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Victor.Chu's Blog

 2 years ago
source link: https://blog.victorchu.info/posts/496918eb/
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neoserver,ios ssh client

logback 性能优化

日志是服务中一个重要组成部分，当优化性能的时候，也要思考对日志的性能优化。

控制台日志

生产环境应该关闭控制台日志。可以减少不必要的开销。

logback 和 log4j 等日志框架获取行号的方式是相同的。即通过 throw 时获取 StackTrace，然后从中解析出 文件名和行号。

public StackTraceElement[] getCallerData() {
    if (callerDataArray == null) {
        callerDataArray = CallerData
            .extract(new Throwable(), fqnOfLoggerClass, loggerContext.getMaxCallerDataDepth(), loggerContext.getFrameworkPackages());
    }
    return callerDataArray;
}

在生产环境中可以不打印 文件名和行号来减少日志的性能消耗。

如果开启了异步 Appender, 还要注意一个参数 includeCallerData

protected void preprocess(ILoggingEvent eventObject) {
    eventObject.prepareForDeferredProcessing();
    if (includeCallerData)
        eventObject.getCallerData();
}
<appender name="access-async" class="ch.qos.logback.classic.AsyncAppender">
      <appender-ref ref="access"/>
      <includeCallerData>false</includeCallerData>
  </appender>

过滤异常栈

异常栈可以非常有效地帮助定位问题，但是也会因为异常栈太长，包含了太多几乎无价值的信息，比如反射、动态代理、Spring、tomcat 等调用信息。过滤掉这部分信息，既减少了日志量，也减少大对象的数量，降低 Full GC 的次数。常用配置如下：

<property name="commonPattern" value="[%thread][%level][%class{0}:%line]: %msg%n%rEx{full,
     java.lang.reflect.Method,
     sun.reflect,
     org.apache.catalina,
     org.springframework.aop,
     org.springframework.security,
     org.springframework.transaction,
     org.springframework.web,
     org.springframework.beans,
     org.springframework.cglib,
     net.sf.cglib,
     org.apache.tomcat.util,
     org.apache.coyote,
     ByCGLIB,
     BySpringCGLIB,
     com.google.common.cache.LocalCache$
}"/>

report

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