关于log4j2的异步日志输出方式

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">
  <Appenders>
    <!--正常的Appender配置，此处配置的RollingFile会在下面AsyncAppender被通过name引用-->
    <RollingFile name="RollingFileError" fileName="${Log_Home}/error.${date:yyyy-MM-dd}.log" immediateFlush="true"
filePattern="${Log_Home}/$${date:yyyy-MM}/error-%d{MM-dd-yyyy}-%i.log.gz">
     <PatternLayout pattern="%d{yyyy-MM-dd 'at' HH:mm:ss z} %-5level %logger{36} : %msg%xEx%n"/>
     <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
     <Policies>
                <TimeBasedTriggeringPolicy modulate="true" interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
     </Policies>
   </RollingFile>
    <!--一个Appender配置完毕-->
    <!--异步AsyncAppender进行配置直接引用上面的RollingFile的name-->
    <Async name="Async">
      <AppenderRef ref="MyFile"/>
    </Async>
    <!--异步AsyncAppender配置完毕，需要几个配置几个-->
  </Appenders>
  <Loggers>
    <Root level="error">
      <!--此处如果引用异步AsyncAppender的name就是异步输出日志-->
      <!--此处如果引用Appenders标签中RollingFile的name就是同步输出日志-->
      <AppenderRef ref="Async"/>
    </Root>
  </Loggers>
</Configuration>

<dependency>
  <groupId>com.lmax</groupId>
  <artifactId>disruptor</artifactId>
  <version>3.4.2</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="debug" name="MyApp" packages="">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
        </Console>
        <RollingFile name="RollingFile" fileName="logs/app.log"
                     filePattern="logs/app-%d{yyyy-MM-dd HH}.log">
            <PatternLayout>
                <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
            </PatternLayout>
            <Policies>
                <SizeBasedTriggeringPolicy size="500MB"/>
            </Policies>
        </RollingFile>
        <RollingFile name="RollingFile2" fileName="logs/app2.log"
                     filePattern="logs/app2-%d{yyyy-MM-dd HH}.log">
            <PatternLayout>
                <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
            </PatternLayout>
            <Policies>
                <SizeBasedTriggeringPolicy size="500MB"/>
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
    <!--上面的配置都和原配置一样，就是在下方这直接定义AsyncLogger，他的name在java类中被引用即可-->
        <AsyncLogger name="com.meituan.Main" level="trace" additivity="false">
            <appender-ref ref="RollingFile"/>
        </AsyncLogger>
        <AsyncLogger name="RollingFile2" level="trace" additivity="false">
            <appender-ref ref="RollingFile2"/>
        </AsyncLogger>
        <Root level="debug">
            <AppenderRef ref="Console"/>
            <AppenderRef ref="RollingFile"/>
        </Root>
    </Loggers>
</Configuration>

public class Main {
    public static void main(String args[]) {
        //引用com.meituan.Main日志输出器
        Logger logger = LogManager.getLogger(Main.class);
        //引用的名为RollingFile2的异步AsyncLogger
        Logger logger2 = LogManager.getLogger("RollingFile2");
        Person person = new Person("Li", "lei");
        logger.info("hello, {}", person);
        logger2.info("Good bye, {}", person);
}

<Async name="asynckafkaLog">
    <AppenderRef ref="Failover" />
</Async>

<AsyncLogger name="kafkaLogger" level="trace" includeLocation="false">
    <AppenderRef ref="Failover"/>
</AsyncLogger>

#启动参数方式
-DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector
#代码方式
System.setProperty("Log4jContextSelector", "org.apache.logging.log4j.core.async.AsyncLoggerContextSelector");

#第一步：加大两个Disruptor队列的长度
-DAsyncLogger.RingBufferSize=262144
-DAsyncLoggerConfig.RingBufferSize=262144  
#第二步：设置队列满了时的处理策略：丢弃，否则默认blocking，异步就与同步无异了
-Dlog4j2.AsyncQueueFullPolicy=Discard