开启log4j2异步日志

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看到这样的性能提升，可能每个程序员都会对她着迷片刻。

官方文档
http://logging.apache.org/log4j/2.x/manual/async.html

1、使用方式一：全局开启

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Making All Loggers Asynchronous

需要disruptor-3.0.0.jar

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This is simplest to configure and gives the best performance. To make all loggers asynchronous, add the disruptor jar to the classpath and set the system property Log4jContextSelector to org.apache.logging.log4j.core.async.AsyncLoggerContextSelector.

开启全局异步日志的最简单的方法是设置Log4jContextSelector系统属性为
org.apache.logging.log4j.core.async.AsyncLoggerContextSelector

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By default, location is not passed to the I/O thread by asynchronous loggers. If one of your layouts or custom filters needs location information, you need to set "includeLocation=true" in the configuration of all relevant loggers, including the root logger.

默认location是不会被发送到异步日志。如果需要location信息，需要设置includeLocation=true

2、使用方式二：混合同步异步日志

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Requires disruptor-3.0.0.jar or higher on the classpath. There is no need to set system property "Log4jContextSelector" to any value.

需要 disruptor-3.0.0.jar，但不需要在系统属性中配置Log4jContextSelector值。

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