<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi,</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">The AsyncAppender is not very complex. You can inspect the code to see how it works. As you can see that code will get very congested with 200 threads contending for one lock. </div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">I would suggest using less threads. Using s non blocking web server. Or using log4j 2.0 with it's disruptor based async logging. <br><br>David</div><div><br>On 6 May 2016, at 19:59, Marcus Chen <<a href="mailto:marcus.chen@dev9.com">marcus.chen@dev9.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div style="font-size: 14px;">Hi,</div>
<div style="font-size: 14px;">We have a SpringBoot app that uses Logback. It uses Async appender and configured as this:</div>
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<pre style="background-color: rgb(255, 255, 255); font-family: Menlo;"><span style="font-size: 12px;"><span style="background-color: rgb(239, 239, 239);"><</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">appender </span><span style="color: rgb(0, 0, 255); background-color: rgb(239, 239, 239); font-weight: bold;">name</span><span style="color: rgb(0, 128, 0); background-color: rgb(239, 239, 239); font-weight: bold;">="ASYNC" </span><span style="color: rgb(0, 0, 255); background-color: rgb(239, 239, 239); font-weight: bold;">class</span><span style="color: rgb(0, 128, 0); background-color: rgb(239, 239, 239); font-weight: bold;">="ch.qos.logback.classic.AsyncAppender"</span><span style="background-color: rgb(239, 239, 239);">></span><br> <span style="background-color: rgb(239, 239, 239);"><</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">queueSize</span><span style="background-color: rgb(239, 239, 239);">></span>10000<span style="background-color: rgb(239, 239, 239);"></</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">queueSize</span><span style="background-color: rgb(239, 239, 239);">></span><br> <span style="background-color: rgb(239, 239, 239);"><</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">discardingThreshold</span><span style="background-color: rgb(239, 239, 239);">></span>0<span style="background-color: rgb(239, 239, 239);"></</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">discardingThreshold</span><span style="background-color: rgb(239, 239, 239);">></span><br> <span style="background-color: rgb(239, 239, 239);"><</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">appender-ref </span><span style="color: rgb(0, 0, 255); background-color: rgb(239, 239, 239); font-weight: bold;">ref</span><span style="color: rgb(0, 128, 0); background-color: rgb(239, 239, 239); font-weight: bold;">="FILE" </span><span style="background-color: rgb(239, 239, 239);">/></span><br><span style="background-color: rgb(239, 239, 239);"></</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">appender</span><span style="background-color: rgb(239, 239, 239);">></span><br><br><span style="background-color: rgb(239, 239, 239);"><</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">root </span><span style="color: rgb(0, 0, 255); background-color: rgb(239, 239, 239); font-weight: bold;">level</span><span style="color: rgb(0, 128, 0); background-color: rgb(239, 239, 239); font-weight: bold;">="INFO"</span><span style="background-color: rgb(239, 239, 239);">></span><br> <span style="background-color: rgb(239, 239, 239);"><</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">appender-ref </span><span style="color: rgb(0, 0, 255); background-color: rgb(239, 239, 239); font-weight: bold;">ref</span><span style="color: rgb(0, 128, 0); background-color: rgb(239, 239, 239); font-weight: bold;">="ASYNC" </span><span style="background-color: rgb(239, 239, 239);">/></span><br><span style="background-color: rgb(239, 239, 239);"></</span><span style="color: rgb(0, 0, 128); background-color: rgb(239, 239, 239); font-weight: bold;">root</span><span style="background-color: rgb(239, 239, 239);">></span></span><span style="font-size: 12pt;"><br></span></pre>
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<div style="font-size: 15px; margin: 0px;">The app (single instance) is configured to have up to 200 Jetty threads. Throughput is around 50 POSTs/sec. I find there are 2-4 minute gaps in messages logged after 30 minutes. The gaps appear every 20 to 30 minutes.
Am I missing additional configurations? Also is Async appender the best way to go if logging fidelity is of high importance? If not what is the best configuration so not to lose any messages. Thanks in advance.</div>
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<div style="background-color: rgb(255, 255, 255); margin: 0px;"><b><font face="Calibri" color="#0433ff"><span style="font-size: 15px;">MARCUS CHEN</span></font> – Senior Developer, AWS Certified Developer Associate</b></div>
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