Added: cassandra/site/publish/doc/3.10/getting_started/index.html URL: http://svn.apache.org/viewvc/cassandra/site/publish/doc/3.10/getting_started/index.html?rev=1757435&view=auto ============================================================================== --- cassandra/site/publish/doc/3.10/getting_started/index.html (added) +++ cassandra/site/publish/doc/3.10/getting_started/index.html Tue Aug 23 20:58:08 2016 @@ -0,0 +1,293 @@ +<!DOCTYPE html> +<html> + + + + +<head> + <meta charset="utf-8"> + <meta http-equiv="X-UA-Compatible" content="IE=edge"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="description" content="The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. +"> + <meta name="keywords" content="cassandra, apache, apache cassandra, distributed storage, key value store, scalability, bigtable, dynamo" /> + <meta name="robots" content="index,follow" /> + <meta name="language" content="en" /> + + <title>Documentation</title> + + <link rel="canonical" href="http://cassandra.apache.org/doc/3.10/getting_started/";> + + <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"; integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> + <link rel="stylesheet" href="./../../../css/style.css"> + + <link rel="stylesheet" href="./../../../css/sphinx.css"> + + + <link rel="top" title="Apache Cassandra Documentation v3.10" href="../index.html"/> <link rel="next" title="Installing Cassandra" href="installing.html"/> <link rel="prev" title="Welcome to Apache Cassandraâs documentation!" href="../index.html"/> +</head> + + <body> + <!-- breadcrumbs --> +<div class="topnav"> + <div class="container breadcrumb-container"> + <ul class="breadcrumb"> + <li> + <div class="dropdown"> + <img class="asf-logo" src="./../../../img/asf_feather.png" /> + <a data-toggle="dropdown" href="#">Apache Software Foundation <span class="caret"></span></a> + <ul class="dropdown-menu" role="menu" aria-labelledby="dLabel"> + <li><a href="http://www.apache.org";>Apache Homepage</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + </ul> + </div> + </li> + + + <li><a href="./../../../">Apache Cassandra</a></li> + + + + + 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name="area" value="default" /> + </div> + </form> + + + + <ul class="current"> +<li class="toctree-l1 current"><a class="current reference internal" href="#">Getting Started</a><ul> +<li class="toctree-l2"><a class="reference internal" href="installing.html">Installing Cassandra</a></li> +<li class="toctree-l2"><a class="reference internal" href="configuring.html">Configuring Cassandra</a></li> +<li class="toctree-l2"><a class="reference internal" href="querying.html">Inserting and querying</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html">Client drivers</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../architecture/index.html">Architecture</a></li> +<li class="toctree-l1"><a class="reference internal" href="../data_modeling/index.html">Data Modeling</a></li> +<li class="toctree-l1"><a class="reference internal" href="../cql/index.html">The Cassandra Query Language (CQL)</a></li> +<li class="toctree-l1"><a class="reference internal" href="../configuration/index.html">Configuring Cassandra</a></li> +<li class="toctree-l1"><a class="reference internal" href="../operating/index.html">Operating Cassandra</a></li> +<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">Cassandra Tools</a></li> +<li class="toctree-l1"><a class="reference internal" href="../troubleshooting/index.html">Troubleshooting</a></li> +<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Cassandra Development</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">Frequently Asked Questions</a></li> +<li class="toctree-l1"><a class="reference internal" href="../bugs.html">Reporting Bugs and Contributing</a></li> +<li class="toctree-l1"><a class="reference internal" href="../contactus.html">Contact us</a></li> +</ul> + + + + </div><!--/.nav-collapse --> + </div> + </div> + </div> + <div class="col-md-8"> + <div class="content doc-content"> + <div class="container"> + + <div class="section" id="getting-started"> +<h1>Getting Started<a class="headerlink" href="#getting-started" title="Permalink to this headline">¶</a></h1> +<p>This section covers how to get started using Apache Cassandra and should be the first thing to read if you are new to +Cassandra.</p> +<div class="toctree-wrapper compound"> +<ul> +<li class="toctree-l1"><a class="reference internal" href="installing.html">Installing Cassandra</a><ul> +<li class="toctree-l2"><a class="reference internal" href="installing.html#prerequisites">Prerequisites</a></li> +<li class="toctree-l2"><a class="reference internal" href="installing.html#installation-from-binary-tarball-files">Installation from binary tarball files</a></li> +<li class="toctree-l2"><a class="reference internal" href="installing.html#installation-from-debian-packages">Installation from Debian packages</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="configuring.html">Configuring Cassandra</a><ul> +<li class="toctree-l2"><a class="reference internal" href="configuring.html#main-runtime-properties">Main runtime properties</a></li> +<li class="toctree-l2"><a class="reference internal" href="configuring.html#changing-the-location-of-directories">Changing the location of directories</a></li> +<li class="toctree-l2"><a class="reference internal" href="configuring.html#environment-variables">Environment variables</a></li> +<li class="toctree-l2"><a class="reference internal" href="configuring.html#logging">Logging</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="querying.html">Inserting and querying</a><ul> +<li class="toctree-l2"><a class="reference internal" href="querying.html#cqlsh">CQLSH</a></li> +<li class="toctree-l2"><a class="reference internal" href="querying.html#client-drivers">Client drivers</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="drivers.html">Client drivers</a><ul> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#java">Java</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#python">Python</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#ruby">Ruby</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#c-net">C# / .NET</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#nodejs">Nodejs</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#php">PHP</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#c">C++</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#scala">Scala</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#clojure">Clojure</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html#erlang">Erlang</a></li> +<li 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Added: cassandra/site/publish/doc/3.10/getting_started/installing.html URL: http://svn.apache.org/viewvc/cassandra/site/publish/doc/3.10/getting_started/installing.html?rev=1757435&view=auto ============================================================================== --- cassandra/site/publish/doc/3.10/getting_started/installing.html (added) +++ cassandra/site/publish/doc/3.10/getting_started/installing.html Tue Aug 23 20:58:08 2016 @@ -0,0 +1,337 @@ +<!DOCTYPE html> +<html> + + + + +<head> + <meta charset="utf-8"> + <meta http-equiv="X-UA-Compatible" content="IE=edge"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="description" content="The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. +"> + <meta name="keywords" content="cassandra, apache, apache cassandra, distributed storage, key value store, scalability, bigtable, dynamo" /> + <meta name="robots" content="index,follow" /> + <meta name="language" content="en" /> + + <title>Documentation</title> + + <link rel="canonical" href="http://cassandra.apache.org/doc/3.10/getting_started/installing.html";> + + <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"; integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> + <link rel="stylesheet" href="./../../../css/style.css"> + + <link rel="stylesheet" href="./../../../css/sphinx.css"> + + + <link rel="top" title="Apache Cassandra Documentation v3.10" href="../index.html"/> <link rel="up" title="Getting Started" href="index.html"/> <link rel="next" title="Configuring Cassandra" href="configuring.html"/> <link rel="prev" title="Getting Started" href="index.html"/> +</head> + + <body> + <!-- breadcrumbs --> +<div class="topnav"> + <div class="container breadcrumb-container"> + <ul class="breadcrumb"> + <li> + <div class="dropdown"> + <img class="asf-logo" src="./../../../img/asf_feather.png" /> + <a data-toggle="dropdown" href="#">Apache Software Foundation <span class="caret"></span></a> + <ul class="dropdown-menu" role="menu" aria-labelledby="dLabel"> + <li><a href="http://www.apache.org";>Apache Homepage</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks</a></li> + <li><a href="http://www.apache.org/security/";>Security</a></li> + </ul> + </div> + </li> + + + <li><a 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href="./../../../download/">Download</a></li> + <li><a href="./../../../doc/">Documentation</a></li> + <li><a href="./../../../community/">Community</a></li> + </ul> + </div><!-- /#cassandra-menu --> + + + </div> + </nav><!-- /.navbar --> +</div><!-- /.topnav --> + + <div class="container-fluid"> + <div class="row"> + <div class="col-md-2"> + <div class="doc-navigation"> + <div class="doc-menu" role="navigation"> + <div class="navbar-header"> + <button type="button" class="pull-left navbar-toggle" data-toggle="collapse" data-target=".sidebar-navbar-collapse"> + <span class="sr-only">Toggle navigation</span> + <span class="icon-bar"></span> + <span class="icon-bar"></span> + <span class="icon-bar"></span> + </button> + </div> + <div class="navbar-collapse collapse sidebar-navbar-collapse"> + <form id="doc-search-form" class="navbar-form" action="../search.html" method="get" role="search"> + <div class="form-group"> + <input type="text" size="30" class="form-control input-sm" name="q" placeholder="Search docs"> + <input type="hidden" name="check_keywords" value="yes" /> + <input type="hidden" name="area" value="default" /> + </div> + </form> + + + + <ul class="current"> +<li class="toctree-l1 current"><a class="reference internal" href="index.html">Getting Started</a><ul class="current"> +<li class="toctree-l2 current"><a class="current reference internal" href="#">Installing Cassandra</a><ul> +<li class="toctree-l3"><a class="reference internal" href="#prerequisites">Prerequisites</a></li> +<li class="toctree-l3"><a class="reference internal" href="#installation-from-binary-tarball-files">Installation from binary tarball files</a></li> +<li class="toctree-l3"><a class="reference internal" href="#installation-from-debian-packages">Installation from Debian packages</a></li> +</ul> +</li> +<li class="toctree-l2"><a class="reference internal" href="configuring.html">Configuring Cassandra</a></li> +<li class="toctree-l2"><a class="reference internal" href="querying.html">Inserting and querying</a></li> +<li class="toctree-l2"><a class="reference internal" href="drivers.html">Client drivers</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../architecture/index.html">Architecture</a></li> +<li class="toctree-l1"><a class="reference internal" href="../data_modeling/index.html">Data Modeling</a></li> +<li class="toctree-l1"><a class="reference internal" href="../cql/index.html">The Cassandra Query Language (CQL)</a></li> +<li class="toctree-l1"><a class="reference internal" href="../configuration/index.html">Configuring Cassandra</a></li> +<li class="toctree-l1"><a class="reference internal" href="../operating/index.html">Operating Cassandra</a></li> +<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">Cassandra Tools</a></li> +<li class="toctree-l1"><a class="reference internal" href="../troubleshooting/index.html">Troubleshooting</a></li> +<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Cassandra Development</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">Frequently Asked Questions</a></li> +<li class="toctree-l1"><a class="reference internal" href="../bugs.html">Reporting Bugs and Contributing</a></li> +<li class="toctree-l1"><a class="reference internal" href="../contactus.html">Contact us</a></li> +</ul> + + + + </div><!--/.nav-collapse --> + </div> + </div> + </div> + <div class="col-md-8"> + <div class="content doc-content"> + <div class="container"> + + <div class="section" id="installing-cassandra"> +<h1>Installing Cassandra<a class="headerlink" href="#installing-cassandra" title="Permalink to this headline">¶</a></h1> +<div class="section" id="prerequisites"> +<h2>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li>The latest version of Java 8, either the <a class="reference external" href="http://www.oracle.com/technetwork/java/javase/downloads/index.html";>Oracle Java Standard Edition 8</a> or <a class="reference external" href="http://openjdk.java.net/";>OpenJDK 8</a>. To +verify that you have the correct version of java installed, type <code class="docutils literal"><span class="pre">java</span> <span class="pre">-version</span></code>.</li> +<li>For using cqlsh, the latest version of <a class="reference external" href="https://www.python.org/downloads/";>Python 2.7</a>. To verify that you have +the correct version of Python installed, type <code class="docutils literal"><span class="pre">python</span> <span class="pre">--version</span></code>.</li> +</ul> +</div> +<div class="section" id="installation-from-binary-tarball-files"> +<h2>Installation from binary tarball files<a class="headerlink" href="#installation-from-binary-tarball-files" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li>Download the latest stable release from the <a class="reference external" href="http://cassandra.apache.org/download/";>Apache Cassandra downloads website</a>.</li> +<li>Untar the file somewhere, for example:</li> +</ul> +<div class="highlight-none"><div class="highlight"><pre><span></span>tar -xvf apache-cassandra-3.6-bin.tar.gz cassandra +</pre></div> +</div> +<p>The files will be extracted into <code class="docutils literal"><span class="pre">apache-cassandra-3.6</span></code>, you need to substitute 3.6 with the release number that you +have downloaded.</p> +<ul class="simple"> +<li>Optionally add <code class="docutils literal"><span class="pre">apache-cassandra-3.6\bin</span></code> to your path.</li> +<li>Start Cassandra in the foreground by invoking <code class="docutils literal"><span class="pre">bin/cassandra</span> <span class="pre">-f</span></code> from the command line. Press “Control-C” to stop +Cassandra. Start Cassandra in the background by invoking <code class="docutils literal"><span class="pre">bin/cassandra</span></code> from the command line. Invoke <code class="docutils literal"><span class="pre">kill</span> <span class="pre">pid</span></code> +or <code class="docutils literal"><span class="pre">pkill</span> <span class="pre">-f</span> <span class="pre">CassandraDaemon</span></code> to stop Cassandra, where pid is the Cassandra process id, which you can find for +example by invoking <code class="docutils literal"><span class="pre">pgrep</span> <span class="pre">-f</span> <span class="pre">CassandraDaemon</span></code>.</li> +<li>Verify that Cassandra is running by invoking <code class="docutils literal"><span class="pre">bin/nodetool</span> <span class="pre">status</span></code> from the command line.</li> +<li>Configuration files are located in the <code class="docutils literal"><span class="pre">conf</span></code> sub-directory.</li> +<li>Since Cassandra 2.1, log and data directories are located in the <code class="docutils literal"><span class="pre">logs</span></code> and <code class="docutils literal"><span class="pre">data</span></code> sub-directories respectively. +Older versions defaulted to <code class="docutils literal"><span class="pre">/var/log/cassandra</span></code> and <code class="docutils literal"><span class="pre">/var/lib/cassandra</span></code>. Due to this, it is necessary to either +start Cassandra with root privileges or change <code class="docutils literal"><span class="pre">conf/cassandra.yaml</span></code> to use directories owned by the current user, +as explained below in the section on changing the location of directories.</li> +</ul> +</div> +<div class="section" id="installation-from-debian-packages"> +<h2>Installation from Debian packages<a class="headerlink" href="#installation-from-debian-packages" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li>Add the Apache repository of Cassandra to <code class="docutils literal"><span class="pre">/etc/apt/sources.list.d/cassandra.sources.list</span></code>, for example for version +3.6:</li> +</ul> +<div class="highlight-none"><div class="highlight"><pre><span></span>echo "deb http://www.apache.org/dist/cassandra/debian 36x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list +</pre></div> +</div> +<ul class="simple"> +<li>Update the repositories:</li> +</ul> +<div class="highlight-none"><div class="highlight"><pre><span></span>sudo apt-get update +</pre></div> +</div> +<ul class="simple"> +<li>If you encounter this error:</li> +</ul> +<div class="highlight-none"><div class="highlight"><pre><span></span>GPG error: http://www.apache.org 36x InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 749D6EEC0353B12C +</pre></div> +</div> +<p>Then add the public key 749D6EEC0353B12C as follows:</p> +<div class="highlight-none"><div class="highlight"><pre><span></span>gpg --keyserver pgp.mit.edu --recv-keys 749D6EEC0353B12C +gpg --export --armor 749D6EEC0353B12C | sudo apt-key add - +</pre></div> +</div> +<p>and repeat <code class="docutils literal"><span class="pre">sudo</span> <span class="pre">apt-get</span> <span class="pre">update</span></code>. The actual key may be different, you get it from the error message itself. For a +full list of Apache contributors public keys, you can refer to <a class="reference external" href="https://www.apache.org/dist/cassandra/KEYS";>this link</a>.</p> +<ul class="simple"> +<li>Install Cassandra:</li> +</ul> +<div class="highlight-none"><div class="highlight"><pre><span></span>sudo apt-get install cassandra +</pre></div> +</div> +<ul class="simple"> +<li>You can start Cassandra with <code class="docutils literal"><span class="pre">sudo</span> <span class="pre">service</span> <span class="pre">cassandra</span> <span class="pre">start</span></code> and stop it with <code class="docutils literal"><span class="pre">sudo</span> <span class="pre">service</span> <span class="pre">cassandra</span> <span class="pre">stop</span></code>. +However, normally the service will start automatically. For this reason be sure to stop it if you need to make any +configuration changes.</li> +<li>Verify that Cassandra is running by invoking <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">status</span></code> from the command line.</li> +<li>The default location of configuration files is <code class="docutils literal"><span class="pre">/etc/cassandra</span></code>.</li> +<li>The default location of log and data directories is <code class="docutils literal"><span class="pre">/var/log/cassandra/</span></code> and <code class="docutils literal"><span class="pre">/var/lib/cassandra</span></code>.</li> +</ul> +</div> +</div> + + + + + <div class="doc-prev-next-links" role="navigation" aria-label="footer navigation"> + + <a href="configuring.html" class="btn btn-default pull-right " role="button" title="Configuring Cassandra" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a> + + + <a href="index.html" class="btn btn-default" role="button" title="Getting Started" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a> + + </div> + + </div> + </div> + </div> + <div class="col-md-2"> + </div> + </div> +</div> + + <footer> + <div class="container"> + <div class="col-md-4 social-blk"> + <span class="social"> + <a href="https://twitter.com/cassandra"; + class="twitter-follow-button" + data-show-count="false" data-size="large">Follow @cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + <a href="https://twitter.com/intent/tweet?button_hashtag=cassandra"; + class="twitter-hashtag-button" + data-size="large" + data-related="ApacheCassandra">Tweet #cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + </span> + </div> + + <div class="col-md-8 trademark"> + <p>© 2016 <a href="http://apache.org";>The Apache Software Foundation</a>. + Apache, the Apache feather logo, and Apache Cassandra are trademarks of The Apache Software Foundation. + <p> + </div> + </div><!-- /.container --> +</footer> + +<!-- Javascript. 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Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. +"> + <meta name="keywords" content="cassandra, apache, apache cassandra, distributed storage, key value store, scalability, bigtable, dynamo" /> + <meta name="robots" content="index,follow" /> + <meta name="language" content="en" /> + + <title>Documentation</title> + + <link rel="canonical" href="http://cassandra.apache.org/doc/3.10/getting_started/querying.html";> + + <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"; integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> + <link rel="stylesheet" href="./../../../css/style.css"> + + <link rel="stylesheet" href="./../../../css/sphinx.css"> + + + <link rel="top" title="Apache Cassandra Documentation v3.10" href="../index.html"/> <link rel="up" 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To use CQL, you will need to connect to the +cluster, which can be done:</p> +<ul class="simple"> +<li>either using cqlsh,</li> +<li>or through a client driver for Cassandra.</li> +</ul> +<div class="section" id="cqlsh"> +<h2>CQLSH<a class="headerlink" href="#cqlsh" title="Permalink to this headline">¶</a></h2> +<p>cqlsh is a command line shell for interacting with Cassandra through CQL. It is shipped with every Cassandra package, +and can be found in the bin/ directory alongside the cassandra executable. It connects to the single node specified on +the command line. For example:</p> +<div class="highlight-default"><div class="highlight"><pre><span></span>$ bin/cqlsh localhost +Connected to Test Cluster at localhost:9042. +[cqlsh 5.0.1 | Cassandra 3.8 | CQL spec 3.4.2 | Native protocol v4] +Use HELP for help. +cqlsh> SELECT cluster_name, listen_address FROM system.local; + + cluster_name | listen_address +--------------+---------------- + Test Cluster | 127.0.0.1 + +(1 rows) +cqlsh> +</pre></div> +</div> +<p>See the <a class="reference internal" href="../tools/cqlsh.html#cqlsh"><span class="std std-ref">cqlsh section</span></a> for full documentation.</p> +</div> +<div class="section" id="client-drivers"> +<h2>Client drivers<a class="headerlink" href="#client-drivers" title="Permalink to this headline">¶</a></h2> +<p>A lot of client drivers are provided by the Community and a list of known drivers is provided in <a class="reference internal" href="drivers.html#client-drivers"><span class="std std-ref">the next section</span></a>. You should refer to the documentation of each drivers for more information on how to use them.</p> +</div> +</div> + + + + + <div class="doc-prev-next-links" role="navigation" aria-label="footer navigation"> + + <a href="drivers.html" class="btn btn-default pull-right " role="button" title="Client drivers" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a> + + + <a href="configuring.html" class="btn btn-default" role="button" title="Configuring Cassandra" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a> + + </div> + + </div> + </div> + </div> + <div class="col-md-2"> + </div> + </div> +</div> + + <footer> + <div class="container"> + <div class="col-md-4 social-blk"> + <span class="social"> + <a href="https://twitter.com/cassandra"; + class="twitter-follow-button" + data-show-count="false" data-size="large">Follow @cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + <a href="https://twitter.com/intent/tweet?button_hashtag=cassandra"; + class="twitter-hashtag-button" + data-size="large" + data-related="ApacheCassandra">Tweet #cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + </span> + </div> + + <div class="col-md-8 trademark"> + <p>© 2016 <a href="http://apache.org";>The Apache Software Foundation</a>. + Apache, the Apache feather logo, and Apache Cassandra are trademarks of The Apache Software Foundation. + <p> + </div> + </div><!-- /.container --> +</footer> + +<!-- Javascript. 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To avoid checking every +SSTable data file for the partition being requested, Cassandra employs a data structure known as a bloom filter.</p> +<p>Bloom filters are a probabilistic data structure that allows Cassandra to determine one of two possible states: - The +data definitely does not exist in the given file, or - The data probably exists in the given file.</p> +<p>While bloom filters can not guarantee that the data exists in a given SSTable, bloom filters can be made more accurate +by allowing them to consume more RAM. Operators have the opportunity to tune this behavior per table by adjusting the +the <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> to a float between 0 and 1.</p> +<p>The default value for <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> is 0.1 for tables using LeveledCompactionStrategy and 0.01 for all +other cases.</p> +<p>Bloom filters are stored in RAM, but are stored offheap, so operators should not consider bloom filters when selecting +the maximum heap size. As accuracy improves (as the <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> gets closer to 0), memory usage +increases non-linearly - the bloom filter for <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span> <span class="pre">=</span> <span class="pre">0.01</span></code> will require about three times as much +memory as the same table with <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span> <span class="pre">=</span> <span class="pre">0.1</span></code>.</p> +<p>Typical values for <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> are usually between 0.01 (1%) to 0.1 (10%) false-positive chance, where +Cassandra may scan an SSTable for a row, only to find that it does not exist on the disk. The parameter should be tuned +by use case:</p> +<ul class="simple"> +<li>Users with more RAM and slower disks may benefit from setting the <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> to a numerically lower +number (such as 0.01) to avoid excess IO operations</li> +<li>Users with less RAM, more dense nodes, or very fast disks may tolerate a higher <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> in order to +save RAM at the expense of excess IO operations</li> +<li>In workloads that rarely read, or that only perform reads by scanning the entire data set (such as analytics +workloads), setting the <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> to a much higher number is acceptable.</li> +</ul> +<div class="section" id="changing"> +<h2>Changing<a class="headerlink" href="#changing" title="Permalink to this headline">¶</a></h2> +<p>The bloom filter false positive chance is visible in the <code class="docutils literal"><span class="pre">DESCRIBE</span> <span class="pre">TABLE</span></code> output as the field +<code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code>. Operators can change the value with an <code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span></code> statement:</p> +<div class="highlight-none"><div class="highlight"><pre><span></span>ALTER TABLE keyspace.table WITH bloom_filter_fp_chance=0.01 +</pre></div> +</div> +<p>Operators should be aware, however, that this change is not immediate: the bloom filter is calculated when the file is +written, and persisted on disk as the Filter component of the SSTable. Upon issuing an <code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span></code> statement, new +files on disk will be written with the new <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code>, but existing sstables will not be modified until +they are compacted - if an operator needs a change to <code class="docutils literal"><span class="pre">bloom_filter_fp_chance</span></code> to take effect, they can trigger an +SSTable rewrite using <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">scrub</span></code> or <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">upgradesstables</span> <span class="pre">-a</span></code>, both of which will rebuild the sstables on +disk, regenerating the bloom filters in the progress.</p> +</div> +</div> + + + + + <div class="doc-prev-next-links" role="navigation" aria-label="footer navigation"> + + <a href="compression.html" class="btn btn-default pull-right " role="button" title="Compression" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a> + + + <a href="compaction.html" class="btn btn-default" role="button" title="Compaction" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a> + + </div> + + </div> + </div> + </div> + <div class="col-md-2"> + </div> + </div> +</div> + + <footer> + <div class="container"> + <div class="col-md-4 social-blk"> + <span class="social"> + <a href="https://twitter.com/cassandra"; + class="twitter-follow-button" + data-show-count="false" data-size="large">Follow @cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + <a href="https://twitter.com/intent/tweet?button_hashtag=cassandra"; + class="twitter-hashtag-button" + data-size="large" + data-related="ApacheCassandra">Tweet #cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + </span> + </div> + + <div class="col-md-8 trademark"> + <p>© 2016 <a href="http://apache.org";>The Apache Software Foundation</a>. + Apache, the Apache feather logo, and Apache Cassandra are trademarks of The Apache Software Foundation. + <p> + </div> + </div><!-- /.container --> +</footer> + +<!-- Javascript. 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