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  <div class="section" id="sstableexpiredblockers">
<h1>sstableexpiredblockers<a class="headerlink" href="#sstableexpiredblockers" title="Permalink to this headline">¶</a></h1>
<p>During compaction, entire sstables can be dropped if they contain only expired tombstones, and if it is guaranteed that the data is not newer than the data in other sstables. An expired sstable can be blocked from getting dropped if its newest timestamp is newer than the oldest data in another sstable.</p>
<p>This tool is used to list all sstables that are blocking other sstables from getting dropped (by having older data than the newest tombstone in an expired sstable) so a user can figure out why certain sstables are still on disk.</p>
<p>ref: <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-10015">https://issues.apache.org/jira/browse/CASSANDRA-10015</a></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>sstableexpiredblockers &lt;keyspace&gt; &lt;table&gt;</p>
</div>
<div class="section" id="output-blocked-sstables">
<h2>Output blocked sstables<a class="headerlink" href="#output-blocked-sstables" title="Permalink to this headline">¶</a></h2>
<p>If the sstables exist for the table, but no tables have older data than the newest tombstone in an expired sstable, the script will return nothing.</p>
<p>Otherwise, the script will return <cite>&lt;sstable&gt; blocks &lt;#&gt; expired sstables from getting dropped</cite> followed by a list of the blocked sstables.</p>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sstableexpiredblockers</span> <span class="n">keyspace1</span> <span class="n">standard1</span>

<span class="p">[</span><span class="n">BigTableReader</span><span class="p">(</span><span class="n">path</span><span class="o">=</span><span class="s1">&#39;/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-2-big-Data.db&#39;</span><span class="p">)</span> <span class="p">(</span><span class="n">minTS</span> <span class="o">=</span> <span class="mi">5</span><span class="p">,</span> <span class="n">maxTS</span> <span class="o">=</span> <span class="mi">5</span><span class="p">,</span> <span class="n">maxLDT</span> <span class="o">=</span> <span class="mi">2147483647</span><span class="p">)],</span>  <span class="n">blocks</span> <span class="mi">1</span> <span class="n">expired</span> <span class="n">sstables</span> <span class="kn">from</span> <span class="nn">getting</span> <span class="n">dropped</span><span class="p">:</span> <span class="p">[</span><span class="n">BigTableReader</span><span class="p">(</span><span class="n">path</span><span class="o">=</span><span class="s1">&#39;/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-3-big-Data.db&#39;</span><span class="p">)</span> <span class="p">(</span><span class="n">minTS</span> <span class="o">=</span> <span class="mi">1536349775157606</span><span class="p">,</span> <span class="n">maxTS</span> <span class="o">=</span> <span class="mi">1536349780311159</span><span class="p">,</span> <span class="n">maxLDT</span> <span class="o">=</span> <span class="mi">1536349780</span><span class="p">)],</span>

<span class="p">[</span><span class="n">BigTableReader</span><span class="p">(</span><span class="n">path</span><span class="o">=</span><span class="s1">&#39;/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-1-big-Data.db&#39;</span><span class="p">)</span> <span class="p">(</span><span class="n">minTS</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="n">maxTS</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span> <span class="n">maxLDT</span> <span class="o">=</span> <span class="mi">2147483647</span><span class="p">)],</span>  <span class="n">blocks</span> <span class="mi">1</span> <span class="n">expired</span> <span class="n">sstables</span> <span class="kn">from</span> <span class="nn">getting</span> <span class="n">dropped</span><span class="p">:</span> <span class="p">[</span><span class="n">BigTableReader</span><span class="p">(</span><span class="n">path</span><span class="o">=</span><span class="s1">&#39;/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-3-big-Data.db&#39;</span><span class="p">)</span> <span class="p">(</span><span class="n">minTS</span> <span class="o">=</span> <span class="mi">1536349775157606</span><span class="p">,</span> <span class="n">maxTS</span> <span class="o">=</span> <span class="mi">1536349780311159</span><span class="p">,</span> <span class="n">maxLDT</span> <span class="o">=</span> <span class="mi">1536349780</span><span class="p">)],</span>
</pre></div>
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