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<div class="section" id="logback-xml-file">
<span id="cassandra-logback-xml"></span><h1>logback.xml file<a class="headerlink" href="#logback-xml-file" title="Permalink to this headline"></a></h1>
<p>The <code class="docutils literal notranslate"><span class="pre">logback.xml</span></code> configuration file can optionally set logging levels for the logs written to <code class="docutils literal notranslate"><span class="pre">system.log</span></code> and <code class="docutils literal notranslate"><span class="pre">debug.log</span></code>. The logging levels can also be set using <code class="docutils literal notranslate"><span class="pre">nodetool</span> <span class="pre">setlogginglevels</span></code>.</p>
<div class="section" id="options">
<h2>Options<a class="headerlink" href="#options" title="Permalink to this headline"></a></h2>
<div class="section" id="appender-name-appender-choice-appender">
<h3><code class="docutils literal notranslate"><span class="pre">appender</span> <span class="pre">name=&quot;&lt;appender_choice&gt;&quot;...&lt;/appender&gt;</span></code><a class="headerlink" href="#appender-name-appender-choice-appender" title="Permalink to this headline"></a></h3>
<p>Specify log type and settings. Possible appender names are: <code class="docutils literal notranslate"><span class="pre">SYSTEMLOG</span></code>, <code class="docutils literal notranslate"><span class="pre">DEBUGLOG</span></code>, <code class="docutils literal notranslate"><span class="pre">ASYNCDEBUGLOG</span></code>, and <code class="docutils literal notranslate"><span class="pre">STDOUT</span></code>. <code class="docutils literal notranslate"><span class="pre">SYSTEMLOG</span></code> ensures that WARN and ERROR message are written synchronously to the specified file. <code class="docutils literal notranslate"><span class="pre">DEBUGLOG</span></code> and <code class="docutils literal notranslate"><span class="pre">ASYNCDEBUGLOG</span></code> ensure that DEBUG messages are written either synchronously or asynchronously, respectively, to the specified file. <code class="docutils literal notranslate"><span class="pre">STDOUT</span></code> writes all messages to the console in a human-readable format.</p>
<p><strong>Example:</strong> &lt;appender name=”SYSTEMLOG” class=”ch.qos.logback.core.rolling.RollingFileAppender”&gt;</p>
</div>
<div class="section" id="file-filename-file">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;file&gt;</span> <span class="pre">&lt;filename&gt;</span> <span class="pre">&lt;/file&gt;</span></code><a class="headerlink" href="#file-filename-file" title="Permalink to this headline"></a></h3>
<p>Specify the filename for a log.</p>
<p><strong>Example:</strong> &lt;file&gt;${cassandra.logdir}/system.log&lt;/file&gt;</p>
</div>
<div class="section" id="level-log-level-level">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;level&gt;</span> <span class="pre">&lt;log_level&gt;</span> <span class="pre">&lt;/level&gt;</span></code><a class="headerlink" href="#level-log-level-level" title="Permalink to this headline"></a></h3>
<p>Specify the level for a log. Part of the filter. Levels are: <code class="docutils literal notranslate"><span class="pre">ALL</span></code>, <code class="docutils literal notranslate"><span class="pre">TRACE</span></code>, <code class="docutils literal notranslate"><span class="pre">DEBUG</span></code>, <code class="docutils literal notranslate"><span class="pre">INFO</span></code>, <code class="docutils literal notranslate"><span class="pre">WARN</span></code>, <code class="docutils literal notranslate"><span class="pre">ERROR</span></code>, <code class="docutils literal notranslate"><span class="pre">OFF</span></code>. <code class="docutils literal notranslate"><span class="pre">TRACE</span></code> creates the most verbose log, <code class="docutils literal notranslate"><span class="pre">ERROR</span></code> the least.</p>
<p>Note: Increasing logging levels can generate heavy logging output on a moderately trafficked cluster.
You can use the <code class="docutils literal notranslate"><span class="pre">nodetool</span> <span class="pre">getlogginglevels</span></code> command to see the current logging configuration.</p>
<p><strong>Default:</strong> INFO</p>
<p><strong>Example:</strong> &lt;level&gt;INFO&lt;/level&gt;</p>
</div>
<div class="section" id="rollingpolicy-class-rolling-policy-choice-filenamepattern-pattern-info-filenamepattern-rollingpolicy">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;rollingPolicy</span> <span class="pre">class=&quot;&lt;rolling_policy_choice&gt;&quot;</span> <span class="pre">&lt;fileNamePattern&gt;&lt;pattern_info&gt;&lt;/fileNamePattern&gt;</span> <span class="pre">...</span> <span class="pre">&lt;/rollingPolicy&gt;</span></code><a class="headerlink" href="#rollingpolicy-class-rolling-policy-choice-filenamepattern-pattern-info-filenamepattern-rollingpolicy" title="Permalink to this headline"></a></h3>
<p>Specify the policy for rolling logs over to an archive.</p>
<p><strong>Example:</strong> &lt;rollingPolicy class=”ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy”&gt;</p>
</div>
<div class="section" id="filenamepattern-pattern-info-filenamepattern">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;fileNamePattern&gt;</span> <span class="pre">&lt;pattern_info&gt;</span> <span class="pre">&lt;/fileNamePattern&gt;</span></code><a class="headerlink" href="#filenamepattern-pattern-info-filenamepattern" title="Permalink to this headline"></a></h3>
<p>Specify the pattern information for rolling over the log to archive. Part of the rolling policy.</p>
<p><strong>Example:</strong> &lt;fileNamePattern&gt;${cassandra.logdir}/system.log.%d{yyyy-MM-dd}.%i.zip&lt;/fileNamePattern&gt;</p>
</div>
<div class="section" id="maxfilesize-size-maxfilesize">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;maxFileSize&gt;</span> <span class="pre">&lt;size&gt;</span> <span class="pre">&lt;/maxFileSize&gt;</span></code><a class="headerlink" href="#maxfilesize-size-maxfilesize" title="Permalink to this headline"></a></h3>
<p>Specify the maximum file size to trigger rolling a log. Part of the rolling policy.</p>
<p><strong>Example:</strong> &lt;maxFileSize&gt;50MB&lt;/maxFileSize&gt;</p>
</div>
<div class="section" id="maxhistory-number-of-days-maxhistory">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;maxHistory&gt;</span> <span class="pre">&lt;number_of_days&gt;</span> <span class="pre">&lt;/maxHistory&gt;</span></code><a class="headerlink" href="#maxhistory-number-of-days-maxhistory" title="Permalink to this headline"></a></h3>
<p>Specify the maximum history in days to trigger rolling a log. Part of the rolling policy.</p>
<p><strong>Example:</strong> &lt;maxHistory&gt;7&lt;/maxHistory&gt;</p>
</div>
<div class="section" id="encoder-pattern-pattern-encoder">
<h3><code class="docutils literal notranslate"><span class="pre">&lt;encoder&gt;</span> <span class="pre">&lt;pattern&gt;...&lt;/pattern&gt;</span> <span class="pre">&lt;/encoder&gt;</span></code><a class="headerlink" href="#encoder-pattern-pattern-encoder" title="Permalink to this headline"></a></h3>
<p>Specify the format of the message. Part of the rolling policy.</p>
<p><strong>Example:</strong> &lt;maxHistory&gt;7&lt;/maxHistory&gt;
<strong>Example:</strong> &lt;encoder&gt; &lt;pattern&gt;%-5level [%thread] %date{ISO8601} %F:%L - %msg%n&lt;/pattern&gt; &lt;/encoder&gt;</p>
</div>
<div class="section" id="contents-of-default-logback-xml">
<h3>Contents of default <code class="docutils literal notranslate"><span class="pre">logback.xml</span></code><a class="headerlink" href="#contents-of-default-logback-xml" title="Permalink to this headline"></a></h3>
<div class="highlight-XML notranslate"><div class="highlight"><pre><span></span> <span class="nt">&lt;configuration</span> <span class="na">scan=</span><span class="s">&quot;true&quot;</span> <span class="na">scanPeriod=</span><span class="s">&quot;60 seconds&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;jmxConfigurator</span> <span class="nt">/&gt;</span>
<span class="c">&lt;!-- No shutdown hook; we run it ourselves in StorageService after shutdown --&gt;</span>
<span class="c">&lt;!-- SYSTEMLOG rolling file appender to system.log (INFO level) --&gt;</span>
<span class="nt">&lt;appender</span> <span class="na">name=</span><span class="s">&quot;SYSTEMLOG&quot;</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.core.rolling.RollingFileAppender&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;filter</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.classic.filter.ThresholdFilter&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;level&gt;</span>INFO<span class="nt">&lt;/level&gt;</span>
<span class="nt">&lt;/filter&gt;</span>
<span class="nt">&lt;file&gt;</span>${cassandra.logdir}/system.log<span class="nt">&lt;/file&gt;</span>
<span class="nt">&lt;rollingPolicy</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy&quot;</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- rollover daily --&gt;</span>
<span class="nt">&lt;fileNamePattern&gt;</span>${cassandra.logdir}/system.log.%d{yyyy-MM-dd}.%i.zip<span class="nt">&lt;/fileNamePattern&gt;</span>
<span class="c">&lt;!-- each file should be at most 50MB, keep 7 days worth of history, but at most 5GB --&gt;</span>
<span class="nt">&lt;maxFileSize&gt;</span>50MB<span class="nt">&lt;/maxFileSize&gt;</span>
<span class="nt">&lt;maxHistory&gt;</span>7<span class="nt">&lt;/maxHistory&gt;</span>
<span class="nt">&lt;totalSizeCap&gt;</span>5GB<span class="nt">&lt;/totalSizeCap&gt;</span>
<span class="nt">&lt;/rollingPolicy&gt;</span>
<span class="nt">&lt;encoder&gt;</span>
<span class="nt">&lt;pattern&gt;</span>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n<span class="nt">&lt;/pattern&gt;</span>
<span class="nt">&lt;/encoder&gt;</span>
<span class="nt">&lt;/appender&gt;</span>
<span class="c">&lt;!-- DEBUGLOG rolling file appender to debug.log (all levels) --&gt;</span>
<span class="nt">&lt;appender</span> <span class="na">name=</span><span class="s">&quot;DEBUGLOG&quot;</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.core.rolling.RollingFileAppender&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;file&gt;</span>${cassandra.logdir}/debug.log<span class="nt">&lt;/file&gt;</span>
<span class="nt">&lt;rollingPolicy</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy&quot;</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- rollover daily --&gt;</span>
<span class="nt">&lt;fileNamePattern&gt;</span>${cassandra.logdir}/debug.log.%d{yyyy-MM-dd}.%i.zip<span class="nt">&lt;/fileNamePattern&gt;</span>
<span class="c">&lt;!-- each file should be at most 50MB, keep 7 days worth of history, but at most 5GB --&gt;</span>
<span class="nt">&lt;maxFileSize&gt;</span>50MB<span class="nt">&lt;/maxFileSize&gt;</span>
<span class="nt">&lt;maxHistory&gt;</span>7<span class="nt">&lt;/maxHistory&gt;</span>
<span class="nt">&lt;totalSizeCap&gt;</span>5GB<span class="nt">&lt;/totalSizeCap&gt;</span>
<span class="nt">&lt;/rollingPolicy&gt;</span>
<span class="nt">&lt;encoder&gt;</span>
<span class="nt">&lt;pattern&gt;</span>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n<span class="nt">&lt;/pattern&gt;</span>
<span class="nt">&lt;/encoder&gt;</span>
<span class="nt">&lt;/appender&gt;</span>
<span class="c">&lt;!-- ASYNCLOG assynchronous appender to debug.log (all levels) --&gt;</span>
<span class="nt">&lt;appender</span> <span class="na">name=</span><span class="s">&quot;ASYNCDEBUGLOG&quot;</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.classic.AsyncAppender&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;queueSize&gt;</span>1024<span class="nt">&lt;/queueSize&gt;</span>
<span class="nt">&lt;discardingThreshold&gt;</span>0<span class="nt">&lt;/discardingThreshold&gt;</span>
<span class="nt">&lt;includeCallerData&gt;</span>true<span class="nt">&lt;/includeCallerData&gt;</span>
<span class="nt">&lt;appender-ref</span> <span class="na">ref=</span><span class="s">&quot;DEBUGLOG&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/appender&gt;</span>
<span class="c">&lt;!-- STDOUT console appender to stdout (INFO level) --&gt;</span>
<span class="nt">&lt;appender</span> <span class="na">name=</span><span class="s">&quot;STDOUT&quot;</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.core.ConsoleAppender&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;filter</span> <span class="na">class=</span><span class="s">&quot;ch.qos.logback.classic.filter.ThresholdFilter&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;level&gt;</span>INFO<span class="nt">&lt;/level&gt;</span>
<span class="nt">&lt;/filter&gt;</span>
<span class="nt">&lt;encoder&gt;</span>
<span class="nt">&lt;pattern&gt;</span>%-5level [%thread] %date{ISO8601} %F:%L - %msg%n<span class="nt">&lt;/pattern&gt;</span>
<span class="nt">&lt;/encoder&gt;</span>
<span class="nt">&lt;/appender&gt;</span>
<span class="c">&lt;!-- Uncomment bellow and corresponding appender-ref to activate logback metrics</span>
<span class="c"> &lt;appender name=&quot;LogbackMetrics&quot; class=&quot;com.codahale.metrics.logback.InstrumentedAppender&quot; /&gt;</span>
<span class="c"> --&gt;</span>
<span class="nt">&lt;root</span> <span class="na">level=</span><span class="s">&quot;INFO&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;appender-ref</span> <span class="na">ref=</span><span class="s">&quot;SYSTEMLOG&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;appender-ref</span> <span class="na">ref=</span><span class="s">&quot;STDOUT&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;appender-ref</span> <span class="na">ref=</span><span class="s">&quot;ASYNCDEBUGLOG&quot;</span> <span class="nt">/&gt;</span> <span class="c">&lt;!-- Comment this line to disable debug.log --&gt;</span>
<span class="c">&lt;!--</span>
<span class="c"> &lt;appender-ref ref=&quot;LogbackMetrics&quot; /&gt;</span>
<span class="c"> --&gt;</span>
<span class="nt">&lt;/root&gt;</span>
<span class="nt">&lt;logger</span> <span class="na">name=</span><span class="s">&quot;org.apache.cassandra&quot;</span> <span class="na">level=</span><span class="s">&quot;DEBUG&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;logger</span> <span class="na">name=</span><span class="s">&quot;com.thinkaurelius.thrift&quot;</span> <span class="na">level=</span><span class="s">&quot;ERROR&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
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