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  <div class="section" id="sstablelevelreset">
<h1>sstablelevelreset<a class="headerlink" href="#sstablelevelreset" title="Permalink to this headline">¶</a></h1>
<p>If LeveledCompactionStrategy is set, this script can be used to reset level to 0 on a given set of sstables. This is useful if you want to, for example, change the minimum sstable size, and therefore restart the compaction process using this new configuration.</p>
<p>See <a class="reference external" href="http://cassandra.apache.org/doc/latest/operating/compaction.html#leveled-compaction-strategy">http://cassandra.apache.org/doc/latest/operating/compaction.html#leveled-compaction-strategy</a> for information on how levels are used in this compaction strategy.</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>
<p>ref: <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-5271">https://issues.apache.org/jira/browse/CASSANDRA-5271</a></p>
<div class="section" id="usage">
<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>sstablelevelreset –really-reset &lt;keyspace&gt; &lt;table&gt;</p>
<p>The really-reset flag is required, to ensure this intrusive command is not run accidentally.</p>
</div>
<div class="section" id="table-not-found">
<h2>Table not found<a class="headerlink" href="#table-not-found" title="Permalink to this headline">¶</a></h2>
<p>If the keyspace and/or table is not in the schema (e.g., if you misspelled the table name), the script will return an error.</p>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ColumnFamily</span> <span class="ow">not</span> <span class="n">found</span><span class="p">:</span> <span class="n">keyspace</span><span class="o">/</span><span class="n">evenlog</span><span class="o">.</span>
</pre></div>
</div>
</div>
<div class="section" id="table-has-no-sstables">
<h2>Table has no sstables<a class="headerlink" href="#table-has-no-sstables" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>Found no sstables, did you give the correct keyspace/table?
</pre></div>
</div>
</div>
<div class="section" id="table-already-at-level-0">
<h2>Table already at level 0<a class="headerlink" href="#table-already-at-level-0" title="Permalink to this headline">¶</a></h2>
<p>The script will not set the level if it is already set to 0.</p>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Skipped</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">65</span><span class="n">c429e08c5a11e8939edf4f403979ef</span><span class="o">/</span><span class="n">mc</span><span class="o">-</span><span class="mi">1</span><span class="o">-</span><span class="n">big</span><span class="o">-</span><span class="n">Data</span><span class="o">.</span><span class="n">db</span> <span class="n">since</span> <span class="n">it</span> <span class="ow">is</span> <span class="n">already</span> <span class="n">on</span> <span class="n">level</span> <span class="mi">0</span>
</pre></div>
</div>
</div>
<div class="section" id="table-levels-reduced-to-0">
<h2>Table levels reduced to 0<a class="headerlink" href="#table-levels-reduced-to-0" title="Permalink to this headline">¶</a></h2>
<p>If the level is not already 0, then this will reset it to 0.</p>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstablemetadata</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="o">/</span><span class="n">mc</span><span class="o">-</span><span class="mi">8</span><span class="o">-</span><span class="n">big</span><span class="o">-</span><span class="n">Data</span><span class="o">.</span><span class="n">db</span> <span class="o">|</span> <span class="n">grep</span> <span class="o">-</span><span class="n">i</span> <span class="n">level</span>
<span class="n">SSTable</span> <span class="n">Level</span><span class="p">:</span> <span class="mi">1</span>

<span class="n">sstablelevelreset</span> <span class="o">--</span><span class="n">really</span><span class="o">-</span><span class="n">reset</span> <span class="n">keyspace</span> <span class="n">eventlog</span>
<span class="n">Changing</span> <span class="n">level</span> <span class="kn">from</span> <span class="mi">1</span> <span class="n">to</span> <span class="mi">0</span> <span class="n">on</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="o">/</span><span class="n">mc</span><span class="o">-</span><span class="mi">8</span><span class="o">-</span><span class="n">big</span><span class="o">-</span><span class="n">Data</span><span class="o">.</span><span class="n">db</span>

<span class="n">sstablemetadata</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="o">/</span><span class="n">mc</span><span class="o">-</span><span class="mi">8</span><span class="o">-</span><span class="n">big</span><span class="o">-</span><span class="n">Data</span><span class="o">.</span><span class="n">db</span> <span class="o">|</span> <span class="n">grep</span> <span class="o">-</span><span class="n">i</span> <span class="n">level</span>
<span class="n">SSTable</span> <span class="n">Level</span><span class="p">:</span> <span class="mi">0</span>
</pre></div>
</div>
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