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<article class="doc">
<h1 class="page">logback.xml file</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>The <code>logback.xml</code> configuration file can optionally set logging levels
for the logs written to <code>system.log</code> and <code>debug.log</code>. The logging levels
can also be set using <code>nodetool setlogginglevels</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="options"><a class="anchor" href="#options"></a>Options</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="appender-nameappender_choiceappender"><a class="anchor" href="#appender-nameappender_choiceappender"></a><code>appender name="&lt;appender_choice&gt;"&#8230;&#8203;&lt;/appender&gt;</code></h3>
<div class="paragraph">
<p>Specify log type and settings. Possible appender names are: <code>SYSTEMLOG</code>,
<code>DEBUGLOG</code>, <code>ASYNCDEBUGLOG</code>, and <code>STDOUT</code>. <code>SYSTEMLOG</code> ensures that WARN
and ERROR message are written synchronously to the specified file.
<code>DEBUGLOG</code> and <code>ASYNCDEBUGLOG</code> ensure that DEBUG messages are written
either synchronously or asynchronously, respectively, to the specified
file. <code>STDOUT</code> writes all messages to the console in a human-readable
format.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong> &lt;appender name="SYSTEMLOG"
class="ch.qos.logback.core.rolling.RollingFileAppender"&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="file-filename-file"><a class="anchor" href="#file-filename-file"></a><code>&lt;file&gt; &lt;filename&gt; &lt;/file&gt;</code></h3>
<div class="paragraph">
<p>Specify the filename for a log.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong> &lt;file&gt;$\{cassandra.logdir}/system.log&lt;/file&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="level-log_level-level"><a class="anchor" href="#level-log_level-level"></a><code>&lt;level&gt; &lt;log_level&gt; &lt;/level&gt;</code></h3>
<div class="paragraph">
<p>Specify the level for a log. Part of the filter. Levels are: <code>ALL</code>,
<code>TRACE</code>, <code>DEBUG</code>, <code>INFO</code>, <code>WARN</code>, <code>ERROR</code>, <code>OFF</code>. <code>TRACE</code> creates the
most verbose log, <code>ERROR</code> the least.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
<div class="title">Note</div>
<div class="paragraph">
<p>Note: Increasing logging levels can generate heavy logging output on
a moderately trafficked cluster. You can use the
<code>nodetool getlogginglevels</code> command to see the current logging
configuration.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p><strong>Default:</strong> INFO</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong> &lt;level&gt;INFO&lt;/level&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="rollingpolicy-classrolling_policy_choice-filenamepatternpattern_infofilenamepattern-rollingpolicy"><a class="anchor" href="#rollingpolicy-classrolling_policy_choice-filenamepatternpattern_infofilenamepattern-rollingpolicy"></a><code>&lt;rollingPolicy class="&lt;rolling_policy_choice&gt;" &lt;fileNamePattern&gt;&lt;pattern_info&gt;&lt;/fileNamePattern&gt; &#8230;&#8203; &lt;/rollingPolicy&gt;</code></h3>
<div class="paragraph">
<p>Specify the policy for rolling logs over to an archive.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong> &lt;rollingPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy"&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="filenamepattern-pattern_info-filenamepattern"><a class="anchor" href="#filenamepattern-pattern_info-filenamepattern"></a><code>&lt;fileNamePattern&gt; &lt;pattern_info&gt; &lt;/fileNamePattern&gt;</code></h3>
<div class="paragraph">
<p>Specify the pattern information for rolling over the log to archive.
Part of the rolling policy.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong>
&lt;fileNamePattern&gt;$\{cassandra.logdir}/system.log.%d{yyyy-MM-dd}.%i.zip&lt;/fileNamePattern&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="maxfilesize-size-maxfilesize"><a class="anchor" href="#maxfilesize-size-maxfilesize"></a><code>&lt;maxFileSize&gt; &lt;size&gt; &lt;/maxFileSize&gt;</code></h3>
<div class="paragraph">
<p>Specify the maximum file size to trigger rolling a log. Part of the
rolling policy.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong> &lt;maxFileSize&gt;50MB&lt;/maxFileSize&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="maxhistory-number_of_days-maxhistory"><a class="anchor" href="#maxhistory-number_of_days-maxhistory"></a><code>&lt;maxHistory&gt; &lt;number_of_days&gt; &lt;/maxHistory&gt;</code></h3>
<div class="paragraph">
<p>Specify the maximum history in days to trigger rolling a log. Part of
the rolling policy.</p>
</div>
<div class="paragraph">
<p><strong>Example:</strong> &lt;maxHistory&gt;7&lt;/maxHistory&gt;</p>
</div>
</div>
<div class="sect2">
<h3 id="encoder-patternpattern-encoder"><a class="anchor" href="#encoder-patternpattern-encoder"></a><code>&lt;encoder&gt; &lt;pattern&gt;&#8230;&#8203;&lt;/pattern&gt; &lt;/encoder&gt;</code></h3>
<div class="paragraph">
<p>Specify the format of the message. Part of the rolling policy.</p>
</div>
<div class="paragraph">
<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>
<div class="sect2">
<h3 id="contents-of-default-logback-xml"><a class="anchor" href="#contents-of-default-logback-xml"></a>Contents of default <code>logback.xml</code></h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-XML hljs" data-lang="XML">&lt;configuration scan="true" scanPeriod="60 seconds"&gt;
&lt;jmxConfigurator /&gt;
&lt;!-- No shutdown hook; we run it ourselves in StorageService after shutdown --&gt;
&lt;!-- SYSTEMLOG rolling file appender to system.log (INFO level) --&gt;
&lt;appender name="SYSTEMLOG" class="ch.qos.logback.core.rolling.RollingFileAppender"&gt;
&lt;filter class="ch.qos.logback.classic.filter.ThresholdFilter"&gt;
&lt;level&gt;INFO&lt;/level&gt;
&lt;/filter&gt;
&lt;file&gt;${cassandra.logdir}/system.log&lt;/file&gt;
&lt;rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy"&gt;
&lt;!-- rollover daily --&gt;
&lt;fileNamePattern&gt;${cassandra.logdir}/system.log.%d{yyyy-MM-dd}.%i.zip&lt;/fileNamePattern&gt;
&lt;!-- each file should be at most 50MB, keep 7 days worth of history, but at most 5GB --&gt;
&lt;maxFileSize&gt;50MB&lt;/maxFileSize&gt;
&lt;maxHistory&gt;7&lt;/maxHistory&gt;
&lt;totalSizeCap&gt;5GB&lt;/totalSizeCap&gt;
&lt;/rollingPolicy&gt;
&lt;encoder&gt;
&lt;pattern&gt;%-5level [%thread] %date{ISO8601} %F:%L - %msg%n&lt;/pattern&gt;
&lt;/encoder&gt;
&lt;/appender&gt;
&lt;!-- DEBUGLOG rolling file appender to debug.log (all levels) --&gt;
&lt;appender name="DEBUGLOG" class="ch.qos.logback.core.rolling.RollingFileAppender"&gt;
&lt;file&gt;${cassandra.logdir}/debug.log&lt;/file&gt;
&lt;rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy"&gt;
&lt;!-- rollover daily --&gt;
&lt;fileNamePattern&gt;${cassandra.logdir}/debug.log.%d{yyyy-MM-dd}.%i.zip&lt;/fileNamePattern&gt;
&lt;!-- each file should be at most 50MB, keep 7 days worth of history, but at most 5GB --&gt;
&lt;maxFileSize&gt;50MB&lt;/maxFileSize&gt;
&lt;maxHistory&gt;7&lt;/maxHistory&gt;
&lt;totalSizeCap&gt;5GB&lt;/totalSizeCap&gt;
&lt;/rollingPolicy&gt;
&lt;encoder&gt;
&lt;pattern&gt;%-5level [%thread] %date{ISO8601} %F:%L - %msg%n&lt;/pattern&gt;
&lt;/encoder&gt;
&lt;/appender&gt;
&lt;!-- ASYNCLOG assynchronous appender to debug.log (all levels) --&gt;
&lt;appender name="ASYNCDEBUGLOG" class="ch.qos.logback.classic.AsyncAppender"&gt;
&lt;queueSize&gt;1024&lt;/queueSize&gt;
&lt;discardingThreshold&gt;0&lt;/discardingThreshold&gt;
&lt;includeCallerData&gt;true&lt;/includeCallerData&gt;
&lt;appender-ref ref="DEBUGLOG" /&gt;
&lt;/appender&gt;
&lt;!-- STDOUT console appender to stdout (INFO level) --&gt;
&lt;appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"&gt;
&lt;filter class="ch.qos.logback.classic.filter.ThresholdFilter"&gt;
&lt;level&gt;INFO&lt;/level&gt;
&lt;/filter&gt;
&lt;encoder&gt;
&lt;pattern&gt;%-5level [%thread] %date{ISO8601} %F:%L - %msg%n&lt;/pattern&gt;
&lt;/encoder&gt;
&lt;/appender&gt;
&lt;!-- Uncomment bellow and corresponding appender-ref to activate logback metrics
&lt;appender name="LogbackMetrics" class="com.codahale.metrics.logback.InstrumentedAppender" /&gt;
--&gt;
&lt;root level="INFO"&gt;
&lt;appender-ref ref="SYSTEMLOG" /&gt;
&lt;appender-ref ref="STDOUT" /&gt;
&lt;appender-ref ref="ASYNCDEBUGLOG" /&gt; &lt;!-- Comment this line to disable debug.log --&gt;
&lt;!--
&lt;appender-ref ref="LogbackMetrics" /&gt;
--&gt;
&lt;/root&gt;
&lt;logger name="org.apache.cassandra" level="DEBUG"/&gt;
&lt;logger name="com.thinkaurelius.thrift" level="ERROR"/&gt;
&lt;/configuration&gt;</code></pre>
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