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From yus...@apache.org
Subject svn commit: r1444637 [13/27] - in /incubator/ambari/site/1.2.1: ./ installing-hadoop-using-ambari/ installing-hadoop-using-ambari/common/ installing-hadoop-using-ambari/common/css/ installing-hadoop-using-ambari/common/images/ installing-hadoop-using-a...
Date Mon, 11 Feb 2013 00:28:33 GMT
Added: incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-6.html
URL: http://svn.apache.org/viewvc/incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-6.html?rev=1444637&view=auto
==============================================================================
--- incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-6.html (added)
+++ incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-6.html Mon Feb 11 00:28:28 2013
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE html
+  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:exsl="http://exslt.org/common" xmlns:ng="http://docbook.org/docbook-ng" xmlns:fb="http://ogp.me/ns/fb#"><head>
+<meta http-equiv="X-UA-Compatible" content="IE=7"/>
+<title>7. Assign Slaves and Clients - Apache Ambari
+    </title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="mavenGroupId" content="ambari.docs"/><meta name="mavenArtifactId" content="Ambari"/><meta name="mavenVersionId" content="1.2.0"/><link rel="home" href="index.html" title="Apache Ambari"/><link rel="up" href="ambari-chap3.html" title="Chapter 3. Installing, Configuring, and Deploying the Cluster"/><link rel="prev" href="ambari-chap3-5.html" title="6. Assign Masters"/><link rel="next" href="ambari-chap3-7.html" title="8. Customize Services"/><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><script type="text/javascript">
+            //The id for tree cookie
+            var treeCookieId = "treeview-3955";
+            var language = "en";
+            var w = new Object();
+            //Localization
+            txt_filesfound = 'Results';
+            txt_enter_at_least_1_char = "You must enter at least one character.";
+            txt_browser_not_supported = "Your browser is not supported. Use of Mozilla Firefox is recommended.";
+            txt_please_wait = "Please wait. Search in progress...";
+            txt_results_for = "Results for: ";
+        </script><style type="text/css">
+            input {
+            margin-bottom: 5px;
+            margin-top: 2px;
+            }
+
+            .folder {
+            display: block;
+            height: 22px;
+            padding-left: 20px;
+            background: transparent url(../common/jquery/treeview/images/folder.gif) 0 0px no-repeat;
+            }
+            
+        </style><link rel="shortcut icon" href="../favicon.ico" type="image/x-icon"/><link rel="stylesheet" type="text/css" href="../common/css/positioning.css"/><link rel="stylesheet" type="text/css" href="../common/css/custom.css"/><!--[if IE]>
+	<link rel="stylesheet" type="text/css" href="../common/css/ie.css"/>
+	<![endif]--><link rel="stylesheet" type="text/css" href="../common/jquery/theme-redmond/jquery-ui-1.8.2.custom.css"/><link rel="stylesheet" type="text/css" href="../common/jquery/treeview/jquery.treeview.css"/><script type="text/javascript" src="../common/jquery/jquery-1.4.3.min.js"><!----></script><script type="text/javascript" src="../common/jquery/jquery-ui-1.8.2.custom.min.js"><!----></script><script type="text/javascript" src="../common/jquery/jquery.cookie.js"><!----></script><script type="text/javascript" src="../common/jquery/treeview/jquery.treeview.min.js"><!----></script><script type="text/javascript" src="../common/jquery/jquery.qtip-1.0.0-rc3/jquery.qtip-1.0.0-rc3.min.js"><!--jQuery plugin for glossary popups. --></script><script type="text/javascript" src="search/htmlFileList.js"><!----></script><script type="text/javascript" src="search/htmlFileInfoList.js"><!----></script><script type="text/javascript" src="search/nwSearchFnt.js"><!----></script><script type
 ="text/javascript" src="search/stemmers/en_stemmer.js"><!--//make this scalable to other languages as well.--></script><script type="text/javascript" src="search/index-1.js"><!----></script><script type="text/javascript" src="search/index-2.js"><!----></script><script type="text/javascript" src="search/index-3.js"><!----></script></head><body><div id="header"><a onclick="_gaq.push(['_trackEvent', 'Header', 'logo', 'click', 1]);" target="_blank" href="http://incubator.apache.org/ambari/"><img src="../common/images/ambari-logo.png" alt="Ambari" width="60" height="60"/></a><h1>7. Assign Slaves and Clients</h1><div id="navheader" align="right"><!----><table class="navLinks"><tr><td><a id="showHideButton" onclick="showHideToc(); _gaq.push(['_trackEvent', 'Header', 'show/hide', 'click', 1]);" class="pointLeft" title="Hide TOC tree">Sidebar
+                            </a></td><td><a accesskey="p" class="navLinkPrevious" onclick="_gaq.push(['_trackEvent', 'Header', 'prevLink', 'click', 1]);" tabindex="5" href="ambari-chap3-5.html">Prev</a>
+				      |
+                                        <a accesskey="u" class="navLinkUp" onclick="_gaq.push(['_trackEvent', 'Header', 'upLink', 'click', 1]);" tabindex="5" href="ambari-chap3.html">Up</a>
+				  |
+                                    <a accesskey="n" class="navLinkNext" onclick="_gaq.push(['_trackEvent', 'Header', 'nextLink', 'click', 1]);" tabindex="5" href="ambari-chap3-7.html">Next</a></td></tr></table></div></div><div id="toolbar" class="ui-tabs-nav ui-helper-reset ui-helper-clearfix ui-widget-header ui-corner-all"><div id="toolbar-left"><p class="breadcrumbs"><a href="http://incubator.apache.org/ambari">Ambari Project Website</a><a href="index.html">Ambari User Guide</a></p></div></div><div id="content"><div class="statustext"> </div><div class="section"><div xmlns="" class="titlepage"><div><div><h2 xmlns="http://www.w3.org/1999/xhtml" class="title" style="clear: both"><a id="ambari-chap3-6"> </a>7. Assign Slaves and Clients</h2></div></div></div><p>The Ambari install wizard attempts to assign the slave components (DataNodes, TaskTrackers,
+and RegionServers) to appropriate hosts in your cluster. It also attempts to select hosts for
+installing the appropriate set of clients.</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>Use <span class="bold"><strong>all</strong></span> or <span class="bold"><strong>none</strong></span> to select
+all of the hosts in the column or none of the hosts, respectively. </p><p>If a host has a red asterisk next to it, that host is also running one or more master
+components.  Hover your mouse over the asterisk to see which master components are on that host.  </p></li><li class="listitem"><p>Fine-tune your selections by using the checkboxes next to specific hosts.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../common/images/admon/note.png"/></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>As an option you can start the HBase REST server manually after the install process is
+complete. It can be started on any host that has the HBase Master or the Region Server installed. If
+you attempt to start it on the same host as the Ambari server, however, you need to start it with
+the -p option, as its default port is 8080 and that conflicts with the Ambari Web default port.
+</p><pre class="screen">/usr/lib/hbase/bin/hbase-daemon.sh start rest -p &lt;custom_port_number&gt;</pre><p>
+</p></td></tr></table></div></li><li class="listitem"><p>When you are satisfied with your assignments, click the <span class="bold"><strong>Next</strong></span>
+button.</p></li></ol></div></div><script type="text/javascript" src="../common/main.js"><!----></script><hr/><div class="legal"><a href="index.html">Index</a></div></div><div><div id="leftnavigation" style="padding-top:3px; background-color:white;"><div id="tabs"><ul><li><a href="#treeDiv" tabindex="1"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv" tabindex="1"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="../common/images/loading.gif" alt="loading table of contents..." id="tocLoading" style="display:block;"/><div id="ulTreeDiv" style="display:none" class="thisisthat"><ul id="tree" class="filetree"><li tabindex="2"><span class="file"><a href="ambari-chap1.html">1. Getting Ready to Install</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-1.html">1. Understand the Basics</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html">2. Meet Minimum System Requirements</a></spa
 n><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-1">2.1. Hardware Recommendations</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-2">2.2. Operating Systems Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-3">2.3. Browser Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-4">2.4. Software Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-5">2.5. Database Requirements</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap1-3.html">3. Decide on Deployment Type</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-4.html">4. Collect Information</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5.html">5. Prepare the Environment</a></span><ul><li tabindex="2"
 ><span class="file"><a href="ambari-chap1-5-1.html">5.1. Check Existing Installs</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-2.html">5.2. Set Up Password-less SSH</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-3.html">5.3. Enable NTP on the Cluster and on the Browser Host</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-4.html">5.4. Check DNS</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-5.html">5.5. Disable SELinux</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-6.html">5.6. Disable iptables</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap1-6.html">6. Optional: Configure the Local Repositories</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2.html">2. Running the Installer</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2-1.html">1. Set Up the Bits<
 /a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2.1.1.html">1.1. RHEL/CentOS 5.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2.1.2.html">1.2. RHEL/CentOS 6.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2.1.3.html">1.3. SLES 11</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2-2.html">2. Set Up the  Server</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2-2-1.html">2.1. Setup Options</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2-4.html">3. Optional: Set Up LDAP Authentication</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2-3.html">4. Start the Ambari Server</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap3.html">3. Installing, Configuring, and Deploying the Cluster</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap3-1.html">1. Log int
 o Apache Ambari</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-2.html">2. Welcome</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-3.html">3. Install Options</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-4.html">4. Confirm Hosts</a></span></li><li tabindex="2"><span class="file"><a href="ch03s05.html">5. Choose Services</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-5.html">6. Assign Masters</a></span></li><li tabindex="2" id="webhelp-currentid"><span class="file"><a href="ambari-chap3-6.html">7. Assign Slaves and Clients</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7.html">8. Customize Services</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap3-7-1.html">8.1. HDFS</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-2.html">8.2. MapReduce</a></span></li><li tabindex="2"><span class="file"><a href="ambar
 i-chap3-7-3.html">8.3. Hive/HCat </a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-4.html">8.4. WebHCat</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-5.html">8.5. HBase</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-6.html">8.6. ZooKeeper</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-7.html">8.7. Oozie</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-9.html">8.8. Nagios</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-8.html">8.9. Misc</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-9a.html">8.10. Recommended Memory Configurations for the MapReduce Service</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap3-8.html">9. Review</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-9.html">10. Install, Start and Test</a></span></li><li tabind
 ex="2"><span class="file"><a href="ambari-chap3-10.html">11. Summary</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5.html">4. Troubleshooting Ambari Deployments</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-1.html">1. Getting the Logs</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap5-2.html">2. Quick Checks</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3.html">3. Specific Issues</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-a.html">3.1. Problem: Browser crashed before Install Wizard completed</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-a.html#ambari-chap5-3-a-1">3.1.1. Solution</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-b.html">3.2. Problem: Install Wizard reports that the cluster install has failed</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-cha
 p5-3-b.html#ambari-chap5-3-b-1">3.2.1. Solution</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-1.html">3.3. Problem: “Unable to create new native thread” exceptions in HDFS DataNode logs or those of any system daemon</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-1.html#ambari-chap5-3-1-1">3.3.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-2.html">3.4. Problem: The “yum install ambari-server” Command Fails</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-2.html#ambari-chap5-3-2-1">3.4.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-3.html">3.5. Problem: HDFS Smoke Test Fails</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-3.html#ambari-chap5-3-3-1">3.5.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="chap5-3-
 4.html">3.6. Problem: The HCatalog Daemon Metastore Smoke Test Fails</a></span><ul><li tabindex="2"><span class="file"><a href="chap5-3-4.html#chap5-3-4-1">3.6.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-5.html">3.7. Problem: MySQL and Nagios fail to install on RightScale CentOS 5 images on EC2 </a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-5.html#ambari-chap5.3.5.1">3.7.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-7.html">3.8. Problem: Trouble starting Ambari on system reboot</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-7.html#ambari-chap5-3-7-1">3.8.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-8.html">3.9. Problem: Metrics and Host information display incorrectly in Ambari Web</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-8.html#amb
 ari-chap5-3-8-1">3.9.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-9.html">3.10. Problem: On SUSE 11 Ambari Agent crashes within the first 24 hours</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-9.html#ambari-chap5-3-9-1">3.10.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-10.html">3.11. Problem: Attempting to Start HBase REST server causes either REST server or Ambari Web to fail</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-10.html#ambari-chap5-3-10-1">3.11.1. Solution</a></span></li></ul></li></ul></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap6.html">5. Appendix: Installing Ambari Agents Manually</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap6-1.html">1. RHEL/CentOS v. 5.x and 6.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap6-2.html">2. SLES<
 /a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap7a.html">6. Appendix: Using Custom Hostnames</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap7.html">7. Appendix: Upgrading Ambari Server from 1.2.0 to 1.2.1</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap8.html">8. Appendix: Upgrading Operating Systems on an Ambari-based Hadoop Installation</a></span></li></ul></div></div><div id="searchDiv"><div id="search"><form onsubmit="Verifie(ditaSearch_Form);return false" name="ditaSearch_Form" class="searchForm"><fieldset class="searchFieldSet"><legend>Search</legend><center><input id="textToSearch" name="textToSearch" type="text" class="searchText"/> &nbsp; <input onclick="Verifie(ditaSearch_Form)" type="button" class="searchButton" value="Go" id="doSearch"/></center></fieldset></form></div><div id="searchResults"><center/></div><p class="searchHighlight"><a href="#" onclick="toggleHighlight()">Search High
 lighter (On/Off)</a></p></div></div></div></div><script type="text/javascript" src="../common/jquery/jquery.qtip-1.0.0-rc3/jquery.qtip-1.0.0-rc3.min.js"><!--jQuery plugin for glossary popups. -->
+                   $('a[title]').qtip({ style: { name: 'cream', tip: true } })
+                </script></body></html>

Added: incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-7-1.html
URL: http://svn.apache.org/viewvc/incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-7-1.html?rev=1444637&view=auto
==============================================================================
--- incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-7-1.html (added)
+++ incubator/ambari/site/1.2.1/installing-hadoop-using-ambari/content/ambari-chap3-7-1.html Mon Feb 11 00:28:28 2013
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE html
+  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:exsl="http://exslt.org/common" xmlns:ng="http://docbook.org/docbook-ng" xmlns:fb="http://ogp.me/ns/fb#"><head>
+<meta http-equiv="X-UA-Compatible" content="IE=7"/>
+<title>8.1. HDFS - Apache Ambari
+    </title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="mavenGroupId" content="ambari.docs"/><meta name="mavenArtifactId" content="Ambari"/><meta name="mavenVersionId" content="1.2.0"/><link rel="home" href="index.html" title="Apache Ambari"/><link rel="up" href="ambari-chap3-7.html" title="8. Customize Services"/><link rel="prev" href="ambari-chap3-7.html" title="8. Customize Services"/><link rel="next" href="ambari-chap3-7-2.html" title="8.2. MapReduce"/><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><script type="text/javascript">
+            //The id for tree cookie
+            var treeCookieId = "treeview-3955";
+            var language = "en";
+            var w = new Object();
+            //Localization
+            txt_filesfound = 'Results';
+            txt_enter_at_least_1_char = "You must enter at least one character.";
+            txt_browser_not_supported = "Your browser is not supported. Use of Mozilla Firefox is recommended.";
+            txt_please_wait = "Please wait. Search in progress...";
+            txt_results_for = "Results for: ";
+        </script><style type="text/css">
+            input {
+            margin-bottom: 5px;
+            margin-top: 2px;
+            }
+
+            .folder {
+            display: block;
+            height: 22px;
+            padding-left: 20px;
+            background: transparent url(../common/jquery/treeview/images/folder.gif) 0 0px no-repeat;
+            }
+            
+        </style><link rel="shortcut icon" href="../favicon.ico" type="image/x-icon"/><link rel="stylesheet" type="text/css" href="../common/css/positioning.css"/><link rel="stylesheet" type="text/css" href="../common/css/custom.css"/><!--[if IE]>
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+	<![endif]--><link rel="stylesheet" type="text/css" href="../common/jquery/theme-redmond/jquery-ui-1.8.2.custom.css"/><link rel="stylesheet" type="text/css" href="../common/jquery/treeview/jquery.treeview.css"/><script type="text/javascript" src="../common/jquery/jquery-1.4.3.min.js"><!----></script><script type="text/javascript" src="../common/jquery/jquery-ui-1.8.2.custom.min.js"><!----></script><script type="text/javascript" src="../common/jquery/jquery.cookie.js"><!----></script><script type="text/javascript" src="../common/jquery/treeview/jquery.treeview.min.js"><!----></script><script type="text/javascript" src="../common/jquery/jquery.qtip-1.0.0-rc3/jquery.qtip-1.0.0-rc3.min.js"><!--jQuery plugin for glossary popups. --></script><script type="text/javascript" src="search/htmlFileList.js"><!----></script><script type="text/javascript" src="search/htmlFileInfoList.js"><!----></script><script type="text/javascript" src="search/nwSearchFnt.js"><!----></script><script type
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+NameMode, DataNodes, and some general and advanced properties. Click the name of the group to expand
+and collapse the display.</p><div class="table"><a id="d6e822"> </a><p class="title"><strong>Table 3.1. HDFS Settings:NameNode</strong></p><div class="table-contents"><table summary="HDFS Settings:NameNode" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left">NameNode host</td><td align="left">This value is prepopulated based on your choices on previous screens.  The host that has been
+assigned to run NameNode.</td></tr><tr><td align="left">NameNode directories</td><td align="left"> NameNode directories for HDFS to store the file system image. </td></tr><tr><td align="left">NameNode Java heap size</td><td align="left"> Initial and maximum Java heap size for NameNode (Java options -Xms and -Xmx) </td></tr><tr><td align="left">NameNode new generation size</td><td align="left">Default size of Java new generation for NameNode (Java option -XX:NewSize)
+<span class="bold"><strong>Note</strong></span>: The value of NameNode new generation size (default size of
+Java new generation for NameNode (Java option -XX:NewSize)) should be 1/8 of maximum heap size
+(-Xmx). Ensure that the value of the namenode_opt_newsize property is 1/8 the value of maximum heap
+size (-Xmx).</td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e843"> </a><p class="title"><strong>Table 3.2. HDFS Settings:SNameNode</strong></p><div class="table-contents"><table summary="HDFS Settings:SNameNode" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left">SNameNode host</td><td align="left">This value is prepopulated based on your choices on previous screens. The host that has been
+assigned to run the SecondaryNameNode.</td></tr><tr><td align="left">Secondary NameNode Checkpoint Directory</td><td align="left"> Directory on the local filesystem where the SecondaryNameNode should store the temporary
+images to merge </td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e857"> </a><p class="title"><strong>Table 3.3. HDFS Settings:DataNodes</strong></p><div class="table-contents"><table summary="HDFS Settings:DataNodes" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left">DataNode hosts</td><td align="left">The hosts that have been assigned to run DataNode</td></tr><tr><td align="left">DataNode directories</td><td align="left">DataNode directories for HDFS to store the data blocks</td></tr><tr><td align="left">DataNode maximum Java heap size</td><td align="left">Maximum Java heap size for DataNode (Java option -Xmx) </td></tr><tr><td align="left">DataNode volumes failure toleration </td><td align="left">The number of volumes that are allowed to fail before a DataNode stops offering services.
+</td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e877"> </a><p class="title"><strong>Table 3.4. HDFS Settings:General</strong></p><div class="table-contents"><table summary="HDFS Settings:General" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left">WebHDFS enabled</td><td align="left"> Check to enable WebHDFS</td></tr><tr><td align="left">Hadoop maximum Java heap size </td><td align="left"> Maximum Java heap size for daemons such as Balancer (Java option -Xmx) <sup>[<a id="d6e891" href="#ftn.d6e891" class="footnote">a</a>]</sup>  </td></tr><tr><td align="left">Reserved space for HDFS</td><td align="left">Reserved space in GB per volume for HDFS</td></tr><tr><td align="left">HDFS Maximum Checkpoint Delay</td><td align="left">Maximum delay between two consecutive checkpoints for HDFS</td></tr><tr><td align="left">HDFS Maximu
 m Edit Log Size for Checkpointing </td><td align="left"> Maximum size of the edits log file that forces an urgent checkpoint even if the maximum
+checkpoint delay is not reached </td></tr></tbody><tbody class="footnotes"><tr><td colspan="2"><div class="footnote"><p><sup>[<a id="ftn.d6e891" href="#d6e891" class="para">a</a>] </sup>The default value for this property is 1 GB. This value may need to be reduced for a VM-based
+installation. On the other hand, for significant work using Hive Server, 2GB is a more realistic
+value.</p></div></td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e902"> </a><p class="title"><strong>Table 3.5. HDFS Settings:Advanced</strong></p><div class="table-contents"><table summary="HDFS Settings:Advanced" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left">Hadoop Log Dir Prefix</td><td align="left">The parent directory for Hadoop log files.  The HDFS log directory will be
+${hadoop_log_dir_prefix}/${hdfs_user} and the MapReduce log directory will be
+${hadoop_log_dir_prefix}/${mapred_user}</td></tr><tr><td align="left">Hadoop PID Dir Prefix</td><td align="left"> The parent directory in which the PID files for Hadoop processes will be created. The HDFS
+PID directory will be ${hadoop_pid_dir_prefix}/${hdfs_user} and the MapReduce PID directory will be
+${hadoop_pid_dir_prefix}/${mapred_user} </td></tr><tr><td align="left">Exclude hosts</td><td align="left">Names a file that contains a list of hosts that are not permitted to connect to the NameNode.
+This file will be placed inside the Hadoop conf directory.  </td></tr><tr><td align="left">Include hosts</td><td align="left">Names a file that contains a list of hosts that are permitted to connect to the NameNode.
+This file will be placed inside the Hadoop conf directory.</td></tr><tr><td align="left">Block replication</td><td align="left">Default block replication</td></tr><tr><td align="left">dfs.block.local-path-access.user</td><td align="left">The user who is allowed to perform short-circuit reads</td></tr><tr><td align="left">dfs.datanode.socket.write.timeout</td><td align="left">DFS client write socket timeout</td></tr><tr><td align="left"> dfs.replication.max </td><td align="left">Maximal block replication</td></tr><tr><td align="left"> dfs.heartbeat.interval </td><td align="left">DataNode heartbeat interval in seconds</td></tr><tr><td align="left"> dfs.safemode.threshold.pct </td><td align="left">The percentage of blocks that should satisfy the minimal replication requirement set by
+dfs.replication.min.  Values less than or equal to 0 mean not to start in safe mode.  Values greater
+than 1 make safe mode permanent.</td></tr><tr><td align="left"> dfs.balance.bandwidthPerSec </td><td align="left">The maximum amount of bandwidth that each DataNode can utilize for balancing purposes in
+terms of the number of bytes per second</td></tr><tr><td align="left"> dfs.block.size </td><td align="left">Default block size for new files</td></tr><tr><td align="left"> dfs.datanode.ipc.address </td><td align="left">The DataNode IPC server address and port.  If the port is 0 the server starts on a free
+port.</td></tr><tr><td align="left"> dfs.blockreport.initialDelay </td><td align="left">Delay for first block report in seconds</td></tr><tr><td align="left"> dfs.datanode.du.pct </td><td align="left">The percentage of real available space to use when calculating remaining space</td></tr><tr><td align="left"> dfs.namenode.handler.count </td><td align="left">The number of server threads for the NameNode</td></tr><tr><td align="left"> dfs.datanode.max.xcievers </td><td align="left">PRIVATE CONFIG VARIABLE</td></tr><tr><td align="left"> dfs.umaskmode </td><td align="left">The octal umask used in creating files and directories</td></tr><tr><td align="left"> dfs.web.ugi </td><td align="left">The user account used by the web interface. Syntax: USERNAME, GROUP1, GROUP2 ....</td></tr><tr><td align="left"> dfs.permissions </td><td align="left">If <code class="literal">true</code>, enable permissions checking in HDFS.  If <code class="literal">false</code>, permission
+checking is turned off, but all other behavior stays unchanged.  Switching from one value to the
+other does not change the mode, owner, or group of files or directories.</td></tr><tr><td align="left"> dfs.permissions.supergroup </td><td align="left">The name of the group of superusers</td></tr><tr><td align="left"> ipc.server.max.response.size </td><td align="left"> </td></tr><tr><td align="left"> dfs.block.access.token.enable </td><td align="left">If <code class="literal">true</code> access tokens are required to access DataNodes. If
+<code class="literal">false</code> access tokens are not checked.</td></tr><tr><td align="left"> dfs.secondary.https.port </td><td align="left">The https port where the SecondaryNameNode binds</td></tr><tr><td align="left"> dfs.https.port </td><td align="left">The https port where the NameNode binds</td></tr><tr><td align="left"> dfs.access.time.precision </td><td align="left">The access time for  HDFS file is precise to this value. The default value is 1 hour.  A
+value of 0 disables access times for HDFS.</td></tr><tr><td align="left"> dfs.cluster.administrators </td><td align="left">ACL for all who can view the default servlets in HDFS</td></tr><tr><td align="left"> ipc.server.read.threadpool.size </td><td align="left"> </td></tr><tr><td align="left">io.file.buffer.size</td><td align="left">The size of bugger for use in sequence files.  The size of this bugger should probably be a
+multiple of hardware page size (4096 on Intel x86).  This value determines how much data is buffered
+during read and write operations.</td></tr><tr><td align="left">io.serializations</td><td align="left"> </td></tr><tr><td align="left">io.compression.codec.lzo.class</td><td align="left">The implementation class for the LZO codec.</td></tr><tr><td align="left">fs.trash.interval</td><td align="left">Number of minutes between trash checkpoints. If zero, the trash feature is disabled.</td></tr><tr><td align="left">ipc.client.idlethreshold</td><td align="left">The threshold number of connections after which connections are inspected for
+idleness</td></tr><tr><td align="left">ipc.client.connection.maxidletime</td><td align="left">Maximum time after which the client brings down the connection to the server</td></tr><tr><td align="left">ipc.client.connect.max.retries</td><td align="left">Maximum number of retries for IPC connections</td></tr><tr><td align="left">webinterface.private.actions</td><td align="left">If true, the native web interfaces for JT and NN may contain actions, such as kill job,
+delete file, etc. that should not be exposed to the public.  Enable this option if these interfaces
+are reachable only by appropriately authorized users.</td></tr><tr><td align="left">Custom Hadoop Configs</td><td align="left">Use this text box to enter values for core-site.xml properties not exposed by the UI. Enter
+in "key=value" format, with a newline as a delimiter between pairs.</td></tr><tr><td align="left">Custom HDFS Configs</td><td align="left">Use this text box to enter values for hdfs-site.xml properties not exposed by the UI. Enter
+in "key=value" format, with a newline as a delimiter between pairs.</td></tr></tbody></table></div></div><br class="table-break"/></div><script type="text/javascript" src="../common/main.js"><!----></script><hr/><div class="legal"><a href="index.html">Index</a></div></div><div><div id="leftnavigation" style="padding-top:3px; background-color:white;"><div id="tabs"><ul><li><a href="#treeDiv" tabindex="1"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv" tabindex="1"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="../common/images/loading.gif" alt="loading table of contents..." id="tocLoading" style="display:block;"/><div id="ulTreeDiv" style="display:none" class="thisisthat"><ul id="tree" class="filetree"><li tabindex="2"><span class="file"><a href="ambari-chap1.html">1. Getting Ready to Install</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-1.html">1. Understand the Basics</a></span></li><li tab
 index="2"><span class="file"><a href="ambari-chap1-2.html">2. Meet Minimum System Requirements</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-1">2.1. Hardware Recommendations</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-2">2.2. Operating Systems Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-3">2.3. Browser Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-4">2.4. Software Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-5">2.5. Database Requirements</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap1-3.html">3. Decide on Deployment Type</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-4.html">4. Collect Information</a></span></li><li tabindex="2"><sp
 an class="file"><a href="ambari-chap1-5.html">5. Prepare the Environment</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-5-1.html">5.1. Check Existing Installs</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-2.html">5.2. Set Up Password-less SSH</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-3.html">5.3. Enable NTP on the Cluster and on the Browser Host</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-4.html">5.4. Check DNS</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-5.html">5.5. Disable SELinux</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-6.html">5.6. Disable iptables</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap1-6.html">6. Optional: Configure the Local Repositories</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2.html">2. Running the Instal
 ler</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2-1.html">1. Set Up the Bits</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2.1.1.html">1.1. RHEL/CentOS 5.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2.1.2.html">1.2. RHEL/CentOS 6.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2.1.3.html">1.3. SLES 11</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2-2.html">2. Set Up the  Server</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2-2-1.html">2.1. Setup Options</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2-4.html">3. Optional: Set Up LDAP Authentication</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2-3.html">4. Start the Ambari Server</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap3.html">3. Installing, Configuring, and Deploying
  the Cluster</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap3-1.html">1. Log into Apache Ambari</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-2.html">2. Welcome</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-3.html">3. Install Options</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-4.html">4. Confirm Hosts</a></span></li><li tabindex="2"><span class="file"><a href="ch03s05.html">5. Choose Services</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-5.html">6. Assign Masters</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-6.html">7. Assign Slaves and Clients</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7.html">8. Customize Services</a></span><ul><li tabindex="2" id="webhelp-currentid"><span class="file"><a href="ambari-chap3-7-1.html">8.1. HDFS</a></span></li><li tabindex="2"><span class="file"><a href="
 ambari-chap3-7-2.html">8.2. MapReduce</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-3.html">8.3. Hive/HCat </a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-4.html">8.4. WebHCat</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-5.html">8.5. HBase</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-6.html">8.6. ZooKeeper</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-7.html">8.7. Oozie</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-9.html">8.8. Nagios</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-8.html">8.9. Misc</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-9a.html">8.10. Recommended Memory Configurations for the MapReduce Service</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap3-8.html">9. Review</a></span></li><li tabindex="2"
 ><span class="file"><a href="ambari-chap3-9.html">10. Install, Start and Test</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-10.html">11. Summary</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5.html">4. Troubleshooting Ambari Deployments</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-1.html">1. Getting the Logs</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap5-2.html">2. Quick Checks</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3.html">3. Specific Issues</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-a.html">3.1. Problem: Browser crashed before Install Wizard completed</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-a.html#ambari-chap5-3-a-1">3.1.1. Solution</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-b.html">3.2. Problem: Install Wizard reports th
 at the cluster install has failed</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-b.html#ambari-chap5-3-b-1">3.2.1. Solution</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-1.html">3.3. Problem: “Unable to create new native thread” exceptions in HDFS DataNode logs or those of any system daemon</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-1.html#ambari-chap5-3-1-1">3.3.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-2.html">3.4. Problem: The “yum install ambari-server” Command Fails</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-2.html#ambari-chap5-3-2-1">3.4.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-3.html">3.5. Problem: HDFS Smoke Test Fails</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-3.html#ambari-chap5
 -3-3-1">3.5.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="chap5-3-4.html">3.6. Problem: The HCatalog Daemon Metastore Smoke Test Fails</a></span><ul><li tabindex="2"><span class="file"><a href="chap5-3-4.html#chap5-3-4-1">3.6.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-5.html">3.7. Problem: MySQL and Nagios fail to install on RightScale CentOS 5 images on EC2 </a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-5.html#ambari-chap5.3.5.1">3.7.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-7.html">3.8. Problem: Trouble starting Ambari on system reboot</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-7.html#ambari-chap5-3-7-1">3.8.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-8.html">3.9. Problem: Metrics and Host information display incorre
 ctly in Ambari Web</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-8.html#ambari-chap5-3-8-1">3.9.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-9.html">3.10. Problem: On SUSE 11 Ambari Agent crashes within the first 24 hours</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-9.html#ambari-chap5-3-9-1">3.10.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-10.html">3.11. Problem: Attempting to Start HBase REST server causes either REST server or Ambari Web to fail</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-10.html#ambari-chap5-3-10-1">3.11.1. Solution</a></span></li></ul></li></ul></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap6.html">5. Appendix: Installing Ambari Agents Manually</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap6-1.html">1. RHEL/CentOS v
 . 5.x and 6.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap6-2.html">2. SLES</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap7a.html">6. Appendix: Using Custom Hostnames</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap7.html">7. Appendix: Upgrading Ambari Server from 1.2.0 to 1.2.1</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap8.html">8. Appendix: Upgrading Operating Systems on an Ambari-based Hadoop Installation</a></span></li></ul></div></div><div id="searchDiv"><div id="search"><form onsubmit="Verifie(ditaSearch_Form);return false" name="ditaSearch_Form" class="searchForm"><fieldset class="searchFieldSet"><legend>Search</legend><center><input id="textToSearch" name="textToSearch" type="text" class="searchText"/> &nbsp; <input onclick="Verifie(ditaSearch_Form)" type="button" class="searchButton" value="Go" id="doSearch"/></center></fieldset></form></div><div id="searc
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+                                    <a accesskey="n" class="navLinkNext" onclick="_gaq.push(['_trackEvent', 'Header', 'nextLink', 'click', 1]);" tabindex="5" href="ambari-chap3-7-3.html">Next</a></td></tr></table></div></div><div id="toolbar" class="ui-tabs-nav ui-helper-reset ui-helper-clearfix ui-widget-header ui-corner-all"><div id="toolbar-left"><p class="breadcrumbs"><a href="http://incubator.apache.org/ambari">Ambari Project Website</a><a href="index.html">Ambari User Guide</a></p></div></div><div id="content"><div class="statustext"> </div><div class="section"><div xmlns="" class="titlepage"><div><div><h3 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="ambari-chap3-7-2"> </a>8.2. MapReduce</h3></div></div></div><p>This tab covers MapReduce settings. Here you can set properties for the JobTracker and
+TaskTrackers, as well as some general and advanced properties. Click the name of the group to expand
+and collapse the display</p><div class="table"><a id="d6e1031"> </a><p class="title"><strong>Table 3.6. MapReduce Settings: JobTracker</strong></p><div class="table-contents"><table summary="MapReduce Settings: JobTracker" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left"><p>JobTracker host</p></td><td align="left"><p>This value is prepopulated based on your choices on previous screens.  The host that has been
+assigned to run JobTracker.</p></td></tr><tr><td align="left"><p>JobTracker new generation size</p></td><td align="left"><p>Default size of Java new generation size for JobTracker (Java option -XX:NewSize) </p></td></tr><tr><td align="left"><p><a id="backlink2"> </a>JobTracker maximum new generation size</p></td><td align="left"><p>Maximum size of Java new generation for Job­Tracker (Java option -XX:MaxNewSize) </p></td></tr><tr><td align="left"><p><a id="backlink3"> </a>JobTracker maximum Java heap size</p></td><td align="left"><p>Maximum Java heap size for JobTracker in MB (Java option -Xmx) </p></td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e1059"> </a><p class="title"><strong>Table 3.7. MapReduce Settings: TaskTracker</strong></p><div class="table-contents"><table summary="MapReduce Settings: TaskTracker" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Note
 s</th></tr></thead><tbody><tr><td align="left">TaskTracker hosts</td><td align="left">This value is prepopulated based on your choices on previous screens.  The hosts that have
+been assigned to run TaskTrackers.</td></tr><tr><td align="left">MapReduce local directories</td><td align="left">Directories for MapReduce to store intermediate data files</td></tr><tr><td align="left">Number of Map slots per node</td><td align="left"> Number of slots that Map tasks that run simultaneously can occupy on a TaskTracker </td></tr><tr><td align="left"> Number of Reduce slots per node </td><td align="left"> Number of slots that Reduce tasks that run simultaneously can occupy on a TaskTracker. </td></tr><tr><td align="left">Java options for MapReduce tasks</td><td align="left">Java options for the TaskTracker child processes</td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e1082"> </a><p class="title"><strong>Table 3.8. MapReduce Settings: General</strong></p><div class="table-contents"><table summary="MapReduce Settings: General" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><
 th align="center">Notes</th></tr></thead><tbody><tr><td align="left"> MapReduce Capacity Scheduler </td><td align="left">The scheduler to use for scheduling MapReduce jobs</td></tr><tr><td align="left"> Cluster's Map slot size (virtual memory) </td><td align="left"> The virtual memory size of a single Map slot in the MapReduce framework. Use -1 for no limit
+</td></tr><tr><td align="left"><p>Cluster's Reduce slot size (virtual memory)</p></td><td align="left"><p>The virtual memory size of a single Reduce slot in the MapReduce framework. Use -1 for no limit</p></td></tr><tr><td align="left"><p>Upper limit on virtual memory for single Map task</p></td><td align="left"><p>Upper limit on virtual memory for single Map task. Use -1 for no limit.</p></td></tr><tr><td align="left"><p>Upper limit on virtual memory for single Reduce task</p></td><td align="left"><p>Upper limit on virtual memory for single Reduce task. Use -1 for no limit.</p>
+</td></tr><tr><td align="left"><p>Default virtual memory for a job’s map-task </p></td><td align="left">Virtual memory for single Map task. Use -1 for no limit.
+</td></tr><tr><td align="left"> Default virtual memory for a job's reduce-task </td><td align="left">Virtual memory for single Reduce task. Use -1 for no limit. </td></tr><tr><td align="left"><p>Map-side sort buffer memory</p>
+</td><td align="left"><p>The total amount of Map-side buffer memory to use while sorting files (Expert-only configuration)
+</p></td></tr><tr><td align="left"><p>Limit on buffer</p>
+</td><td align="left"><p>Percentage of sort buffer used for record collection (Expert-only configuration)
+</p></td></tr><tr><td align="left"><p>Job log retention (hours)</p>
+</td><td align="left"><p>The maximum time, in hours, for which the user-logs are to be retained after the job completion.
+</p></td></tr><tr><td align="left"><p>Maximum number tasks for a Job</p>
+</td><td align="left"><p>Maximum number of tasks for a single Job. Use -1 for no limit.</p>
+</td></tr><tr><td align="left"><p>LZO compression</p>
+</td><td align="left"><p>Check to enable LZO compression in addition to Snappy</p>
+</td></tr><tr><td align="left">Snappy compression</td><td align="left">Check to enable Snappy compression</td></tr><tr><td align="left">Enable Job Diagnostics</td><td align="left">Check to enable tools for tracing the path and troubleshooting the performance of MapReduce
+jobs</td></tr></tbody></table></div></div><br class="table-break"/><div class="table"><a id="d6e1149"> </a><p class="title"><strong>Table 3.9. MapReduce Settings: Advanced</strong></p><div class="table-contents"><table summary="MapReduce Settings: Advanced" border="1"><colgroup><col/><col/></colgroup><thead><tr><th align="center">Name</th><th align="center">Notes</th></tr></thead><tbody><tr><td align="left">MapReduce system directories</td><td align="left">MapReduce system directories</td></tr><tr><td align="left"> </td><td align="left"> </td></tr><tr><td align="left"> io.sort.factor </td><td align="left"> </td></tr><tr><td align="left"> mapred.tasktracker.tasks.sleeptime-before-sigkill </td><td align="left">Normally this is the amount of time before killing processes, and  the recommended default is
+5.000 seconds, a value of 5000 here.  In this case it is used solely to blast tasks before killing
+them, and killing them very quickly (.25 second) to guarantee that we do not leave VMs around for
+later jobs</td></tr><tr><td align="left"> mapred.job.tracker.handler.count </td><td align="left">The number of server threads for the JobTracker.  Roughly 4% of the number of TaskTracker
+nodes.</td></tr><tr><td align="left"> mapreduce.cluster.administrators </td><td align="left"> </td></tr><tr><td align="left"> mapred.reduce.parallel.copies </td><td align="left"> </td></tr><tr><td align="left"> tasktracker.http.threads </td><td align="left"> </td></tr><tr><td align="left"> mapred.map.tasks.speculative.execution </td><td align="left">If <code class="literal">true</code>, then multiple instances of some map tasks may be executed in parallel</td></tr><tr><td align="left"> mapred.reduce.tasks.speculative.execution </td><td align="left">If <code class="literal">true</code>, then multiple instances of some reduce tasks may be executed in
+parallel</td></tr><tr><td align="left"> mapred.reduce.slowstart.completed.maps </td><td align="left"> </td></tr><tr><td align="left"> mapred.inmem.merge.threshold </td><td align="left">The threshold, in terms of the number of files, for triggering the in-memory merge process.
+When the threshold  is hit, we initiate the merge and spill to disk. A value of less than or equal
+to 0 means no threshold is set and ramfs's memory consumption triggers the merge.</td></tr><tr><td align="left"> mapred.job.shuffle.merge.percent </td><td align="left">The threshold, expressed as a percentage of the total memory allocated to storing in-memory
+map outputs (defined in <code class="literal">mapred.job.shuffle.input.buffer.percent</code>), for triggering the in-memory merge
+process.</td></tr><tr><td align="left"> mapred.job.shuffle.input.buffer.percent </td><td align="left">The percentage of memory to be allocated from the maximum heap size for storing map outputs
+during the shuffle.</td></tr><tr><td align="left"> mapred.output.compression.type </td><td align="left">If the job outputs are to be compressed as SequenceFiles, how should they be compressed?
+Acceptable values are: NONE, RECORD, or BLOCK.</td></tr><tr><td align="left"> mapred.jobtracker.completeuserjobs.maximum </td><td align="left"> </td></tr><tr><td align="left"> mapred.jobtracker.restart.recover </td><td align="left">A value of <code class="literal">true</code> enables job recovery on restart; <code class="literal">false</code> starts afresh</td></tr><tr><td align="left"> mapred.job.reduce.input.buffer.percent </td><td align="left">The percentage of memory relative to the maximum heap size.  When the shuffle is concluded,
+any remaining map outputs in memory must consume less than this threshold before the reduce can
+begin.</td></tr><tr><td align="left">mapreduce.reduce.input.limit</td><td align="left">The limit on the input size of the reduce.  If the estimated input size of the reduce is
+greater than this value, job is failed. A value of -1 means that no limit is set.</td></tr><tr><td align="left">mapred.task.timeout</td><td align="left">The number of milliseconds before a task will be  terminated if it neither reads an input,
+writes an output, or updates its status string.</td></tr><tr><td align="left">jetty.connector</td><td align="left"> </td></tr><tr><td align="left">mapred.child.root.logger </td><td align="left"> </td></tr><tr><td align="left">mapred.max.tracker.blacklists </td><td align="left">If a node is reported blacklisted by this number of successful jobs within the timeout
+window,  it will be graylisted.</td></tr><tr><td align="left"> mapred.healthChecker.interval </td><td align="left"> </td></tr><tr><td align="left"> mapred.healthChecker.script.timeout </td><td align="left"> </td></tr><tr><td align="left"> mapred.job.tracker.persist.jobstatus.active </td><td align="left">Indicates if persistency of job status is active or not</td></tr><tr><td align="left"> mapred.job.tracker.persist.jobstatus.hours </td><td align="left">The number of hours job status information is persisted in DFS.  Job status information is
+available after it drops off the memory queue and between JobTracker restarts. A value of zero means
+that job status information is not persisted at all.</td></tr><tr><td align="left"> mapred.jobtracker.retirejob.check </td><td align="left"> </td></tr><tr><td align="left"> mapred.jobtracker.retirejob.interval </td><td align="left"> </td></tr><tr><td align="left"> mapred.job.tracker.history.completed.location </td><td align="left"> </td></tr><tr><td align="left"> mapreduce.fileoutputcommitter.marksuccessfuljobs </td><td align="left"> </td></tr><tr><td align="left"> mapred.job.reuse.jvm.num.tasks </td><td align="left">The number of tasks to run per JVM. A value if -1 indicates no limit.</td></tr><tr><td align="left"> hadoop.job.history.user.location </td><td align="left"> </td></tr><tr><td align="left"> mapreduce.jobtracker.staging.root.dir </td><td align="left">The path prefix for the staging directories.  The next level is always the user's name.  It
+is a path in the default file system.</td></tr><tr><td align="left"> mapreduce.tasktracker.group </td><td align="left">The group that the TaskTracker controller uses for accessing the controller.  The mapred user
+<span class="italic">must</span> be a member and users should <span class="italic">not</span> be members.</td></tr><tr><td align="left"> mapreduce.jobtracker.split.metainfo.maxsize </td><td align="left">If the size of the split metainfo file is larger than this value, the JobTacker will fail the
+job during initialization.</td></tr><tr><td align="left"> mapred.jobtracker.blacklist.fault-timeout-window </td><td align="left">Sliding window in minutes</td></tr><tr><td align="left"> mapred.jobtracker.blacklist.fault-bucket-width.</td><td align="left">Bucket size in minutes.</td></tr><tr><td align="left"> mapred.queue.names </td><td align="left">Comma separated list of queues configured for this jobtracker</td></tr><tr><td align="left">Custom MapReduce Configs</td><td align="left">Use this text box to enter values for mapred-site.xml properties not exposed by the UI. Enter
+in "key=value" format, with a newline as a delimiter between pairs.</td></tr></tbody></table></div></div><br class="table-break"/></div><script type="text/javascript" src="../common/main.js"><!----></script><hr/><div class="legal"><a href="index.html">Index</a></div></div><div><div id="leftnavigation" style="padding-top:3px; background-color:white;"><div id="tabs"><ul><li><a href="#treeDiv" tabindex="1"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv" tabindex="1"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="../common/images/loading.gif" alt="loading table of contents..." id="tocLoading" style="display:block;"/><div id="ulTreeDiv" style="display:none" class="thisisthat"><ul id="tree" class="filetree"><li tabindex="2"><span class="file"><a href="ambari-chap1.html">1. Getting Ready to Install</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-1.html">1. Understand the Basics</a></span></li><li tab
 index="2"><span class="file"><a href="ambari-chap1-2.html">2. Meet Minimum System Requirements</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-1">2.1. Hardware Recommendations</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-2">2.2. Operating Systems Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-3">2.3. Browser Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-4">2.4. Software Requirements</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-2.html#ambari-chap1-2-5">2.5. Database Requirements</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap1-3.html">3. Decide on Deployment Type</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-4.html">4. Collect Information</a></span></li><li tabindex="2"><sp
 an class="file"><a href="ambari-chap1-5.html">5. Prepare the Environment</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap1-5-1.html">5.1. Check Existing Installs</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-2.html">5.2. Set Up Password-less SSH</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-3.html">5.3. Enable NTP on the Cluster and on the Browser Host</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-4.html">5.4. Check DNS</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-5.html">5.5. Disable SELinux</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap1-5-6.html">5.6. Disable iptables</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap1-6.html">6. Optional: Configure the Local Repositories</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2.html">2. Running the Instal
 ler</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2-1.html">1. Set Up the Bits</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2.1.1.html">1.1. RHEL/CentOS 5.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2.1.2.html">1.2. RHEL/CentOS 6.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2.1.3.html">1.3. SLES 11</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2-2.html">2. Set Up the  Server</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap2-2-1.html">2.1. Setup Options</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap2-4.html">3. Optional: Set Up LDAP Authentication</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap2-3.html">4. Start the Ambari Server</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap3.html">3. Installing, Configuring, and Deploying
  the Cluster</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap3-1.html">1. Log into Apache Ambari</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-2.html">2. Welcome</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-3.html">3. Install Options</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-4.html">4. Confirm Hosts</a></span></li><li tabindex="2"><span class="file"><a href="ch03s05.html">5. Choose Services</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-5.html">6. Assign Masters</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-6.html">7. Assign Slaves and Clients</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7.html">8. Customize Services</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap3-7-1.html">8.1. HDFS</a></span></li><li tabindex="2" id="webhelp-currentid"><span class="file"><a href="
 ambari-chap3-7-2.html">8.2. MapReduce</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-3.html">8.3. Hive/HCat </a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-4.html">8.4. WebHCat</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-5.html">8.5. HBase</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-6.html">8.6. ZooKeeper</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-7.html">8.7. Oozie</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-9.html">8.8. Nagios</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-8.html">8.9. Misc</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-7-9a.html">8.10. Recommended Memory Configurations for the MapReduce Service</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap3-8.html">9. Review</a></span></li><li tabindex="2"
 ><span class="file"><a href="ambari-chap3-9.html">10. Install, Start and Test</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap3-10.html">11. Summary</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5.html">4. Troubleshooting Ambari Deployments</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-1.html">1. Getting the Logs</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap5-2.html">2. Quick Checks</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3.html">3. Specific Issues</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-a.html">3.1. Problem: Browser crashed before Install Wizard completed</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-a.html#ambari-chap5-3-a-1">3.1.1. Solution</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-b.html">3.2. Problem: Install Wizard reports th
 at the cluster install has failed</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-b.html#ambari-chap5-3-b-1">3.2.1. Solution</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-1.html">3.3. Problem: “Unable to create new native thread” exceptions in HDFS DataNode logs or those of any system daemon</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-1.html#ambari-chap5-3-1-1">3.3.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-2.html">3.4. Problem: The “yum install ambari-server” Command Fails</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-2.html#ambari-chap5-3-2-1">3.4.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-3.html">3.5. Problem: HDFS Smoke Test Fails</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-3.html#ambari-chap5
 -3-3-1">3.5.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="chap5-3-4.html">3.6. Problem: The HCatalog Daemon Metastore Smoke Test Fails</a></span><ul><li tabindex="2"><span class="file"><a href="chap5-3-4.html#chap5-3-4-1">3.6.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-5.html">3.7. Problem: MySQL and Nagios fail to install on RightScale CentOS 5 images on EC2 </a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-5.html#ambari-chap5.3.5.1">3.7.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-7.html">3.8. Problem: Trouble starting Ambari on system reboot</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-7.html#ambari-chap5-3-7-1">3.8.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-8.html">3.9. Problem: Metrics and Host information display incorre
 ctly in Ambari Web</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-8.html#ambari-chap5-3-8-1">3.9.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-9.html">3.10. Problem: On SUSE 11 Ambari Agent crashes within the first 24 hours</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-9.html#ambari-chap5-3-9-1">3.10.1. Solution:</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap5-3-10.html">3.11. Problem: Attempting to Start HBase REST server causes either REST server or Ambari Web to fail</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap5-3-10.html#ambari-chap5-3-10-1">3.11.1. Solution</a></span></li></ul></li></ul></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap6.html">5. Appendix: Installing Ambari Agents Manually</a></span><ul><li tabindex="2"><span class="file"><a href="ambari-chap6-1.html">1. RHEL/CentOS v
 . 5.x and 6.x</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap6-2.html">2. SLES</a></span></li></ul></li><li tabindex="2"><span class="file"><a href="ambari-chap7a.html">6. Appendix: Using Custom Hostnames</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap7.html">7. Appendix: Upgrading Ambari Server from 1.2.0 to 1.2.1</a></span></li><li tabindex="2"><span class="file"><a href="ambari-chap8.html">8. Appendix: Upgrading Operating Systems on an Ambari-based Hadoop Installation</a></span></li></ul></div></div><div id="searchDiv"><div id="search"><form onsubmit="Verifie(ditaSearch_Form);return false" name="ditaSearch_Form" class="searchForm"><fieldset class="searchFieldSet"><legend>Search</legend><center><input id="textToSearch" name="textToSearch" type="text" class="searchText"/> &nbsp; <input onclick="Verifie(ditaSearch_Form)" type="button" class="searchButton" value="Go" id="doSearch"/></center></fieldset></form></div><div id="searc
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