Agreed: if you
use
-DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector
then *all* loggers will be async.
If you do not use the -DLog4jContextSelector=... system property then only
loggers configured with <AsyncRoot> or <AsyncLogger> will be async and
the loggers configured as <Logger> will be synchronous.
In your example:
<Loggers>
<logger name="Class_A" level="info" additivity="false"><AppenderRef
ref="A" /></Logger>
<AsyncRoot level="info><AppenderRef ref="A" /></AsyncRoot>
</Loggers>
LogManager.getLogger("Class_A").info("some message"); // this is logged
synchronously
If additivity=true, the event will be processed both by the root logger
(asynchronously) and by the Class_A logger (synchronously).
Remko
On Mon, Oct 19, 2015 at 7:01 PM, 流子℡ <[email protected]> wrote:
> if you set -DAsyncLoggerContextSelector ,all the asyncRoot node should be
> changed to Root, because needn't.
> the difference is set DAsyncLoggerContextSelector make all the logger
> async,however. asyncRoot only make async inclued in the node.
>
>
>
>
> ------------------ 原始邮件 ------------------
> 发件人: "Strong Su";<[email protected]>;
> 发送时间: 2015年10月19日(星期一) 下午5:57
> 收件人: "Log4J Users List"<[email protected]>;
>
> 主题: Difference between <asyncRoot> and -DAsyncLoggerContextSelector
>
>
>
> Hello everyone,
>
> I'm not pretty sure about the difference <asyncRoot>
> and -DAsyncLoggerContextSelector.
> Here is a small slice example of log4j2.xml:
>
> <Loggers>
> <logger name="Class_A" level="info" additivity="false"/>
> <root level="info/>
> </Loggers>
>
> When I set -DAsyncLoggerContextSelector, and both Class_A's logs and other
> logs(like Class_B) should be async because the JAVA_OPTS makes all loggers
> async..
> But if I do not set -DAsyncLoggerContextSelector and change root to
> asyncroot.
> Should logs from Class_A be async or sync?
> And what will happen if I remove additivity="false"?
>
> Thank you.
> Best Regards,
> Dylan Su
>
