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From omal...@apache.org
Subject svn commit: r706341 [1/4] - in /hadoop/core/branches/branch-0.19: ./ docs/ src/docs/src/documentation/content/xdocs/
Date Mon, 20 Oct 2008 17:12:39 GMT
Author: omalley
Date: Mon Oct 20 10:12:38 2008
New Revision: 706341

URL: http://svn.apache.org/viewvc?rev=706341&view=rev
Log:
HADOOP-4321. Include documentation for the capacity scheduler. (Hemanth 
Yamijala via omalley)
Merge -r 706337:706338 from trunk to branch 0.19.

Added:
    hadoop/core/branches/branch-0.19/docs/capacity_scheduler.html
    hadoop/core/branches/branch-0.19/docs/capacity_scheduler.pdf
    hadoop/core/branches/branch-0.19/src/docs/src/documentation/content/xdocs/capacity_scheduler.xml
      - copied unchanged from r706338, hadoop/core/trunk/src/docs/src/documentation/content/xdocs/capacity_scheduler.xml
Modified:
    hadoop/core/branches/branch-0.19/CHANGES.txt
    hadoop/core/branches/branch-0.19/docs/SLG_user_guide.html
    hadoop/core/branches/branch-0.19/docs/changes.html
    hadoop/core/branches/branch-0.19/docs/cluster_setup.html
    hadoop/core/branches/branch-0.19/docs/cluster_setup.pdf
    hadoop/core/branches/branch-0.19/docs/commands_manual.html
    hadoop/core/branches/branch-0.19/docs/distcp.html
    hadoop/core/branches/branch-0.19/docs/hadoop_archives.html
    hadoop/core/branches/branch-0.19/docs/hdfs_design.html
    hadoop/core/branches/branch-0.19/docs/hdfs_permissions_guide.html
    hadoop/core/branches/branch-0.19/docs/hdfs_quota_admin_guide.html
    hadoop/core/branches/branch-0.19/docs/hdfs_shell.html
    hadoop/core/branches/branch-0.19/docs/hdfs_user_guide.html
    hadoop/core/branches/branch-0.19/docs/hod.html
    hadoop/core/branches/branch-0.19/docs/hod_admin_guide.html
    hadoop/core/branches/branch-0.19/docs/hod_config_guide.html
    hadoop/core/branches/branch-0.19/docs/hod_user_guide.html
    hadoop/core/branches/branch-0.19/docs/index.html
    hadoop/core/branches/branch-0.19/docs/linkmap.html
    hadoop/core/branches/branch-0.19/docs/linkmap.pdf
    hadoop/core/branches/branch-0.19/docs/mapred_tutorial.html
    hadoop/core/branches/branch-0.19/docs/mapred_tutorial.pdf
    hadoop/core/branches/branch-0.19/docs/native_libraries.html
    hadoop/core/branches/branch-0.19/docs/quickstart.html
    hadoop/core/branches/branch-0.19/docs/streaming.html
    hadoop/core/branches/branch-0.19/src/docs/src/documentation/content/xdocs/cluster_setup.xml
    hadoop/core/branches/branch-0.19/src/docs/src/documentation/content/xdocs/mapred_tutorial.xml
    hadoop/core/branches/branch-0.19/src/docs/src/documentation/content/xdocs/site.xml

Modified: hadoop/core/branches/branch-0.19/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.19/CHANGES.txt?rev=706341&r1=706340&r2=706341&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.19/CHANGES.txt (original)
+++ hadoop/core/branches/branch-0.19/CHANGES.txt Mon Oct 20 10:12:38 2008
@@ -442,6 +442,9 @@
     HADOOP-4150. Include librecordio in hadoop releases. (Giridharan Kesavan
     via acmurthy) 
 
+    HADOOP-4321. Include documentation for the capacity scheduler. (Hemanth 
+    Yamijala via omalley)
+
   OPTIMIZATIONS
 
     HADOOP-3556. Removed lock contention in MD5Hash by changing the 

Modified: hadoop/core/branches/branch-0.19/docs/SLG_user_guide.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.19/docs/SLG_user_guide.html?rev=706341&r1=706340&r2=706341&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.19/docs/SLG_user_guide.html (original)
+++ hadoop/core/branches/branch-0.19/docs/SLG_user_guide.html Mon Oct 20 10:12:38 2008
@@ -153,6 +153,9 @@
 <a href="hod.html">Hadoop On Demand</a>
 </div>
 <div class="menuitem">
+<a href="capacity_scheduler.html">Capacity Scheduler</a>
+</div>
+<div class="menuitem">
 <a href="api/index.html">API Docs</a>
 </div>
 <div class="menuitem">

Added: hadoop/core/branches/branch-0.19/docs/capacity_scheduler.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.19/docs/capacity_scheduler.html?rev=706341&view=auto
==============================================================================
--- hadoop/core/branches/branch-0.19/docs/capacity_scheduler.html (added)
+++ hadoop/core/branches/branch-0.19/docs/capacity_scheduler.html Mon Oct 20 10:12:38 2008
@@ -0,0 +1,519 @@
+<!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="0.8">
+<meta name="Forrest-skin-name" content="pelt">
+<title>Capacity Scheduler</title>
+<link type="text/css" href="skin/basic.css" rel="stylesheet">
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+<link rel="shortcut icon" href="images/favicon.ico">
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+<body onload="init()">
+<script type="text/javascript">ndeSetTextSize();</script>
+<div id="top">
+<!--+
+    |breadtrail
+    +-->
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+<!--+
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+</div>
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+</div>
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+</div>
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+</div>
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+</div>
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+<div class="menupagetitle">Capacity Scheduler</div>
+</div>
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+<div id="credit"></div>
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+<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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+<div id="credit2"></div>
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+<!--+
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+<div title="Portable Document Format" class="pdflink">
+<a class="dida" href="capacity_scheduler.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
+        PDF</a>
+</div>
+<h1>Capacity Scheduler</h1>
+<div id="minitoc-area">
+<ul class="minitoc">
+<li>
+<a href="#Purpose">Purpose</a>
+</li>
+<li>
+<a href="#Features">Features</a>
+</li>
+<li>
+<a href="#Picking+a+task+to+run">Picking a task to run</a>
+</li>
+<li>
+<a href="#Reclaiming+capacity">Reclaiming capacity</a>
+</li>
+<li>
+<a href="#Installation">Installation</a>
+</li>
+<li>
+<a href="#Configuration">Configuration</a>
+<ul class="minitoc">
+<li>
+<a href="#Using+the+capacity+scheduler">Using the capacity scheduler</a>
+</li>
+<li>
+<a href="#Setting+up+queues">Setting up queues</a>
+</li>
+<li>
+<a href="#Configuring+properties+for+queues">Configuring properties for queues</a>
+</li>
+<li>
+<a href="#Reviewing+the+configuration+of+the+capacity+scheduler">Reviewing the configuration of the capacity scheduler</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+  
+    
+<a name="N1000D"></a><a name="Purpose"></a>
+<h2 class="h3">Purpose</h2>
+<div class="section">
+<p>This document describes the Capacity Scheduler, a pluggable Map/Reduce scheduler for Hadoop which provides a way to share large clusters.</p>
+</div>
+    
+    
+<a name="N10017"></a><a name="Features"></a>
+<h2 class="h3">Features</h2>
+<div class="section">
+<p>The Capacity Scheduler supports the following features:</p>
+<ul>
+        
+<li>
+          Support for multiple queues, where a job is submitted to a queue.
+        </li>
+        
+<li>
+          Queues are guaranteed a fraction of the capacity of the grid (their 
+ 	      'guaranteed capacity') in the sense that a certain capacity of 
+ 	      resources will be at their disposal. All jobs submitted to the a 
+ 	      queue will have access to the capacity guaranteed to the queue.
+        </li>
+        
+<li>
+          Free resources can be allocated to any queue beyond its guaranteed 
+          capacity. These excess allocated resources can be reclaimed and made 
+          available to another queue in order to meet its capacity guarantee.
+        </li>
+        
+<li>
+          The scheduler guarantees that excess resources taken from a queue 
+          will be restored to it within N minutes of its need for them.
+        </li>
+        
+<li>
+          Queues optionally support job priorities (disabled by default).
+        </li>
+        
+<li>
+          Within a queue, jobs with higher priority will have access to the 
+          queue's resources before jobs with lower priority. However, once a 
+          job is running, it will not be preempted for a higher priority job.
+        </li>
+        
+<li>
+          In order to prevent one or more users from monopolizing its 
+          resources, each queue enforces a limit on the percentage of 
+          resources allocated to a user at any given time, if there is 
+          competition for them.  
+        </li>
+        
+<li>
+          Support for memory-intensive jobs, wherein a job can optionally 
+          specify higher memory-requirements than the default, and the tasks 
+          of the job will only be run on TaskTrackers that have enough memory 
+          to spare.
+        </li>
+      
+</ul>
+</div>
+    
+    
+<a name="N1003C"></a><a name="Picking+a+task+to+run"></a>
+<h2 class="h3">Picking a task to run</h2>
+<div class="section">
+<p>Note that many of these steps can be, and will be, enhanced over time
+      to provide better algorithms.</p>
+<p>Whenever a TaskTracker is free, the Capacity Scheduler first picks a 
+      queue that needs to reclaim any resources the earliest (this is a queue
+      whose resources were temporarily being used by some other queue and now
+      needs access to those resources). If no such queue is found, it then picks
+      a queue which has most free space (whose ratio of # of running slots to 
+      guaranteed capacity is the lowest).</p>
+<p>Once a queue is selected, the scheduler picks a job in the queue. Jobs
+      are sorted based on when they're submitted and their priorities (if the 
+      queue supports priorities). Jobs are considered in order, and a job is 
+      selected if its user is within the user-quota for the queue, i.e., the 
+      user is not already using queue resources above his/her limit. The 
+      scheduler also makes sure that there is enough free memory in the 
+      TaskTracker to tun the job's task, in case the job has special memory
+      requirements.</p>
+<p>Once a job is selected, the scheduler picks a task to run. This logic 
+      to pick a task remains unchanged from earlier versions.</p>
+</div>
+    
+    
+<a name="N1004F"></a><a name="Reclaiming+capacity"></a>
+<h2 class="h3">Reclaiming capacity</h2>
+<div class="section">
+<p>Periodically, the scheduler determines:</p>
+<ul>
+	    
+<li>
+	      if a queue needs to reclaim capacity. This happens when a queue has
+	      at least one task pending and part of its guaranteed capacity is 
+	      being used by some other queue. If this happens, the scheduler notes
+	      the amount of resources it needs to reclaim for this queue within a 
+	      specified period of time (the reclaim time). 
+	    </li>
+	    
+<li>
+	      if a queue has not received all the resources it needed to reclaim,
+	      and its reclaim time is about to expire. In this case, the scheduler
+	      needs to kill tasks from queues running over capacity. This it does
+	      by killing the tasks that started the latest.
+	    </li>
+	  
+</ul>
+</div>
+
+    
+<a name="N10062"></a><a name="Installation"></a>
+<h2 class="h3">Installation</h2>
+<div class="section">
+<p>The capacity scheduler is available as a JAR file in the Hadoop
+        tarball under the <em>contrib/capacity-scheduler</em> directory. The name of 
+        the JAR file would be on the lines of hadoop-*-capacity-scheduler.jar.</p>
+<p>You can also build the scheduler from source by executing
+        <em>ant package</em>, in which case it would be available under
+        <em>build/contrib/capacity-scheduler</em>.</p>
+<p>To run the capacity scheduler in your Hadoop installation, you need 
+        to put it on the <em>CLASSPATH</em>. The easiest way is to copy the 
+        <span class="codefrag">hadoop-*-capacity-scheduler.jar</span> from 
+        to <span class="codefrag">HADOOP_HOME/lib</span>. Alternatively, you can modify 
+        <em>HADOOP_CLASSPATH</em> to include this jar, in 
+        <span class="codefrag">conf/hadoop-env.sh</span>.</p>
+</div>
+
+    
+<a name="N1008A"></a><a name="Configuration"></a>
+<h2 class="h3">Configuration</h2>
+<div class="section">
+<a name="N10090"></a><a name="Using+the+capacity+scheduler"></a>
+<h3 class="h4">Using the capacity scheduler</h3>
+<p>
+          To make the Hadoop framework use the capacity scheduler, set up
+          the following property in the site configuration:</p>
+<table class="ForrestTable" cellspacing="1" cellpadding="4">
+            
+<tr>
+              
+<td colspan="1" rowspan="1">Property</td>
+              <td colspan="1" rowspan="1">Value</td>
+            
+</tr>
+            
+<tr>
+              
+<td colspan="1" rowspan="1">mapred.jobtracker.taskScheduler</td>
+              <td colspan="1" rowspan="1">org.apache.hadoop.mapred.CapacityTaskScheduler</td>
+            
+</tr>
+          
+</table>
+<a name="N100B7"></a><a name="Setting+up+queues"></a>
+<h3 class="h4">Setting up queues</h3>
+<p>
+          You can define multiple queues to which users can submit jobs with
+          the capacity scheduler. To define multiple queues, you should edit
+          the site configuration for Hadoop and modify the
+          <em>mapred.queue.names</em> property.
+        </p>
+<p>
+          You can also configure ACLs for controlling which users or groups
+          have access to the queues.
+        </p>
+<p>
+          For more details, refer to
+          <a href="cluster_setup.html#Configuring+the+Hadoop+Daemons">Cluster 
+          Setup</a> documentation.
+        </p>
+<a name="N100CE"></a><a name="Configuring+properties+for+queues"></a>
+<h3 class="h4">Configuring properties for queues</h3>
+<p>The capacity scheduler can be configured with several properties
+        for each queue that control the behavior of the scheduler. This
+        configuration is in the <em>conf/capacity-scheduler.xml</em>. By
+        default, the configuration is set up for one queue, named 
+        <em>default</em>.</p>
+<p>To specify a property for a queue that is defined in the site
+        configuration, you should use the property name as
+        <em>mapred.capacity-scheduler.queue.&lt;queue-name&gt;.&lt;property-name&gt;</em>.
+        </p>
+<p>For example, to define the property <em>guaranteed-capacity</em>
+        for queue named <em>research</em>, you should specify the property
+        name as 
+        <em>mapred.capacity-scheduler.queue.research.guaranteed-capacity</em>.
+        </p>
+<p>The properties defined for queues and their descriptions are
+        listed in the table below:</p>
+<table class="ForrestTable" cellspacing="1" cellpadding="4">
+          
+<tr>
+<th colspan="1" rowspan="1">Name</th><th colspan="1" rowspan="1">Description</th>
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">mapred.capacity-scheduler.queue.&lt;queue-name&gt;.guaranteed-capacity</td>
+          	<td colspan="1" rowspan="1">Percentage of the number of slots in the cluster that are
+          	guaranteed to be available for jobs in this queue. 
+          	The sum of guaranteed capacities for all queues should be less 
+          	than or equal 100.</td>
+          
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">mapred.capacity-scheduler.queue.&lt;queue-name&gt;.reclaim-time-limit</td>
+          	<td colspan="1" rowspan="1">The amount of time, in seconds, before which resources 
+          	distributed to other queues will be reclaimed.</td>
+          
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">mapred.capacity-scheduler.queue.&lt;queue-name&gt;.supports-priority</td>
+          	<td colspan="1" rowspan="1">If true, priorities of jobs will be taken into account in scheduling 
+          	decisions.</td>
+          
+</tr>
+          
+<tr>
+<td colspan="1" rowspan="1">mapred.capacity-scheduler.queue.&lt;queue-name&gt;.minimum-user-limit-percent</td>
+          	<td colspan="1" rowspan="1">Each queue enforces a limit on the percentage of resources 
+          	allocated to a user at any given time, if there is competition 
+          	for them. This user limit can vary between a minimum and maximum 
+          	value. The former depends on the number of users who have submitted
+          	jobs, and the latter is set to this property value. For example, 
+          	suppose the value of this property is 25. If two users have 
+          	submitted jobs to a queue, no single user can use more than 50% 
+          	of the queue resources. If a third user submits a job, no single 
+          	user can use more than 33% of the queue resources. With 4 or more 
+          	users, no user can use more than 25% of the queue's resources. A 
+          	value of 100 implies no user limits are imposed.</td>
+          
+</tr>
+        
+</table>
+<a name="N10130"></a><a name="Reviewing+the+configuration+of+the+capacity+scheduler"></a>
+<h3 class="h4">Reviewing the configuration of the capacity scheduler</h3>
+<p>
+          Once the installation and configuration is completed, you can review
+          it after starting the Map/Reduce cluster from the admin UI.
+        </p>
+<ul>
+          
+<li>Start the Map/Reduce cluster as usual.</li>
+          
+<li>Open the JobTracker web UI.</li>
+          
+<li>The queues you have configured should be listed under the <em>Scheduling
+              Information</em> section of the page.</li>
+          
+<li>The properties for the queues should be visible in the <em>Scheduling
+              Information</em> column against each queue.</li>
+        
+</ul>
+</div>
+  
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+        Copyright &copy;
+         2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
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Added: hadoop/core/branches/branch-0.19/docs/capacity_scheduler.pdf
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.19/docs/capacity_scheduler.pdf?rev=706341&view=auto
==============================================================================
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Modified: hadoop/core/branches/branch-0.19/docs/changes.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.19/docs/changes.html?rev=706341&r1=706340&r2=706341&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.19/docs/changes.html (original)
+++ hadoop/core/branches/branch-0.19/docs/changes.html Mon Oct 20 10:12:38 2008
@@ -205,7 +205,7 @@
     </ol>
   </li>
   <li><a href="javascript:toggleList('release_0.19.0_-_unreleased_._improvements_')">  IMPROVEMENTS
-</a>&nbsp;&nbsp;&nbsp;(74)
+</a>&nbsp;&nbsp;&nbsp;(75)
     <ol id="release_0.19.0_-_unreleased_._improvements_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4205">HADOOP-4205</a>. hive: metastore and ql to use the refactored SerDe library.<br />(zshao)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4106">HADOOP-4106</a>. libhdfs: add time, permission and user attribute support
@@ -338,6 +338,8 @@
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-3790">HADOOP-3790</a>. Add more unit tests for testing HDFS file append.<br />(szetszwo)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4150">HADOOP-4150</a>. Include librecordio in hadoop releases.<br />(Giridharan Kesavan
 via acmurthy)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4321">HADOOP-4321</a>. Include documentation for the capacity scheduler.<br />(Hemanth
+Yamijala via omalley)</li>
     </ol>
   </li>
   <li><a href="javascript:toggleList('release_0.19.0_-_unreleased_._optimizations_')">  OPTIMIZATIONS
@@ -370,7 +372,7 @@
     </ol>
   </li>
   <li><a href="javascript:toggleList('release_0.19.0_-_unreleased_._bug_fixes_')">  BUG FIXES
-</a>&nbsp;&nbsp;&nbsp;(133)
+</a>&nbsp;&nbsp;&nbsp;(139)
     <ol id="release_0.19.0_-_unreleased_._bug_fixes_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-3563">HADOOP-3563</a>.  Refactor the distributed upgrade code so that it is
 easier to identify datanode and namenode related code.<br />(dhruba)</li>
@@ -618,12 +620,21 @@
 Phillips via cdouglas)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4426">HADOOP-4426</a>. TestCapacityScheduler broke due to the two commits <a href="http://issues.apache.org/jira/browse/HADOOP-4053">HADOOP-4053</a>
 and <a href="http://issues.apache.org/jira/browse/HADOOP-4373">HADOOP-4373</a>. This patch fixes that.<br />(Hemanth Yamijala via ddas)</li>
-      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4278">HADOOP-4278</a>. Increase debug logging for unit test TestDatanodeDeath.<br />(dhruba)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4418">HADOOP-4418</a>. Updates documentation in forrest for Mapred, streaming and pipes.<br />(Amareshwari Sriramadasu via ddas)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-3155">HADOOP-3155</a>. Ensure that there is only one thread fetching
 TaskCompletionEvents on TaskTracker re-init.<br />(Dhruba Borthakur via
 acmurthy)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4425">HADOOP-4425</a>. Fix EditLogInputStream to overload the bulk read method.<br />(cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4427">HADOOP-4427</a>. Adds the new queue/job commands to the manual.<br />(Sreekanth Ramakrishnan via ddas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4278">HADOOP-4278</a>. Increase debug logging for unit test TestDatanodeDeath.
+Fix the case when primary is dead.<br />(dhruba via szetszwo)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4423">HADOOP-4423</a>. Keep block length when the block recovery is triggered by
+append.<br />(szetszwo)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4449">HADOOP-4449</a>. Fix dfsadmin usage.<br />(Raghu Angadi via cdouglas)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4455">HADOOP-4455</a>. Added TestSerDe so that unit tests can run successfully.<br />(Ashish Thusoo via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4399">HADOOP-4399</a>. Make fuse-dfs multi-thread access safe.<br />(Pete Wyckoff via dhruba)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4457">HADOOP-4457</a>. Fixes an input split logging problem introduced by
+<a href="http://issues.apache.org/jira/browse/HADOOP-3245">HADOOP-3245</a>.<br />(Amareshwari Sriramadasu via ddas)</li>
     </ol>
   </li>
 </ul>
@@ -631,7 +642,7 @@
 </a></h2>
 <ul id="release_0.18.2_-_unreleased_">
   <li><a href="javascript:toggleList('release_0.18.2_-_unreleased_._bug_fixes_')">  BUG FIXES
-</a>&nbsp;&nbsp;&nbsp;(7)
+</a>&nbsp;&nbsp;&nbsp;(8)
     <ol id="release_0.18.2_-_unreleased_._bug_fixes_">
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4116">HADOOP-4116</a>. Balancer should provide better resource management.<br />(hairong)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-3614">HADOOP-3614</a>. Fix a bug that Datanode may use an old GenerationStamp to get
@@ -644,6 +655,8 @@
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4351">HADOOP-4351</a>. FSNamesystem.getBlockLocationsInternal throws
 ArrayIndexOutOfBoundsException.<br />(hairong)</li>
       <li><a href="http://issues.apache.org/jira/browse/HADOOP-4292">HADOOP-4292</a>. Do not support append() for LocalFileSystem.<br />(hairong)</li>
+      <li><a href="http://issues.apache.org/jira/browse/HADOOP-4398">HADOOP-4398</a>. No need to truncate access time in INode. Also fixes NPE
+in CreateEditsLog.<br />(Raghu Angadi)</li>
     </ol>
   </li>
 </ul>

Modified: hadoop/core/branches/branch-0.19/docs/cluster_setup.html
URL: http://svn.apache.org/viewvc/hadoop/core/branches/branch-0.19/docs/cluster_setup.html?rev=706341&r1=706340&r2=706341&view=diff
==============================================================================
--- hadoop/core/branches/branch-0.19/docs/cluster_setup.html (original)
+++ hadoop/core/branches/branch-0.19/docs/cluster_setup.html Mon Oct 20 10:12:38 2008
@@ -153,6 +153,9 @@
 <a href="hod.html">Hadoop On Demand</a>
 </div>
 <div class="menuitem">
+<a href="capacity_scheduler.html">Capacity Scheduler</a>
+</div>
+<div class="menuitem">
 <a href="api/index.html">API Docs</a>
 </div>
 <div class="menuitem">
@@ -518,13 +521,84 @@
 		      </td>
   		    
 </tr>
+        
+<tr>
+          
+<td colspan="1" rowspan="1">mapred.queue.names</td>
+          <td colspan="1" rowspan="1">Comma separated list of queues to which jobs can be submitted.</td>
+          <td colspan="1" rowspan="1">
+            The Map/Reduce system always supports atleast one queue
+            with the name as <em>default</em>. Hence, this parameter's
+            value should always contain the string <em>default</em>.
+            Some job schedulers supported in Hadoop, like the 
+            <a href="capacity_scheduler.html">Capacity 
+            Scheduler</a>, support multiple queues. If such a scheduler is
+            being used, the list of configured queue names must be
+            specified here. Once queues are defined, users can submit
+            jobs to a queue using the property name 
+            <em>mapred.job.queue.name</em> in the job configuration.
+            There could be a separate 
+            configuration file for configuring properties of these 
+            queues that is managed by the scheduler. 
+            Refer to the documentation of the scheduler for information on 
+            the same.
+          </td>
+        
+</tr>
+        
+<tr>
+          
+<td colspan="1" rowspan="1">mapred.acls.enabled</td>
+          <td colspan="1" rowspan="1">Specifies whether ACLs are supported for controlling job
+              submission and administration</td>
+          <td colspan="1" rowspan="1">
+            If <em>true</em>, ACLs would be checked while submitting
+            and administering jobs. ACLs can be specified using the
+            configuration parameters of the form
+            <em>mapred.queue.queue-name.acl-name</em>, defined below.
+          </td>
+        
+</tr>
+        
+<tr>
+          
+<td colspan="1" rowspan="1">mapred.queue.<em>queue-name</em>.acl-submit-job</td>
+          <td colspan="1" rowspan="1">List of users and groups that can submit jobs to the
+              specified <em>queue-name</em>.</td>
+          <td colspan="1" rowspan="1">
+            The list of users and groups are both comma separated
+            list of names. The two lists are separated by a blank.
+            Example: <em>user1,user2 group1,group2</em>.
+            If you wish to define only a list of groups, provide
+            a blank at the beginning of the value.
+          </td>
+        
+</tr>
+        
+<tr>
+          
+<td colspan="1" rowspan="1">mapred.queue.<em>queue-name</em>.acl-administer-job</td>
+          <td colspan="1" rowspan="1">List of users and groups that can change the priority
+              or kill jobs that have been submitted to the
+              specified <em>queue-name</em>.</td>
+          <td colspan="1" rowspan="1">
+            The list of users and groups are both comma separated
+            list of names. The two lists are separated by a blank.
+            Example: <em>user1,user2 group1,group2</em>.
+            If you wish to define only a list of groups, provide
+            a blank at the beginning of the value. Note that an
+            owner of a job can always change the priority or kill
+            his/her own job, irrespective of the ACLs.
+          </td>
+        
+</tr>
 		  
 </table>
 <p>Typically all the above parameters are marked as 
           <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="N1020F"></a><a name="Real-World+Cluster+Configurations"></a>
+<a name="N1027C"></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 
@@ -685,7 +759,7 @@
 </li>
             
 </ul>
-<a name="N1032D"></a><a name="Slaves"></a>
+<a name="N1039A"></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 
@@ -694,14 +768,14 @@
           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="N1034C"></a><a name="Logging"></a>
+<a name="N103B9"></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="N10360"></a><a name="History+Logging"></a>
+<a name="N103CD"></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,
@@ -734,10 +808,10 @@
       typically <span class="codefrag">${HADOOP_HOME}/conf</span>.</p>
 </div>
     
-<a name="N10398"></a><a name="Cluster+Restartability"></a>
+<a name="N10405"></a><a name="Cluster+Restartability"></a>
 <h2 class="h3">Cluster Restartability</h2>
 <div class="section">
-<a name="N1039E"></a><a name="Map%2FReduce"></a>
+<a name="N1040B"></a><a name="Map%2FReduce"></a>
 <h3 class="h4">Map/Reduce</h3>
 <p>The job tracker restart can recover running jobs if 
         <span class="codefrag">mapred.jobtracker.restart.recover</span> is set true and 
@@ -748,7 +822,7 @@
 </div>
     
     
-<a name="N103B3"></a><a name="Hadoop+Rack+Awareness"></a>
+<a name="N10420"></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>
@@ -771,7 +845,7 @@
 </div>
     
     
-<a name="N103D9"></a><a name="Hadoop+Startup"></a>
+<a name="N10446"></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 
@@ -806,7 +880,7 @@
 </div>
     
     
-<a name="N1041F"></a><a name="Hadoop+Shutdown"></a>
+<a name="N1048C"></a><a name="Hadoop+Shutdown"></a>
 <h2 class="h3">Hadoop Shutdown</h2>
 <div class="section">
 <p>



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