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for all components of the Tajo system. TajoMaster failure prevents clients from submitting new queries to the cluster, and results in the disruption of the ability to run insert overwrite queries because the TajoWorker canât apply its statistical information to CatalogStore. Therefore, the high-availability (HA) of TajoMaster is essential for the high-availability of Tajo generally.</p> +<p>Currently, TajoMaster HA provides the following elements:</p> +<ul class="simple"> +<li>Automatic failover of TajoMaster: Even if the active TajoMaster stops, the standby TajoMaster will become the active node.</li> +<li>Preservation of the ongoing query in the cluster: Even if the active TajoMaster stops, the ongoing query will still complete in the cluster.</li> +</ul> +<div class="section" id="terminology"> +<h2>Terminology<a class="headerlink" href="#terminology" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li>Active master: TajoMaster that is actively serving the all operation from TajoClient and TajoWorker.</li> +<li>Backup master: This TajoMaster waits becomes active when the Active dies or unhealthy. Users can setup multiple back TajoMaster, and this servers monitors the Active status to become active.</li> +</ul> +</div> +<div class="section" id="configuration-file-settings"> +<h2>Configuration File Settings<a class="headerlink" href="#configuration-file-settings" title="Permalink to this headline">¶</a></h2> +<p>If you want to use TajoMaster HA mode, specific your <tt class="docutils literal"><span class="pre">tajo.master.ha.enable</span></tt> as follows:</p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.master.ha.enable<span class="nt"></name></span> + <span class="nt"><value></span>true<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +<p>If you use HA mode, all back masters monitor the active master at 5 second intervals. If you update this period, specific your <tt class="docutils literal"><span class="pre">tajo.master.ha.monitor.interval</span></tt> as follows:</p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.master.ha.monitor.interval<span class="nt"></name></span> + <span class="nt"><value></span>monitor interval<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +</div> +<div class="section" id="backup-master-settings"> +<h2>Backup Master Settings<a class="headerlink" href="#backup-master-settings" title="Permalink to this headline">¶</a></h2> +<p>If you want to run masters with <tt class="docutils literal"><span class="pre">start-tajo.sh</span></tt>, specific your masters in <tt class="docutils literal"><span class="pre">conf/masters</span></tt>. The file lists all host names of masters, one per line.By default, this file contains the single entry <tt class="docutils literal"><span class="pre">localhost</span></tt>. You can easily add host names of workers via your favorite text editor.</p> +<p>For example:</p> +<div class="highlight-python"><div class="highlight"><pre>$ cat > conf/masters +host1.domain.com +host2.domain.com +.... + +<ctrl + d> +</pre></div> +</div> +<p>And then, you need to setup tarball and set configuration files on backup masters.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p>If you want to run active master and backup master on the same host, you may find TajoMaster port conflicts. To avoid this problem, you must convert backup master primary ports to another port in <tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt> as follows:</p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.master.umbilical-rpc.address<span class="nt"></name></span> + <span class="nt"><value></span>localhost:36001<span class="nt"></value></span> + <span class="nt"><description></span>The default port is 26001.<span class="nt"></description></span> +<span class="nt"></property></span> + +<span class="nt"><property></span> + <span class="nt"><name></span>tajo.master.client-rpc.address<span class="nt"></name></span> + <span class="nt"><value></span>localhost:36002<span class="nt"></value></span> + <span class="nt"><description></span>The default port is 26002.<span class="nt"></description></span> +<span class="nt"></property></span> + +<span class="nt"><property></span> + <span class="nt"><name></span>tajo.resource-tracker.rpc.address<span class="nt"></name></span> + <span class="nt"><value></span>localhost:36003<span class="nt"></value></span> + <span class="nt"><description></span>The default port is 26003.<span class="nt"></description></span> + <span class="nt"></property></span> + +<span class="nt"><property></span> + <span class="nt"><name></span>tajo.catalog.client-rpc.address<span class="nt"></name></span> + <span class="nt"><value></span>localhost:36005<span class="nt"></value></span> + <span class="nt"><description></span>The default port is 26005.<span class="nt"></description></span> +<span class="nt"></property></span> + +<span class="nt"><property></span> + <span class="nt"><name></span>tajo.master.info-http.address<span class="nt"></name></span> + <span class="nt"><value></span>0.0.0.0:36080<span class="nt"></value></span> + <span class="nt"><description></span>The default port is 26080.<span class="nt"></description></span> +<span class="nt"></property></span> +</pre></div> +</div> +<p class="last">And you need to convert <tt class="docutils literal"><span class="pre">TAJO_PID_DIR</span></tt> to another directory in <tt class="docutils literal"><span class="pre">tajo-env.sh</span></tt>.</p> +</div> +</div> +<div class="section" id="launch-a-tajo-cluster"> +<h2>Launch a Tajo cluster<a class="headerlink" href="#launch-a-tajo-cluster" title="Permalink to this headline">¶</a></h2> +<p>Then, execute <tt class="docutils literal"><span class="pre">start-tajo.sh</span></tt></p> +<div class="highlight-python"><div class="highlight"><pre>$ $TAJO_HOME/bin/start-tajo.sh +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">You can’t use HA mode in DerbyStore. Currently, just one TajoMaster invoke the derby. If another master try to invoke it, it never run itself. Also, if you set another catalog uri for backup master, it is a incorrect configuration. Because they are unequal in every way.</p> +</div> +</div> +<div class="section" id="administration-ha-state"> +<h2>Administration HA state<a class="headerlink" href="#administration-ha-state" title="Permalink to this headline">¶</a></h2> +<p>If you want to transit any backup master to active master, execute <tt class="docutils literal"><span class="pre">tajo</span> <span class="pre">hadmin</span> <span class="pre">-transitionToActive</span></tt></p> +<div class="highlight-python"><div class="highlight"><pre>$ $TAJO_HOME/bin/tajo haadmin -transitionToActive <target tajo.master.umbilical-rpc.address> +</pre></div> +</div> +<p>If you want to transit any active master to backup master, execute <tt class="docutils literal"><span class="pre">tajo</span> <span class="pre">hadmin</span> <span class="pre">-transitionToBackup</span></tt></p> +<div class="highlight-python"><div class="highlight"><pre>$ $TAJO_HOME/bin/tajo haadmin -transitionToBackup <target tajo.master.umbilical-rpc.address> +</pre></div> +</div> +<p>If you want to find the state of any master, execute <tt class="docutils literal"><span class="pre">tajo</span> <span class="pre">hadmin</span> <span class="pre">-getState</span></tt></p> +<div class="highlight-python"><div class="highlight"><pre>$ $TAJO_HOME/bin/tajo haadmin -getState <target tajo.master.umbilical-rpc.address> +</pre></div> +</div> +<p>If you want to initiate HA information, execute <tt class="docutils literal"><span class="pre">tajo</span> <span class="pre">haadmin</span> <span class="pre">-formatHA</span></tt></p> +<div class="highlight-python"><div class="highlight"><pre>$ $TAJO_HOME/bin/tajo haadmin -formatHA +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Before format HA, you must shutdown the Tajo cluster.</p> +</div> +</div> +<div class="section" id="how-to-test-automatic-failover"> +<h2>How to Test Automatic Failover<a class="headerlink" href="#how-to-test-automatic-failover" title="Permalink to this headline">¶</a></h2> +<p>If you want to verify automatic failover of TajoMaster, you must deploy your Tajo cluster with TajoMaster HA enable. And then, you need to find which node is active from Tajo web UI.</p> +<p>Once you find your active TajoMaster, you can cause a failure on that node. For example, you can use kill -9 <pid of TajoMaster> to simulate a JVM crash. Or you can shutdown the machine or disconnect network interface. And then, the backup TajoMaster will be automatically active within 5 seconds. The amount of time required to detect a failure and trigger a failover depends on the config <tt class="docutils literal"><span class="pre">tajo.master.ha.monitor.interval</span></tt>. If there is running queries, it will be finished successfully. Because your TajoClient will get the result data on TajoWorker. But you can’t find already query history. Because TajoMaster stores query history on memory. So, the other master can’t access already active master query history. And if there is no running query, the automatic failover run successfully.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">TajoMaster HA does not consider TajoWorker failure. It guarantees the high availability of both TajoResourceManager and QueryMaster.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="../tsql.html" class="btn btn-neutral float-right" title="Tajo Shell (TSQL)"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="configuration_defaults.html" class="btn btn-neutral" title="Configuration Defaults"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'0.8.0', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: true + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html> \ No newline at end of file
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+</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../sql_language.html">SQL Language</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/data_model.html">Data Model</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/ddl.html">Data Definition Language</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/insert.html">INSERT (OVERWRITE) INTO</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/queries.html">Queries</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/sql_expression.html">SQL Expressions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/predicates.html">Predicates</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../functions.html">Functions</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../functions/math_func_and_operators.html">Math Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/string_func_and_operators.html">String Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/datetime_func_and_operators.html">DateTime Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/network_func_and_operators.html">Network Functions and Operators</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../table_management.html">Table Management</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../table_management/file_formats.html">File Formats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../table_management/compression.html">Compression</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../table_partitioning.html">Table Partitioning</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/intro_to_partitioning.html">Introduction to Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/column_partitioning.html">Column Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/range_partitioning.html">Range Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/hash_partitioning.html">Hash Partitioning</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../backup_and_restore.html">Backup and Restore</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../backup_and_restore/catalog.html">Backup and Restore Catalog</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../hcatalog_integration.html">HCatalog Integration</a></li> +<li class="toctree-l1"><a class="reference internal" href="../jdbc_driver.html">Tajo JDBC Driver</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#how-to-get-jdbc-driver">How to get JDBC driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#setting-the-classpath">Setting the CLASSPATH</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#faq">FAQ</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tajo_client_api.html">Tajo Client API</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li> +</ul> + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Apache Tajo</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../configuration.html">Configuration</a> »</li> + + <li>Preliminary</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/configuration/preliminary.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="preliminary"> +<h1>Preliminary<a class="headerlink" href="#preliminary" title="Permalink to this headline">¶</a></h1> +<div class="section" id="catalog-site-xml-and-tajo-site-xml"> +<h2>catalog-site.xml and tajo-site.xml<a class="headerlink" href="#catalog-site-xml-and-tajo-site-xml" title="Permalink to this headline">¶</a></h2> +<p>Tajo’s configuration is based on Hadoop’s configuration system. Tajo uses two config files:</p> +<ul class="simple"> +<li>catalog-site.xml - configuration for the catalog server.</li> +<li>tajo-site.xml - configuration for other tajo modules.</li> +</ul> +<p>Each config consists of a pair of a name and a value. If you want to set the config name <tt class="docutils literal"><span class="pre">a.b.c</span></tt> with the value <tt class="docutils literal"><span class="pre">123</span></tt>, add the following element to an appropriate file.</p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>a.b.c<span class="nt"></name></span> + <span class="nt"><value></span>123<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +<p>Tajo has a variety of internal configs. If you don’t set some config explicitly, the default config will be used for for that config. Tajo is designed to use only a few of configs in usual cases. You may not be concerned with the configuration.</p> +<p>In default, there is no <tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt> in <tt class="docutils literal"><span class="pre">${TAJO}/conf</span></tt> directory. If you set some configs, first copy <tt class="docutils literal"><span class="pre">$TAJO_HOME/conf/tajo-site.xml.templete</span></tt> to <tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt>. Then, add the configs to your tajo-site.</p> +</div> +<div class="section" id="tajo-env-sh"> +<h2>tajo-env.sh<a class="headerlink" href="#tajo-env-sh" title="Permalink to this headline">¶</a></h2> +<p>tajo-env.sh is a shell script file. The main purpose of this file is to set shell environment variables for TajoMaster and TajoWorker java program. So, you can set some variable as follows:</p> +<div class="highlight-sh"><div class="highlight"><pre><span class="nv">VARIABLE</span><span class="o">=</span>value +</pre></div> +</div> +<p>If a value is a literal string, type this as follows:</p> +<div class="highlight-sh"><div class="highlight"><pre><span class="nv">VARIABLE</span><span class="o">=</span><span class="s1">'value'</span> +</pre></div> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="cluster_setup.html" class="btn btn-neutral float-right" title="Cluster Setup"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="../configuration.html" class="btn btn-neutral" title="Configuration"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'0.8.0', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: true + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html> \ No newline at end of file Added: tajo/site/docs/current/configuration/tajo_master_configuration.html URL: http://svn.apache.org/viewvc/tajo/site/docs/current/configuration/tajo_master_configuration.html?rev=1644658&view=auto ============================================================================== --- tajo/site/docs/current/configuration/tajo_master_configuration.html (added) +++ tajo/site/docs/current/configuration/tajo_master_configuration.html Thu Dec 11 14:43:31 2014 @@ -0,0 +1,259 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Tajo Master Configuration — Apache Tajo 0.8.0 documentation</title> + + + + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:400,700|Inconsolata:400,700' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" /> + + + + <link rel="top" title="Apache Tajo 0.8.0 documentation" href="../index.html"/> + <link rel="up" title="Configuration" href="../configuration.html"/> + <link rel="next" title="Worker Configuration" href="worker_configuration.html"/> + <link rel="prev" title="Cluster Setup" href="cluster_setup.html"/> + + + <script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js";></script> + +</head> + +<body class="wy-body-for-nav" role="document"> + + <div class="wy-grid-for-nav"> + + + <nav data-toggle="wy-nav-shift" class="wy-nav-side"> + <div class="wy-side-nav-search"> + <a href="../index.html" class="fa fa-home"> Apache Tajo</a> + <div role="search"> + <form id ="rtd-search-form" class="wy-form" action="../search.html" method="get"> + <input type="text" name="q" placeholder="Search docs" /> + <input type="hidden" name="check_keywords" value="yes" /> + <input type="hidden" name="area" value="default" /> + </form> +</div> + </div> + + <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation"> + + + <ul class="current"> +<li class="toctree-l1"><a class="reference internal" href="../introduction.html">Introduction</a></li> +<li class="toctree-l1"><a class="reference internal" href="../getting_started.html">Getting Started</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../getting_started/prerequisites.html">Prerequisites</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started/downloading_source.html">Dowload and unpack the source code</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started/building.html">Build source code</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started/local_setup.html">Setting up a local Tajo cluster</a></li> +<li class="toctree-l2"><a class="reference internal" href="../getting_started/first_query.html">First query execution</a></li> +</ul> +</li> +<li class="toctree-l1 current"><a class="reference internal" href="../configuration.html">Configuration</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="preliminary.html">Preliminary</a></li> +<li class="toctree-l2"><a class="reference internal" href="cluster_setup.html">Cluster Setup</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="">Tajo Master Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="worker_configuration.html">Worker Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="catalog_configuration.html">Catalog Configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="configuration_defaults.html">Configuration Defaults</a></li> +<li class="toctree-l2"><a class="reference internal" href="ha_configuration.html">High Availability for TajoMaster</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tsql.html">Tajo Shell (TSQL)</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../tsql/meta_command.html">Meta Commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/dfs_command.html">Executing HDFS commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/variables.html">Session Variables</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/admin_command.html">Administration Commands</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/intro.html">Introducing to TSQL</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/single_command.html">Executing a single command</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/execute_file.html">Executing Queries from Files</a></li> +<li class="toctree-l2"><a class="reference internal" href="../tsql/background_command.html">Executing as background process</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../sql_language.html">SQL Language</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/data_model.html">Data Model</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/ddl.html">Data Definition Language</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/insert.html">INSERT (OVERWRITE) INTO</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/queries.html">Queries</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/sql_expression.html">SQL Expressions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../sql_language/predicates.html">Predicates</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../functions.html">Functions</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../functions/math_func_and_operators.html">Math Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/string_func_and_operators.html">String Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/datetime_func_and_operators.html">DateTime Functions and Operators</a></li> +<li class="toctree-l2"><a class="reference internal" href="../functions/network_func_and_operators.html">Network Functions and Operators</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../table_management.html">Table Management</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../table_management/file_formats.html">File Formats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../table_management/compression.html">Compression</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../table_partitioning.html">Table Partitioning</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/intro_to_partitioning.html">Introduction to Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/column_partitioning.html">Column Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/range_partitioning.html">Range Partitioning</a></li> +<li class="toctree-l2"><a class="reference internal" href="../partitioning/hash_partitioning.html">Hash Partitioning</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../backup_and_restore.html">Backup and Restore</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../backup_and_restore/catalog.html">Backup and Restore Catalog</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../hcatalog_integration.html">HCatalog Integration</a></li> +<li class="toctree-l1"><a class="reference internal" href="../jdbc_driver.html">Tajo JDBC Driver</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#how-to-get-jdbc-driver">How to get JDBC driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#setting-the-classpath">Setting the CLASSPATH</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#faq">FAQ</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tajo_client_api.html">Tajo Client API</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li> +</ul> + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Apache Tajo</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../configuration.html">Configuration</a> »</li> + + <li>Tajo Master Configuration</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/configuration/tajo_master_configuration.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="tajo-master-configuration"> +<h1>Tajo Master Configuration<a class="headerlink" href="#tajo-master-configuration" title="Permalink to this headline">¶</a></h1> +<div class="section" id="tajo-rootdir"> +<h2>Tajo Rootdir<a class="headerlink" href="#tajo-rootdir" title="Permalink to this headline">¶</a></h2> +<p>Tajo uses HDFS as a primary storage layer. So, one Tajo cluster instance should have one tajo rootdir. A user is allowed to specific your tajo rootdir as follows:</p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.rootdir<span class="nt"></name></span> + <span class="nt"><value></span>hdfs://namenode_hostname:port/path<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +<p>Tajo rootdir must be a url form like <tt class="docutils literal"><span class="pre">scheme://hostname:port/path</span></tt>. The current implementaion only supports <tt class="docutils literal"><span class="pre">hdfs://</span></tt> and <tt class="docutils literal"><span class="pre">file://</span></tt> schemes. The default value is <tt class="docutils literal"><span class="pre">file:///tmp/tajo-${user.name}/</span></tt>.</p> +</div> +<div class="section" id="tajomaster-heap-memory-size"> +<h2>TajoMaster Heap Memory Size<a class="headerlink" href="#tajomaster-heap-memory-size" title="Permalink to this headline">¶</a></h2> +<p>The environment variable TAJO_MASTER_HEAPSIZE in conf/tajo-env.sh allow Tajo Master to use the specified heap memory size.</p> +<p>If you want to adjust heap memory size, set <tt class="docutils literal"><span class="pre">TAJO_MASTER_HEAPSIZE</span></tt> variable in <tt class="docutils literal"><span class="pre">conf/tajo-env.sh</span></tt> with a proper size as follows:</p> +<div class="highlight-sh"><div class="highlight"><pre><span class="nv">TAJO_MASTER_HEAPSIZE</span><span class="o">=</span>2000 +</pre></div> +</div> +<p>The default size is 1000 (1GB).</p> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer 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id="worker-configuration"> +<h1>Worker Configuration<a class="headerlink" href="#worker-configuration" title="Permalink to this headline">¶</a></h1> +<div class="section" id="worker-heap-memory-size"> +<h2>Worker Heap Memory Size<a class="headerlink" href="#worker-heap-memory-size" title="Permalink to this headline">¶</a></h2> +<p>The environment variable <tt class="docutils literal"><span class="pre">TAJO_WORKER_HEAPSIZE</span></tt> in <tt class="docutils literal"><span class="pre">conf/tajo-env.sh</span></tt> allow Tajo Worker to use the specified heap memory size.</p> +<p>If you want to adjust heap memory size, set <tt class="docutils literal"><span class="pre">TAJO_WORKER_HEAPSIZE</span></tt> variable in <tt class="docutils literal"><span class="pre">conf/tajo-env.sh</span></tt> with a proper size as follows:</p> +<div class="highlight-bash"><div class="highlight"><pre><span class="nv">TAJO_WORKER_HEAPSIZE</span><span class="o">=</span>8000 +</pre></div> +</div> +<p>The default size is 1000 (1GB).</p> +</div> +<div class="section" id="temporary-data-directory"> +<h2>Temporary Data Directory<a class="headerlink" href="#temporary-data-directory" title="Permalink to this headline">¶</a></h2> +<p>TajoWorker stores temporary data on local file system due to out-of-core algorithms. It is possible to specify one or more temporary data directories where temporary data will be stored.</p> +<p><tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt></p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.worker.tmpdir.locations<span class="nt"></name></span> + <span class="nt"><value></span>/disk1/tmpdir,/disk2/tmpdir,/disk3/tmpdir<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +</div> +<div class="section" id="maximum-number-of-parallel-running-tasks-for-each-worker"> +<h2>Maximum number of parallel running tasks for each worker<a class="headerlink" href="#maximum-number-of-parallel-running-tasks-for-each-worker" title="Permalink to this headline">¶</a></h2> +<p>In Tajo, the capacity of running tasks in parallel are determined by available resources and workload of running queries. In order to specify it, please see [Worker Resources] (#ResourceConfiguration) section.</p> +</div> +<div class="section" id="worker-resources"> +<h2>Worker Resources<a class="headerlink" href="#worker-resources" title="Permalink to this headline">¶</a></h2> +<p>Each worker can execute multiple tasks simultaneously. +In Tajo, users can specify the total size of memory and the number of disks for each worker. Available resources affect how many tasks are executed simultaneously.</p> +<p>In order to specify the resource capacity of each worker, you should add the following configs to <tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt> :</p> +<table border="1" class="docutils"> +<colgroup> +<col width="32%" /> +<col width="25%" /> +<col width="18%" /> +<col width="24%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">property name</th> +<th class="head">description</th> +<th class="head">value type</th> +<th class="head">default value</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td>tajo.worker.resource.cpu-cores</td> +<td>the number of cpu cores</td> +<td>integer</td> +<td>1</td> +</tr> +<tr class="row-odd"><td>tajo.worker.resource.memory-mb</td> +<td>memory size (MB)</td> +<td>integer</td> +<td>1024</td> +</tr> +<tr class="row-even"><td>tajo.worker.resource.disks</td> +<td>the number of disks</td> +<td>integer</td> +<td>1</td> +</tr> +</tbody> +</table> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Currently, QueryMaster requests 512MB memory and 0.5 disk per task for the backward compatibility.</p> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">If <tt class="docutils literal"><span class="pre">tajo.worker.resource.dfs-dir-aware</span></tt> is set to <tt class="docutils literal"><span class="pre">true</span></tt> in <tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt>, the worker will aware of and use the number of HDFS datanode’s data dirs in the node. +In other words, <tt class="docutils literal"><span class="pre">tajo.worker.resource.disks</span></tt> is ignored.</p> +</div> +<div class="section" id="example"> +<h3>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h3> +<p>Assume that you want to give 5120 MB memory, 4 disks, and 24 cores on each worker. The example configuration is as follows:</p> +<p><tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt></p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.worker.resource.tajo.worker.resource.cpu-cores<span class="nt"></name></span> + <span class="nt"><value></span>24<span class="nt"></value></span> +<span class="nt"></property></span> + + <span class="nt"><property></span> + <span class="nt"><name></span>tajo.worker.resource.memory-mb<span class="nt"></name></span> + <span class="nt"><value></span>5120<span class="nt"></value></span> +<span class="nt"></property></span> + +<span class="nt"><property></span> + <span class="nt"><name></span>tajo.worker.resource.tajo.worker.resource.disks<span class="nt"></name></span> + <span class="nt"><value></span>4.0<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +</div> +<div class="section" id="dedicated-mode"> +<h3>Dedicated Mode<a class="headerlink" href="#dedicated-mode" title="Permalink to this headline">¶</a></h3> +<p>Tajo provides a dedicated mode that allows each worker in a Tajo cluster to use whole available system resources including cpu-cores, memory, and disks. For this mode, a user should add the following config to <tt class="docutils literal"><span class="pre">tajo-site.xml</span></tt> :</p> +<div class="highlight-xml"><div class="highlight"><pre><span class="nt"><property></span> + <span class="nt"><name></span>tajo.worker.resource.dedicated<span class="nt"></name></span> + <span class="nt"><value></span>true<span class="nt"></value></span> +<span class="nt"></property></span> +</pre></div> +</div> +<p>In addition, it can limit the memory capacity used for Tajo worker as follows:</p> +<table border="1" class="docutils"> +<colgroup> +<col width="34%" /> +<col width="35%" /> +<col width="14%" /> +<col width="17%" /> +</colgroup> +<thead valign="bottom"> +<tr class="row-odd"><th class="head">property name</th> +<th class="head">description</th> +<th class="head">value type</th> +<th class="head">default value</th> +</tr> +</thead> +<tbody valign="top"> +<tr class="row-even"><td>tajo.worker.resource.dedicated-memory-ratio</td> +<td>how much memory to be used in whole memory</td> +<td>float</td> +<td>0.8</td> +</tr> +</tbody> +</table> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="catalog_configuration.html" class="btn btn-neutral float-right" title="Catalog Configuration"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="tajo_master_configuration.html" class="btn btn-neutral" title="Tajo Master Configuration"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'0.8.0', + COLLAPSE_INDEX:false, 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