content/doc/latest/tools/sstable/sstableofflinerelevel.html - cassandra-website - Git at Google

 <!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/latest/tools/sstable/sstableofflinerelevel.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 v4.0-alpha5" href="../../index.html"/> <link rel="up" title="SSTable Tools" href="index.html"/> <link rel="next" title="sstablerepairedset" href="sstablerepairedset.html"/> <link rel="prev" title="sstablemetadata" href="sstablemetadata.html"/>
   <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.2.0/css/all.css" integrity="sha384-hWVjflwFxL6sNzntih27bfxkr27PmbbK/iSvJ+a4+0owXq79v+lsFkW54bOGbiDQ" crossorigin="anonymous">

   <link type="application/atom+xml" rel="alternate" href="http://cassandra.apache.org/feed.xml" title="Apache Cassandra Website" />
 </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>


         <li><a href="./../../../../doc/latest/">Documentation</a></li>


       <li><a href="./">SSTable Tools</a></li>


       <li>sstableofflinerelevel</li>

     </ul>
   </div>

   <!-- navbar -->
   <nav class="navbar navbar-default navbar-static-top" role="navigation">
     <div class="container">
       <div class="navbar-header">
         <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#cassandra-menu" aria-expanded="false">
           <span class="sr-only">Toggle navigation</span>
           <span class="icon-bar"></span>
           <span class="icon-bar"></span>
           <span class="icon-bar"></span>
         </button>
         <a class="navbar-brand" href="./../../../../"><img src="./../../../../img/cassandra_logo.png" alt="Apache Cassandra logo" /></a>
       </div><!-- /.navbar-header -->

       <div id="cassandra-menu" class="collapse navbar-collapse">
         <ul class="nav navbar-nav navbar-right">
           <li><a href="./../../../../">Home</a></li>
           <li><a href="./../../../../download/">Download</a></li>
           <li><a href="./../../../../doc/latest/">Documentation</a></li>
           <li><a href="./../../../../community/">Community</a></li>
           <li>
             <a href="./../../../../blog/">Blog</a>
         </li>
         </ul>
       </div><!-- /#cassandra-menu -->


     </div>
   </nav><!-- /.navbar -->
 </div><!-- /.topnav -->

     <div class="container-fluid">
   <div class="row">
     <div class="col-md-3">
       <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"><a class="reference internal" href="../../getting_started/index.html">Getting Started</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../../new/index.html">New Features in Apache Cassandra 4.0</a></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="../../cql/index.html">The Cassandra Query Language (CQL)</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="../../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 current"><a class="reference internal" href="../index.html">Cassandra Tools</a><ul class="current">
 <li class="toctree-l2"><a class="reference internal" href="../cqlsh.html">cqlsh: the CQL shell</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../nodetool/nodetool.html">Nodetool</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../nodetool/nodetool.html#usage">Usage</a></li>
 <li class="toctree-l2 current"><a class="reference internal" href="index.html">SSTable Tools</a><ul class="current">
 <li class="toctree-l3"><a class="reference internal" href="sstabledump.html">sstabledump</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstableexpiredblockers.html">sstableexpiredblockers</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstablelevelreset.html">sstablelevelreset</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstableloader.html">sstableloader</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstablemetadata.html">sstablemetadata</a></li>
 <li class="toctree-l3 current"><a class="current reference internal" href="#">sstableofflinerelevel</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstablerepairedset.html">sstablerepairedset</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstablescrub.html">sstablescrub</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstablesplit.html">sstablesplit</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstableupgrade.html">sstableupgrade</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstableutil.html">sstableutil</a></li>
 <li class="toctree-l3"><a class="reference internal" href="sstableverify.html">sstableverify</a></li>
 </ul>
 </li>
 <li class="toctree-l2"><a class="reference internal" href="../cassandra_stress.html">Cassandra Stress</a></li>
 </ul>
 </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">Contributing to Cassandra</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="../../plugins/index.html">Third-Party Plugins</a></li>
 <li class="toctree-l1"><a class="reference internal" href="../../bugs.html">Reporting Bugs</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="content-container">

   <div class="section" id="sstableofflinerelevel">
 <h1>sstableofflinerelevel<a class="headerlink" href="#sstableofflinerelevel" title="Permalink to this headline">¶</a></h1>
 <p>When using LeveledCompactionStrategy, sstables can get stuck at L0 on a recently bootstrapped node, and compactions may never catch up. This tool is used to bump sstables into the highest level possible.</p>
 <p>ref: <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-8301">https://issues.apache.org/jira/browse/CASSANDRA-8301</a></p>
 <p>The way this is done is: sstables are storted by their last token. Given an original leveling like this (note that [ ] indicates token boundaries, not sstable size on disk; all sstables are the same size):</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">L3</span> <span class="p">[][][][][][][][][][][]</span>
 <span class="n">L2</span> <span class="p">[</span>    <span class="p">][</span>    <span class="p">][</span>    <span class="p">][</span>  <span class="p">]</span>
 <span class="n">L1</span> <span class="p">[</span>          <span class="p">][</span>        <span class="p">]</span>
 <span class="n">L0</span> <span class="p">[</span>                    <span class="p">]</span>
 </pre></div>
 </div>
 <p>Will look like this after being dropped to L0 and sorted by last token (and, to illustrate overlap, the overlapping ones are put on a new line):</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[][][]</span>
 <span class="p">[</span>    <span class="p">][][][]</span>
     <span class="p">[</span>    <span class="p">]</span>
 <span class="p">[</span>          <span class="p">]</span>
 <span class="o">...</span>
 </pre></div>
 </div>
 <p>Then, we start iterating from the smallest last-token and adding all sstables that do not cause an overlap to a level. We will reconstruct the original leveling top-down. Whenever we add an sstable to the level, we remove it from the sorted list. Once we reach the end of the sorted list, we have a full level, and can start over with the level below.</p>
 <p>If we end up with more levels than expected, we put all levels exceeding the expected in L0, for example, original L0 files will most likely be put in a level of its own since they most often overlap many other sstables.</p>
 <p>Cassandra must be stopped before this tool is executed, or unexpected results will occur. Note: the script does not verify that Cassandra is stopped.</p>
 <div class="section" id="usage">
 <h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
 <p>sstableofflinerelevel [–dry-run] &lt;keyspace&gt; &lt;table&gt;</p>
 </div>
 <div class="section" id="doing-a-dry-run">
 <h2>Doing a dry run<a class="headerlink" href="#doing-a-dry-run" title="Permalink to this headline">¶</a></h2>
 <p>Use the –dry-run option to see the current level distribution and predicted level after the change.</p>
 <p>Example:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableofflinerelevel</span> <span class="o">--</span><span class="n">dry</span><span class="o">-</span><span class="n">run</span> <span class="n">keyspace</span> <span class="n">eventlog</span>
 <span class="n">For</span> <span class="n">sstables</span> <span class="ow">in</span> <span class="o">/</span><span class="n">var</span><span class="o">/</span><span class="n">lib</span><span class="o">/</span><span class="n">cassandra</span><span class="o">/</span><span class="n">data</span><span class="o">/</span><span class="n">keyspace</span><span class="o">/</span><span class="n">eventlog</span><span class="o">-</span><span class="mi">6365332094</span><span class="n">dd11e88f324f9c503e4753</span><span class="p">:</span>
 <span class="n">Current</span> <span class="n">leveling</span><span class="p">:</span>
 <span class="n">L0</span><span class="o">=</span><span class="mi">2</span>
 <span class="n">Potential</span> <span class="n">leveling</span><span class="p">:</span>
 <span class="n">L0</span><span class="o">=</span><span class="mi">1</span>
 <span class="n">L1</span><span class="o">=</span><span class="mi">1</span>
 </pre></div>
 </div>
 </div>
 <div class="section" id="running-a-relevel">
 <h2>Running a relevel<a class="headerlink" href="#running-a-relevel" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableofflinerelevel</span> <span class="n">keyspace</span> <span class="n">eventlog</span>
 <span class="n">For</span> <span class="n">sstables</span> <span class="ow">in</span> <span class="o">/</span><span class="n">var</span><span class="o">/</span><span class="n">lib</span><span class="o">/</span><span class="n">cassandra</span><span class="o">/</span><span class="n">data</span><span class="o">/</span><span class="n">keyspace</span><span class="o">/</span><span class="n">eventlog</span><span class="o">-</span><span class="mi">6365332094</span><span class="n">dd11e88f324f9c503e4753</span><span class="p">:</span>
 <span class="n">Current</span> <span class="n">leveling</span><span class="p">:</span>
 <span class="n">L0</span><span class="o">=</span><span class="mi">2</span>
 <span class="n">New</span> <span class="n">leveling</span><span class="p">:</span>
 <span class="n">L0</span><span class="o">=</span><span class="mi">1</span>
 <span class="n">L1</span><span class="o">=</span><span class="mi">1</span>
 </pre></div>
 </div>
 </div>
 <div class="section" id="keyspace-or-table-not-found">
 <h2>Keyspace or table not found<a class="headerlink" href="#keyspace-or-table-not-found" title="Permalink to this headline">¶</a></h2>
 <p>If an invalid keyspace and/or table is provided, an exception will be thrown.</p>
 <p>Example:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableofflinerelevel</span> <span class="o">--</span><span class="n">dry</span><span class="o">-</span><span class="n">run</span> <span class="n">keyspace</span> <span class="n">evenlog</span>

 <span class="ne">Exception</span> <span class="ow">in</span> <span class="n">thread</span> <span class="s2">&quot;main&quot;</span> <span class="n">java</span><span class="o">.</span><span class="n">lang</span><span class="o">.</span><span class="n">IllegalArgumentException</span><span class="p">:</span> <span class="n">Unknown</span> <span class="n">keyspace</span><span class="o">/</span><span class="n">columnFamily</span> <span class="n">keyspace1</span><span class="o">.</span><span class="n">evenlog</span>
     <span class="n">at</span> <span class="n">org</span><span class="o">.</span><span class="n">apache</span><span class="o">.</span><span class="n">cassandra</span><span class="o">.</span><span class="n">tools</span><span class="o">.</span><span class="n">SSTableOfflineRelevel</span><span class="o">.</span><span class="n">main</span><span class="p">(</span><span class="n">SSTableOfflineRelevel</span><span class="o">.</span><span class="n">java</span><span class="p">:</span><span class="mi">96</span><span class="p">)</span>
 </pre></div>
 </div>
 </div>
 </div>


           <div class="doc-prev-next-links" role="navigation" aria-label="footer navigation">

             <a href="sstablerepairedset.html" class="btn btn-default pull-right " role="button" title="sstablerepairedset" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a>


             <a href="sstablemetadata.html" class="btn btn-default" role="button" title="sstablemetadata" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a>

           </div>

         </div>
       </div>
     </div>
   </div>
 </div>

     <hr />

 <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>
       <a class="subscribe-rss icon-link" href="/feed.xml" title="Subscribe to Blog via RSS">
           <span><i class="fa fa-rss"></i></span>
       </a>
     </div>

     <div class="col-md-8 trademark">
       <p>&copy; 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. Placed here so pages load faster -->
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
 <script src="./../../../../js/underscore-min.js"></script>
 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>


 <script src="./../../../../js/doctools.js"></script>
 <script src="./../../../../js/searchtools.js"></script>

  <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT:    "", VERSION:     "", COLLAPSE_INDEX: false, FILE_SUFFIX: ".html", HAS_SOURCE:  false, SOURCELINK_SUFFIX: ".txt" }; </script>


 <script type="text/javascript">
   var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
   document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));

   try {
     var pageTracker = _gat._getTracker("UA-11583863-1");
     pageTracker._trackPageview();
   } catch(err) {}
 </script>


   </body>
 </html>
	<!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/latest/tools/sstable/sstableofflinerelevel.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 v4.0-alpha5" href="../../index.html"/> <link rel="up" title="SSTable Tools" href="index.html"/> <link rel="next" title="sstablerepairedset" href="sstablerepairedset.html"/> <link rel="prev" title="sstablemetadata" href="sstablemetadata.html"/>
	<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.2.0/css/all.css" integrity="sha384-hWVjflwFxL6sNzntih27bfxkr27PmbbK/iSvJ+a4+0owXq79v+lsFkW54bOGbiDQ" crossorigin="anonymous">

	<link type="application/atom+xml" rel="alternate" href="http://cassandra.apache.org/feed.xml" title="Apache Cassandra Website" />
	</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>




	<li><a href="./../../../../doc/latest/">Documentation</a></li>




	<li><a href="./">SSTable Tools</a></li>



	<li>sstableofflinerelevel</li>

	</ul>
	</div>

	<!-- navbar -->
	<nav class="navbar navbar-default navbar-static-top" role="navigation">
	<div class="container">
	<div class="navbar-header">
	<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#cassandra-menu" aria-expanded="false">
	<span class="sr-only">Toggle navigation</span>
	<span class="icon-bar"></span>
	<span class="icon-bar"></span>
	<span class="icon-bar"></span>
	</button>
	<a class="navbar-brand" href="./../../../../"><img src="./../../../../img/cassandra_logo.png" alt="Apache Cassandra logo" /></a>
	</div><!-- /.navbar-header -->

	<div id="cassandra-menu" class="collapse navbar-collapse">
	<ul class="nav navbar-nav navbar-right">
	<li><a href="./../../../../">Home</a></li>
	<li><a href="./../../../../download/">Download</a></li>
	<li><a href="./../../../../doc/latest/">Documentation</a></li>
	<li><a href="./../../../../community/">Community</a></li>
	<li>
	<a href="./../../../../blog/">Blog</a>
	</li>
	</ul>
	</div><!-- /#cassandra-menu -->


	</div>
	</nav><!-- /.navbar -->
	</div><!-- /.topnav -->

	<div class="container-fluid">
	<div class="row">
	<div class="col-md-3">
	<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"><a class="reference internal" href="../../getting_started/index.html">Getting Started</a></li>
	<li class="toctree-l1"><a class="reference internal" href="../../new/index.html">New Features in Apache Cassandra 4.0</a></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="../../cql/index.html">The Cassandra Query Language (CQL)</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="../../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 current"><a class="reference internal" href="../index.html">Cassandra Tools</a><ul class="current">
	<li class="toctree-l2"><a class="reference internal" href="../cqlsh.html">cqlsh: the CQL shell</a></li>
	<li class="toctree-l2"><a class="reference internal" href="../nodetool/nodetool.html">Nodetool</a></li>
	<li class="toctree-l2"><a class="reference internal" href="../nodetool/nodetool.html#usage">Usage</a></li>
	<li class="toctree-l2 current"><a class="reference internal" href="index.html">SSTable Tools</a><ul class="current">
	<li class="toctree-l3"><a class="reference internal" href="sstabledump.html">sstabledump</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstableexpiredblockers.html">sstableexpiredblockers</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstablelevelreset.html">sstablelevelreset</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstableloader.html">sstableloader</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstablemetadata.html">sstablemetadata</a></li>
	<li class="toctree-l3 current"><a class="current reference internal" href="#">sstableofflinerelevel</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstablerepairedset.html">sstablerepairedset</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstablescrub.html">sstablescrub</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstablesplit.html">sstablesplit</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstableupgrade.html">sstableupgrade</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstableutil.html">sstableutil</a></li>
	<li class="toctree-l3"><a class="reference internal" href="sstableverify.html">sstableverify</a></li>
	</ul>
	</li>
	<li class="toctree-l2"><a class="reference internal" href="../cassandra_stress.html">Cassandra Stress</a></li>
	</ul>
	</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">Contributing to Cassandra</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="../../plugins/index.html">Third-Party Plugins</a></li>
	<li class="toctree-l1"><a class="reference internal" href="../../bugs.html">Reporting Bugs</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="content-container">

	<div class="section" id="sstableofflinerelevel">
	<h1>sstableofflinerelevel<a class="headerlink" href="#sstableofflinerelevel" title="Permalink to this headline">¶</a></h1>
	<p>When using LeveledCompactionStrategy, sstables can get stuck at L0 on a recently bootstrapped node, and compactions may never catch up. This tool is used to bump sstables into the highest level possible.</p>
	<p>ref: <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-8301">https://issues.apache.org/jira/browse/CASSANDRA-8301</a></p>
	<p>The way this is done is: sstables are storted by their last token. Given an original leveling like this (note that [ ] indicates token boundaries, not sstable size on disk; all sstables are the same size):</p>
	<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">L3</span> <span class="p">[][][][][][][][][][][]</span>
	<span class="n">L2</span> <span class="p">[</span> <span class="p">][</span> <span class="p">][</span> <span class="p">][</span> <span class="p">]</span>
	<span class="n">L1</span> <span class="p">[</span> <span class="p">][</span> <span class="p">]</span>
	<span class="n">L0</span> <span class="p">[</span> <span class="p">]</span>
	</pre></div>
	</div>
	<p>Will look like this after being dropped to L0 and sorted by last token (and, to illustrate overlap, the overlapping ones are put on a new line):</p>
	<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[][][]</span>
	<span class="p">[</span> <span class="p">][][][]</span>
	<span class="p">[</span> <span class="p">]</span>
	<span class="p">[</span> <span class="p">]</span>
	<span class="o">...</span>
	</pre></div>
	</div>
	<p>Then, we start iterating from the smallest last-token and adding all sstables that do not cause an overlap to a level. We will reconstruct the original leveling top-down. Whenever we add an sstable to the level, we remove it from the sorted list. Once we reach the end of the sorted list, we have a full level, and can start over with the level below.</p>
	<p>If we end up with more levels than expected, we put all levels exceeding the expected in L0, for example, original L0 files will most likely be put in a level of its own since they most often overlap many other sstables.</p>
	<p>Cassandra must be stopped before this tool is executed, or unexpected results will occur. Note: the script does not verify that Cassandra is stopped.</p>
	<div class="section" id="usage">
	<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
	<p>sstableofflinerelevel [–dry-run] <keyspace> <table></p>
	</div>
	<div class="section" id="doing-a-dry-run">
	<h2>Doing a dry run<a class="headerlink" href="#doing-a-dry-run" title="Permalink to this headline">¶</a></h2>
	<p>Use the –dry-run option to see the current level distribution and predicted level after the change.</p>
	<p>Example:</p>
	<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableofflinerelevel</span> <span class="o">--</span><span class="n">dry</span><span class="o">-</span><span class="n">run</span> <span class="n">keyspace</span> <span class="n">eventlog</span>
	<span class="n">For</span> <span class="n">sstables</span> <span class="ow">in</span> <span class="o">/</span><span class="n">var</span><span class="o">/</span><span class="n">lib</span><span class="o">/</span><span class="n">cassandra</span><span class="o">/</span><span class="n">data</span><span class="o">/</span><span class="n">keyspace</span><span class="o">/</span><span class="n">eventlog</span><span class="o">-</span><span class="mi">6365332094</span><span class="n">dd11e88f324f9c503e4753</span><span class="p">:</span>
	<span class="n">Current</span> <span class="n">leveling</span><span class="p">:</span>
	<span class="n">L0</span><span class="o">=</span><span class="mi">2</span>
	<span class="n">Potential</span> <span class="n">leveling</span><span class="p">:</span>
	<span class="n">L0</span><span class="o">=</span><span class="mi">1</span>
	<span class="n">L1</span><span class="o">=</span><span class="mi">1</span>
	</pre></div>
	</div>
	</div>
	<div class="section" id="running-a-relevel">
	<h2>Running a relevel<a class="headerlink" href="#running-a-relevel" title="Permalink to this headline">¶</a></h2>
	<p>Example:</p>
	<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableofflinerelevel</span> <span class="n">keyspace</span> <span class="n">eventlog</span>
	<span class="n">For</span> <span class="n">sstables</span> <span class="ow">in</span> <span class="o">/</span><span class="n">var</span><span class="o">/</span><span class="n">lib</span><span class="o">/</span><span class="n">cassandra</span><span class="o">/</span><span class="n">data</span><span class="o">/</span><span class="n">keyspace</span><span class="o">/</span><span class="n">eventlog</span><span class="o">-</span><span class="mi">6365332094</span><span class="n">dd11e88f324f9c503e4753</span><span class="p">:</span>
	<span class="n">Current</span> <span class="n">leveling</span><span class="p">:</span>
	<span class="n">L0</span><span class="o">=</span><span class="mi">2</span>
	<span class="n">New</span> <span class="n">leveling</span><span class="p">:</span>
	<span class="n">L0</span><span class="o">=</span><span class="mi">1</span>
	<span class="n">L1</span><span class="o">=</span><span class="mi">1</span>
	</pre></div>
	</div>
	</div>
	<div class="section" id="keyspace-or-table-not-found">
	<h2>Keyspace or table not found<a class="headerlink" href="#keyspace-or-table-not-found" title="Permalink to this headline">¶</a></h2>
	<p>If an invalid keyspace and/or table is provided, an exception will be thrown.</p>
	<p>Example:</p>
	<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableofflinerelevel</span> <span class="o">--</span><span class="n">dry</span><span class="o">-</span><span class="n">run</span> <span class="n">keyspace</span> <span class="n">evenlog</span>

	<span class="ne">Exception</span> <span class="ow">in</span> <span class="n">thread</span> <span class="s2">"main"</span> <span class="n">java</span><span class="o">.</span><span class="n">lang</span><span class="o">.</span><span class="n">IllegalArgumentException</span><span class="p">:</span> <span class="n">Unknown</span> <span class="n">keyspace</span><span class="o">/</span><span class="n">columnFamily</span> <span class="n">keyspace1</span><span class="o">.</span><span class="n">evenlog</span>
	<span class="n">at</span> <span class="n">org</span><span class="o">.</span><span class="n">apache</span><span class="o">.</span><span class="n">cassandra</span><span class="o">.</span><span class="n">tools</span><span class="o">.</span><span class="n">SSTableOfflineRelevel</span><span class="o">.</span><span class="n">main</span><span class="p">(</span><span class="n">SSTableOfflineRelevel</span><span class="o">.</span><span class="n">java</span><span class="p">:</span><span class="mi">96</span><span class="p">)</span>
	</pre></div>
	</div>
	</div>
	</div>




	<div class="doc-prev-next-links" role="navigation" aria-label="footer navigation">

	<a href="sstablerepairedset.html" class="btn btn-default pull-right " role="button" title="sstablerepairedset" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a>


	<a href="sstablemetadata.html" class="btn btn-default" role="button" title="sstablemetadata" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a>

	</div>

	</div>
	</div>
	</div>
	</div>
	</div>

	<hr />

	<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>
	<a class="subscribe-rss icon-link" href="/feed.xml" title="Subscribe to Blog via RSS">
	<span><i class="fa fa-rss"></i></span>
	</a>
	</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. Placed here so pages load faster -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
	<script src="./../../../../js/underscore-min.js"></script>
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>


	<script src="./../../../../js/doctools.js"></script>
	<script src="./../../../../js/searchtools.js"></script>

	<script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: "", VERSION: "", COLLAPSE_INDEX: false, FILE_SUFFIX: ".html", HAS_SOURCE: false, SOURCELINK_SUFFIX: ".txt" }; </script>



	<script type="text/javascript">
	var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
	document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));

	try {
	var pageTracker = _gat._getTracker("UA-11583863-1");
	pageTracker._trackPageview();
	} catch(err) {}
	</script>


	</body>
	</html>