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POLogback file appender doesn't flush immediately
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  1. POLogback file appender doesn't flush immediately
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    copied!<p>For some circumstances I need to force flushing in logback's file appender immediately. I've found in <a href="http://logback.qos.ch/manual/encoders.html#PatternLayoutEncoder" rel="nofollow noreferrer">docs</a> this option is enabled by default. Mysteriously this doesn't work. As I see in the sources underlying process involves <code>BufferedOutputSream</code> correctly. Is there any issues with <code>BufferedOutputSream.flush()</code> ? Probably this is rather related to the flushing issue.</p> <p><strong>Update</strong>: I found the issue on Windows XP Pro SP 3 and on Red Hat Enterprise Linux Server release 5.3 (Tikanga). I used these libs:</p> <pre><code>jcl-over-slf4j-1.6.6.jar logback-classic-1.0.6.jar logback-core-1.0.6.jar slf4j-api-1.6.6.jar </code></pre> <p>The <code>logback.xml</code> is:</p> <pre><code>&lt;configuration&gt; &lt;appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"&gt; &lt;file&gt;/somepath/file.log&lt;/file&gt; &lt;rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"&gt; &lt;fileNamePattern&gt;file.log.%i&lt;/fileNamePattern&gt; &lt;minIndex&gt;1&lt;/minIndex&gt; &lt;maxIndex&gt;3&lt;/maxIndex&gt; &lt;/rollingPolicy&gt; &lt;triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"&gt; &lt;maxFileSize&gt;5MB&lt;/maxFileSize&gt; &lt;/triggeringPolicy&gt; &lt;encoder&gt; &lt;pattern&gt;%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n&lt;/pattern&gt; &lt;/encoder&gt; &lt;/appender&gt; &lt;root level="debug"&gt; &lt;appender-ref ref="FILE"/&gt; &lt;/root&gt; &lt;/configuration&gt; </code></pre> <p><strong>Updated:</strong> I'd provide a unit test but that seems not so simple. Let me describe the issue more clearly.</p> <ol> <li>Event of logging occurred</li> <li>Event is passed into file appender</li> <li>Event is serialized with defined pattern</li> <li>Serialized message of event is passed to the file appender and is about to write out to output stream</li> <li>Writing to the stream is finished, output stream is flushed (I've checked the implementation). Note that <code>immidiateFlush</code> is true by default so method <code>flush()</code> is invoked explicitly</li> <li>No result in the file!</li> </ol> <p>A bit later when some underlying buffer was flowed the event appears in the file. So the question is: does output stream guarantee immediate flush?</p> <p>To be honest I've already solve this by implementing my own <code>ImmediateRollingFileAppender</code> that leverages facility of <code>FileDescriptor</code> of immediate syncing. Anybody interested in can follow <a href="https://stackoverflow.com/a/4072895/538514">this</a>.</p> <p>So this is not a logback issue.</p>
 

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