+      </p>
 
+    </section>
 
+    
+    <section>
 
+      <title>Supported Platforms</title>
 
+      
+      <p>Hadoop native library is supported only on *nix platforms only.
 
+      Unfortunately it is known not to work on <a href="ext:cygwin">Cygwin</a> 
+      and <a href="ext:osx">Mac OS X</a> and has mainly been used on the 
+      GNU/Linux platform.</p>
 
+
 
+      <p>It has been tested on the following GNU/Linux distributions:</p>
 
+      <ul>
 
+        <li>
 
+          <a href="http://www.redhat.com/rhel/">RHEL4</a>/<a href="http://fedora.redhat.com/">Fedora</a>
 
+        </li>
 
+        <li><a href="http://www.ubuntu.com/">Ubuntu</a></li>
 
+        <li><a href="http://www.gentoo.org/">Gentoo</a></li>
 
+      </ul>
 
+
 
+      <p>On all the above platforms a 32/64 bit Hadoop native library will work 
+      with a respective 32/64 bit jvm.</p>
 
+    </section>
 
+    
+    <section>
 
+      <title>Building Native Hadoop Libraries</title>
 
+      
+      <p>Hadoop native library is written in 
+      <a href="http://en.wikipedia.org/wiki/ANSI_C">ANSI C</a> and built using 
+      the GNU autotools-chain (autoconf, autoheader, automake, autoscan, libtool). 
+      This means it should be straight-forward to build them on any platform with 
+      a standards compliant C compiler and the GNU autotools-chain. 
+      See <a href="#Supported+Platforms">supported platforms</a>.</p>
 
+
 
+      <p>In particular the various packages you would need on the target 
+      platform are:</p>
 
+      <ul>
 
+        <li>
 
+          C compiler (e.g. <a href="http://gcc.gnu.org/">GNU C Compiler</a>)
 
+        </li>
 
+        <li>
 
+          GNU Autools Chain: 
+          <a href="http://www.gnu.org/software/autoconf/">autoconf</a>, 
+          <a href="http://www.gnu.org/software/automake/">automake</a>, 
+          <a href="http://www.gnu.org/software/libtool/">libtool</a>
 
+        </li>
 
+        <li> 
+          zlib-development package (stable version >= 1.2.0)
 
+        </li>
 
+        <li> 
+          lzo-development package (stable version >= 2.0)
 
+        </li> 
+      </ul>
 
+
 
+      <p>Once you have the pre-requisites use the standard <code>build.xml</code> 
+      and pass along the <code>compile.native</code> flag (set to 
+      <code>true</code>) to build the native hadoop library:</p>
 
+
 
+      <p><code>$ ant -Dcompile.native=true &lt;target&gt;</code></p>
 
+
 
+      <p>The native hadoop library is not built by default since not everyone is 
+      interested in building them.</p>
 
+
 
+      <p>You should see the newly-built native hadoop library in:</p>
 
+
 
+      <p><code>$ build/native/&lt;platform&gt;/lib</code></p>
 
+
 
+      <p>where &lt;platform&gt; is combination of the system-properties: 
+      <code>${os.name}-${os.arch}-${sun.arch.data.model}</code>; for e.g. 
+      Linux-i386-32.</p>
 
+
 
+      <section>
 
+        <title>Notes</title>
 
+        
+        <ul>
 
+          <li>
 
+            It is <strong>mandatory</strong> to have both the zlib and lzo 
+            development packages on the target platform for building the 
+            native hadoop library; however for deployment it is sufficient to 
+            install zlib or lzo if you wish to use only one of them.
 
+          </li>
 
+          <li>
 
+            It is necessary to have the correct 32/64 libraries of both zlib/lzo 
+            depending on the 32/64 bit jvm for the target platform for 
+            building/deployment of the native hadoop library.
 
+          </li>
 
+        </ul>
 
+      </section>
 
+    </section>
 
+  </body>
 
+  
+</document>

+ 24 - 1
src/docs/src/documentation/content/xdocs/site.xml
查看文件 

@@ -22,6 +22,7 @@ See http://forrest.apache.org/docs/linking.html for more info.
 
     <setup     label="Cluster Setup"      href="cluster_setup.html" />
 
     <hdfs      label="HDFS Architecture"  href="hdfs_design.html" />
 
     <mapred    label="Map-Reduce Tutorial" href="mapred_tutorial.html" />
 
+    <mapred    label="Native Hadoop Libraries" href="native_libraries.html" />
 
     <streaming label="Streaming"          href="streaming.html" />
 
     <hod       label="Hadoop On Demand"   href="hod.html" />
 
     <api       label="API Docs"           href="ext:api/index" />
 
@@ -33,13 +34,20 @@ See http://forrest.apache.org/docs/linking.html for more info.
 
   <external-refs>
 
     <site      href="http://lucene.apache.org/hadoop/"/>
 
     <lists     href="http://lucene.apache.org/hadoop/mailing_lists.html"/>
 
-    <releases  href="http://lucene.apache.org/hadoop/releases.html"/>
 
+    <releases  href="http://lucene.apache.org/hadoop/releases.html">
 
+      <download href="#Download" />
 
+    </releases>
 
     <jira      href="http://lucene.apache.org/hadoop/issue_tracking.html"/>
 
     <wiki      href="http://wiki.apache.org/lucene-hadoop/" />
 
     <faq       href="http://wiki.apache.org/lucene-hadoop/FAQ" />
 
     <lucene    href="http://lucene.apache.org/" />
 
     <nutch     href="http://lucene.apache.org/nutch/" />
 
     <hadoop-default href="http://lucene.apache.org/hadoop/hadoop-default.html" />
 
+    <zlib      href="http://www.zlib.net/" />
 
+    <lzo       href="http://www.oberhumer.com/opensource/lzo/" />
 
+    <gzip      href="http://www.gzip.org/" />
 
+    <cygwin    href="http://www.cygwin.com/" />
 
+    <osx       href="http://www.apple.com/macosx" />
 
     <api href="api/">
 
       <index href="index.html" />
 
       <org href="org/">
 
@@ -63,6 +71,11 @@ See http://forrest.apache.org/docs/linking.html for more info.
 
                 <close href="#close()" />
 
               </closeable>
 
               <sequencefile href="SequenceFile.html" />
 
+              <sequencefilecompressiontype href="SequenceFile.CompressionType.html">
 
+                <none href="#NONE" />
 
+                <record href="#RECORD" />
 
+                <block href="#BLOCK" />
 
+              </sequencefilecompressiontype>
 
               <writable href="Writable.html" />
 
               <writablecomparable href="WritableComparable.html" />
 
               <compress href="compress/">
 
@@ -99,6 +112,9 @@ See http://forrest.apache.org/docs/linking.html for more info.
 
                 <setmaxmaptaskfailurespercent href="#setMaxMapTaskFailuresPercent(int)" />
 
                 <setmaxreducetaskfailurespercent href="#setMaxReduceTaskFailuresPercent(int)" />
 
                 <setjobendnotificationuri href="#setJobEndNotificationURI(java.lang.String)" />
 
+                <setcompressmapoutput href="#setCompressMapOutput(boolean)" />
 
+                <setmapoutputcompressiontype href="#setMapOutputCompressionType(org.apache.hadoop.io.SequenceFile.CompressionType)" />
 
+                <setmapoutputcompressorclass href="#setMapOutputCompressorClass(java.lang.Class)" />
 
               </jobconf>
 
               <jobconfigurable href="JobConfigurable.html">
 
                 <configure href="#configure(org.apache.hadoop.mapred.JobConf)" />
 
@@ -113,6 +129,13 @@ See http://forrest.apache.org/docs/linking.html for more info.
 
                 <collect href="#collect(K, V)" />
 
               </outputcollector>
 
               <outputformat href="OutputFormat.html" />
 
+              <outputformatbase href="OutputFormatBase.html">
 
+                <setcompressoutput href="#setCompressOutput(org.apache.hadoop.mapred.JobConf,%20boolean)" />
 
+                <setoutputcompressorclass href="#setOutputCompressorClass(org.apache.hadoop.mapred.JobConf,%20java.lang.Class)" />
 
+              </outputformatbase>
 
+              <sequencefileoutputformat href="SequenceFileOutputFormat.html">
 
+                <setoutputcompressiontype href="#setOutputCompressionType(org.apache.hadoop.mapred.JobConf,%20org.apache.hadoop.io.SequenceFile.CompressionType)" />
 
+              </sequencefileoutputformat>
 
               <partitioner href="Partitioner.html" />
 
               <recordreader href="RecordReader.html" />
 
               <recordwriter href="RecordWriter.html" />

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