svn commit: r668617 [1/3] - in /hadoop/core/branches/branch-0.18: ./ docs/ src/docs/src/documentation/content/xdocs/

[dd...@apache.org]

Author: ddas
Date: Tue Jun 17 04:09:39 2008
New Revision: 668617

URL: http://svn.apache.org/viewvc?rev=668617&view=rev
Log:
Merge -r 668611:668612 from trunk onto 0.18 branch. Fixes HADOOP-2762.

Modified:
    hadoop/core/branches/branch-0.18/CHANGES.txt
    hadoop/core/branches/branch-0.18/docs/cluster_setup.html
    hadoop/core/branches/branch-0.18/docs/cluster_setup.pdf
    hadoop/core/branches/branch-0.18/docs/mapred_tutorial.html
    hadoop/core/branches/branch-0.18/docs/mapred_tutorial.pdf
    hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/cluster_setup.xml
    hadoop/core/branches/branch-0.18/src/docs/src/documentation/content/xdocs/mapred_tutorial.xml

Modified: hadoop/core/branches/branch-0.18/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/CHANGES.txt?rev=668617&r1=668616&r2=668617&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/CHANGES.txt (original)
+++ hadoop/core/branches/branch-0.18/CHANGES.txt Tue Jun 17 04:09:39 2008
@@ -290,6 +290,9 @@
     HADOOP-3406. Add forrest documentation for Profiling.
     (Amareshwari Sriramadasu via ddas)
 
+    HADOOP-2762. Add forrest documentation for controls of memory limits on 
+    hadoop daemons and Map-Reduce tasks. (Amareshwari Sriramadasu via ddas)
+
   OPTIMIZATIONS
 
     HADOOP-3274. The default constructor of BytesWritable creates empty 

Modified: hadoop/core/branches/branch-0.18/docs/cluster_setup.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/docs/cluster_setup.html?rev=668617&r1=668616&r2=668617&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/docs/cluster_setup.html (original)
+++ hadoop/core/branches/branch-0.18/docs/cluster_setup.html Tue Jun 17 04:09:39 2008
@@ -324,6 +324,45 @@
 <p>At the very least you should specify the
           <span class="codefrag">JAVA_HOME</span> so that it is correctly defined on each
           remote node.</p>
+<p>Administrators can configure individual daemons using the
+          configuration options <span class="codefrag">HADOOP_*_OPTS</span>. Various options 
+          available are shown below in the table. </p>
+<table class="ForrestTable" cellspacing="1" cellpadding="4">
+          
+<tr>
+<th colspan="1" rowspan="1">Daemon</th><th colspan="1" rowspan="1">Configure Options</th>
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">NameNode</td><td colspan="1" rowspan="1">HADOOP_NAMENODE_OPTS</td>
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">DataNode</td><td colspan="1" rowspan="1">HADOOP_DATANODE_OPTS</td>
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">SecondaryNamenode</td>
+              <td colspan="1" rowspan="1">HADOOP_SECONDARYNAMENODE_OPTS</td>
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">JobTracker</td><td colspan="1" rowspan="1">HADOOP_JOBTRACKER_OPTS</td>
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">TaskTracker</td><td colspan="1" rowspan="1">HADOOP_TASKTRACKER_OPTS</td>
+</tr>
+          
+</table>
+<p> For example, To configure Namenode to use parallelGC, the
+          following statement should be added in <span class="codefrag">hadoop-env.sh</span> :
+          <br>
+<span class="codefrag">
+          export HADOOP_NAMENODE_OPTS="-XX:+UseParallelGC ${HADOOP_NAMENODE_OPTS}"
+          </span>
+<br>
+</p>
 <p>Other useful configuration parameters that you can customize 
           include:</p>
 <ul>
@@ -338,11 +377,13 @@
 <li>
               
 <span class="codefrag">HADOOP_HEAPSIZE</span> - The maximum amount of heapsize 
-              to use, in MB e.g. <span class="codefrag">2000MB</span>.
+              to use, in MB e.g. <span class="codefrag">1000MB</span>. This is used to 
+              configure the heap size for the hadoop daemon. By default,
+              the value is <span class="codefrag">1000MB</span>.
             </li>
           
 </ul>
-<a name="N100DD"></a><a name="Configuring+the+Hadoop+Daemons"></a>
+<a name="N10130"></a><a name="Configuring+the+Hadoop+Daemons"></a>
 <h4>Configuring the Hadoop Daemons</h4>
 <p>This section deals with important parameters to be specified in the
           <span class="codefrag">conf/hadoop-site.xml</span> for the Hadoop cluster.</p>
@@ -466,7 +507,7 @@
           <a href="api/org/apache/hadoop/conf/Configuration.html#FinalParams">
           final</a> to ensure that they cannot be overriden by user-applications.
           </p>
-<a name="N101BC"></a><a name="Real-World+Cluster+Configurations"></a>
+<a name="N1020F"></a><a name="Real-World+Cluster+Configurations"></a>
 <h5>Real-World Cluster Configurations</h5>
 <p>This section lists some non-default configuration parameters which 
             have been used to run the <em>sort</em> benchmark on very large 
@@ -618,7 +659,7 @@
                     
 <td colspan="1" rowspan="1">mapred.child.java.opts</td>
                     <td colspan="1" rowspan="1">-Xmx1024M</td>
-                    <td colspan="1" rowspan="1"></td>
+                    <td colspan="1" rowspan="1">Larger heap-size for child jvms of maps/reduces.</td>
                   
 </tr>
                 
@@ -627,7 +668,7 @@
 </li>
             
 </ul>
-<a name="N102D9"></a><a name="Slaves"></a>
+<a name="N1032D"></a><a name="Slaves"></a>
 <h4>Slaves</h4>
 <p>Typically you choose one machine in the cluster to act as the 
           <span class="codefrag">NameNode</span> and one machine as to act as the 
@@ -636,14 +677,14 @@
           referred to as <em>slaves</em>.</p>
 <p>List all slave hostnames or IP addresses in your 
           <span class="codefrag">conf/slaves</span> file, one per line.</p>
-<a name="N102F8"></a><a name="Logging"></a>
+<a name="N1034C"></a><a name="Logging"></a>
 <h4>Logging</h4>
 <p>Hadoop uses the <a href="http://logging.apache.org/log4j/">Apache 
           log4j</a> via the <a href="http://commons.apache.org/logging/">Apache 
           Commons Logging</a> framework for logging. Edit the 
           <span class="codefrag">conf/log4j.properties</span> file to customize the Hadoop 
           daemons' logging configuration (log-formats and so on).</p>
-<a name="N1030C"></a><a name="History+Logging"></a>
+<a name="N10360"></a><a name="History+Logging"></a>
 <h5>History Logging</h5>
 <p> The job history files are stored in central location 
             <span class="codefrag"> hadoop.job.history.location </span> which can be on DFS also,
@@ -677,7 +718,7 @@
 </div>
     
     
-<a name="N10344"></a><a name="Hadoop+Rack+Awareness"></a>
+<a name="N10398"></a><a name="Hadoop+Rack+Awareness"></a>
 <h2 class="h3">Hadoop Rack Awareness</h2>
 <div class="section">
 <p>The HDFS and the Map-Reduce components are rack-aware.</p>
@@ -700,7 +741,7 @@
 </div>
     
     
-<a name="N1036A"></a><a name="Hadoop+Startup"></a>
+<a name="N103BE"></a><a name="Hadoop+Startup"></a>
 <h2 class="h3">Hadoop Startup</h2>
 <div class="section">
 <p>To start a Hadoop cluster you will need to start both the HDFS and 
@@ -735,7 +776,7 @@
 </div>
     
     
-<a name="N103B0"></a><a name="Hadoop+Shutdown"></a>
+<a name="N10404"></a><a name="Hadoop+Shutdown"></a>
 <h2 class="h3">Hadoop Shutdown</h2>
 <div class="section">
 <p>

Modified: hadoop/core/branches/branch-0.18/docs/cluster_setup.pdf
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/docs/cluster_setup.pdf?rev=668617&r1=668616&r2=668617&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/docs/cluster_setup.pdf (original)
+++ hadoop/core/branches/branch-0.18/docs/cluster_setup.pdf Tue Jun 17 04:09:39 2008
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Modified: hadoop/core/branches/branch-0.18/docs/mapred_tutorial.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.18/docs/mapred_tutorial.html?rev=668617&r1=668616&r2=668617&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.18/docs/mapred_tutorial.html (original)
+++ hadoop/core/branches/branch-0.18/docs/mapred_tutorial.html Tue Jun 17 04:09:39 2008
@@ -307,7 +307,7 @@
 <a href="#Example%3A+WordCount+v2.0">Example: WordCount v2.0</a>
 <ul class="minitoc">
 <li>
-<a href="#Source+Code-N10D94">Source Code</a>
+<a href="#Source+Code-N10DA0">Source Code</a>
 </li>
 <li>
 <a href="#Sample+Runs">Sample Runs</a>
@@ -1547,7 +1547,17 @@
         
 </p>
 <p>Users/admins can also specify the maximum virtual memory 
-        of the launched child-task using <span class="codefrag">mapred.child.ulimit</span>.</p>
+        of the launched child-task using <span class="codefrag">mapred.child.ulimit</span>.
+        The value for <span class="codefrag">mapred.child.ulimit</span> should be specified 
+        in kilo bytes (KB). And also the value must be greater than
+        or equal to the -Xmx passed to JavaVM, else the VM might not start. 
+        </p>
+<p>Note: <span class="codefrag">mapred.child.java.opts</span> are used only for 
+        configuring the launched child tasks from task tracker. Configuring 
+        the memory options for daemons is documented in 
+        <a href="cluster_setup.html#Configuring+the+Environment+of+the+Hadoop+Daemons">
+        cluster_setup.html </a>
+</p>
 <p>The task tracker has local directory,
         <span class="codefrag"> ${mapred.local.dir}/taskTracker/</span> to create localized
         cache and localized job. It can define multiple local directories 
@@ -1731,7 +1741,7 @@
         loaded via <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#loadLibrary(java.lang.String)">
         System.loadLibrary</a> or <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#load(java.lang.String)">
         System.load</a>.</p>
-<a name="N109EB"></a><a name="Job+Submission+and+Monitoring"></a>
+<a name="N109F7"></a><a name="Job+Submission+and+Monitoring"></a>
 <h3 class="h4">Job Submission and Monitoring</h3>
 <p>
 <a href="api/org/apache/hadoop/mapred/JobClient.html">
@@ -1792,7 +1802,7 @@
 <p>Normally the user creates the application, describes various facets 
         of the job via <span class="codefrag">JobConf</span>, and then uses the 
         <span class="codefrag">JobClient</span> to submit the job and monitor its progress.</p>
-<a name="N10A4B"></a><a name="Job+Control"></a>
+<a name="N10A57"></a><a name="Job+Control"></a>
 <h4>Job Control</h4>
 <p>Users may need to chain map-reduce jobs to accomplish complex
           tasks which cannot be done via a single map-reduce job. This is fairly
@@ -1828,7 +1838,7 @@
             </li>
           
 </ul>
-<a name="N10A75"></a><a name="Job+Input"></a>
+<a name="N10A81"></a><a name="Job+Input"></a>
 <h3 class="h4">Job Input</h3>
 <p>
 <a href="api/org/apache/hadoop/mapred/InputFormat.html">
@@ -1876,7 +1886,7 @@
         appropriate <span class="codefrag">CompressionCodec</span>. 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>
-<a name="N10ADF"></a><a name="InputSplit"></a>
+<a name="N10AEB"></a><a name="InputSplit"></a>
 <h4>InputSplit</h4>
 <p>
 <a href="api/org/apache/hadoop/mapred/InputSplit.html">
@@ -1890,7 +1900,7 @@
           FileSplit</a> is the default <span class="codefrag">InputSplit</span>. It sets 
           <span class="codefrag">map.input.file</span> to the path of the input file for the
           logical split.</p>
-<a name="N10B04"></a><a name="RecordReader"></a>
+<a name="N10B10"></a><a name="RecordReader"></a>
 <h4>RecordReader</h4>
 <p>
 <a href="api/org/apache/hadoop/mapred/RecordReader.html">
@@ -1902,7 +1912,7 @@
           for processing. <span class="codefrag">RecordReader</span> thus assumes the 
           responsibility of processing record boundaries and presents the tasks 
           with keys and values.</p>
-<a name="N10B27"></a><a name="Job+Output"></a>
+<a name="N10B33"></a><a name="Job+Output"></a>
 <h3 class="h4">Job Output</h3>
 <p>
 <a href="api/org/apache/hadoop/mapred/OutputFormat.html">
@@ -1927,7 +1937,7 @@
 <p>
 <span class="codefrag">TextOutputFormat</span> is the default 
         <span class="codefrag">OutputFormat</span>.</p>
-<a name="N10B50"></a><a name="Task+Side-Effect+Files"></a>
+<a name="N10B5C"></a><a name="Task+Side-Effect+Files"></a>
 <h4>Task Side-Effect Files</h4>
 <p>In some applications, component tasks need to create and/or write to
           side-files, which differ from the actual job-output files.</p>
@@ -1966,7 +1976,7 @@
 <p>The entire discussion holds true for maps of jobs with 
            reducer=NONE (i.e. 0 reduces) since output of the map, in that case, 
            goes directly to HDFS.</p>
-<a name="N10B98"></a><a name="RecordWriter"></a>
+<a name="N10BA4"></a><a name="RecordWriter"></a>
 <h4>RecordWriter</h4>
 <p>
 <a href="api/org/apache/hadoop/mapred/RecordWriter.html">
@@ -1974,9 +1984,9 @@
           pairs to an output file.</p>
 <p>RecordWriter implementations write the job outputs to the 
           <span class="codefrag">FileSystem</span>.</p>
-<a name="N10BAF"></a><a name="Other+Useful+Features"></a>
+<a name="N10BBB"></a><a name="Other+Useful+Features"></a>
 <h3 class="h4">Other Useful Features</h3>
-<a name="N10BB5"></a><a name="Counters"></a>
+<a name="N10BC1"></a><a name="Counters"></a>
 <h4>Counters</h4>
 <p>
 <span class="codefrag">Counters</span> represent global counters, defined either by 
@@ -1990,7 +2000,7 @@
           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="N10BE0"></a><a name="DistributedCache"></a>
+<a name="N10BEC"></a><a name="DistributedCache"></a>
 <h4>DistributedCache</h4>
 <p>
 <a href="api/org/apache/hadoop/filecache/DistributedCache.html">
@@ -2024,7 +2034,7 @@
           <a href="api/org/apache/hadoop/filecache/DistributedCache.html#createSymlink(org.apache.hadoop.conf.Configuration)">
           DistributedCache.createSymlink(Configuration)</a> api. Files 
           have <em>execution permissions</em> set.</p>
-<a name="N10C1E"></a><a name="Tool"></a>
+<a name="N10C2A"></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.
@@ -2064,7 +2074,7 @@
             </span>
           
 </p>
-<a name="N10C50"></a><a name="IsolationRunner"></a>
+<a name="N10C5C"></a><a name="IsolationRunner"></a>
 <h4>IsolationRunner</h4>
 <p>
 <a href="api/org/apache/hadoop/mapred/IsolationRunner.html">
@@ -2088,7 +2098,7 @@
 <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="N10C83"></a><a name="Profiling"></a>
+<a name="N10C8F"></a><a name="Profiling"></a>
 <h4>Profiling</h4>
 <p>Profiling is a utility to get a representative (2 or 3) sample
           of built-in java profiler for a sample of maps and reduces. </p>
@@ -2121,7 +2131,7 @@
           <span class="codefrag">-agentlib:hprof=cpu=samples,heap=sites,force=n,thread=y,verbose=n,file=%s</span>
           
 </p>
-<a name="N10CB7"></a><a name="Debugging"></a>
+<a name="N10CC3"></a><a name="Debugging"></a>
 <h4>Debugging</h4>
 <p>Map/Reduce framework provides a facility to run user-provided 
           scripts for debugging. When map/reduce task fails, user can run 
@@ -2132,7 +2142,7 @@
 <p> In the following sections we discuss how to submit debug script
           along with the job. For submitting debug script, first it has to
           distributed. Then the script has to supplied in Configuration. </p>
-<a name="N10CC3"></a><a name="How+to+distribute+script+file%3A"></a>
+<a name="N10CCF"></a><a name="How+to+distribute+script+file%3A"></a>
 <h5> How to distribute script file: </h5>
 <p>
           To distribute  the debug script file, first copy the file to the dfs.
@@ -2155,7 +2165,7 @@
           <a href="api/org/apache/hadoop/filecache/DistributedCache.html#createSymlink(org.apache.hadoop.conf.Configuration)">
           DistributedCache.createSymLink(Configuration) </a> api.
           </p>
-<a name="N10CDC"></a><a name="How+to+submit+script%3A"></a>
+<a name="N10CE8"></a><a name="How+to+submit+script%3A"></a>
 <h5> How to submit script: </h5>
 <p> A quick way to submit debug script is to set values for the 
           properties "mapred.map.task.debug.script" and 
@@ -2179,17 +2189,17 @@
 <span class="codefrag">$script $stdout $stderr $syslog $jobconf $program </span>  
           
 </p>
-<a name="N10CFE"></a><a name="Default+Behavior%3A"></a>
+<a name="N10D0A"></a><a name="Default+Behavior%3A"></a>
 <h5> Default Behavior: </h5>
 <p> For pipes, a default script is run to process core dumps under
           gdb, prints stack trace and gives info about running threads. </p>
-<a name="N10D09"></a><a name="JobControl"></a>
+<a name="N10D15"></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="N10D16"></a><a name="Data+Compression"></a>
+<a name="N10D22"></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
@@ -2203,7 +2213,7 @@
           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="N10D36"></a><a name="Intermediate+Outputs"></a>
+<a name="N10D42"></a><a name="Intermediate+Outputs"></a>
 <h5>Intermediate Outputs</h5>
 <p>Applications can control compression of intermediate map-outputs
             via the 
@@ -2212,7 +2222,7 @@
             <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.</p>
-<a name="N10D4B"></a><a name="Job+Outputs"></a>
+<a name="N10D57"></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)">
@@ -2232,7 +2242,7 @@
 </div>
 
     
-<a name="N10D7A"></a><a name="Example%3A+WordCount+v2.0"></a>
+<a name="N10D86"></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
@@ -2242,7 +2252,7 @@
       <a href="quickstart.html#SingleNodeSetup">pseudo-distributed</a> or
       <a href="quickstart.html#Fully-Distributed+Operation">fully-distributed</a> 
       Hadoop installation.</p>
-<a name="N10D94"></a><a name="Source+Code-N10D94"></a>
+<a name="N10DA0"></a><a name="Source+Code-N10DA0"></a>
 <h3 class="h4">Source Code</h3>
 <table class="ForrestTable" cellspacing="1" cellpadding="4">
           
@@ -3452,7 +3462,7 @@
 </tr>
         
 </table>
-<a name="N114F6"></a><a name="Sample+Runs"></a>
+<a name="N11502"></a><a name="Sample+Runs"></a>
 <h3 class="h4">Sample Runs</h3>
 <p>Sample text-files as input:</p>
 <p>
@@ -3620,7 +3630,7 @@
 <br>
         
 </p>
-<a name="N115CA"></a><a name="Highlights"></a>
+<a name="N115D6"></a><a name="Highlights"></a>
 <h3 class="h4">Highlights</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: