imaffe commented on issue #2091:
URL: https://github.com/apache/rocketmq/issues/2091#issuecomment-647877363
@heshengjun811 I think you can try add this to your logback.xml
```
<appender name="mqAsyncAppender1"
class="ch.qos.logback.classic.AsyncAppender">
<queueSize>1024</queueSize>
<discardingThreshold>80</discardingThreshold>
<maxFlushTime>2000</maxFlushTime>
<neverBlock>true</neverBlock>
<appender-ref ref="mqAppender1"/>
</appender>
``` according to [logback
example](https://rocketmq.apache.org/docs/logappender-example/)
The whole logback.xml looks like
```
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="mqAppender1"
class="org.apache.rocketmq.logappender.logback.RocketmqLogbackAppender">
<tag>TagA</tag>
<topic>01_test</topic>
<producerGroup>group1</producerGroup>
<nameServerAddress>127.0.0.1:9876</nameServerAddress>
<layout>
<pattern>%date %p %t - %m%n</pattern>
</layout>
</appender>
<appender name="mqAsyncAppender1"
class="ch.qos.logback.classic.AsyncAppender">
<queueSize>1024</queueSize>
<discardingThreshold>80</discardingThreshold>
<maxFlushTime>2000</maxFlushTime>
<neverBlock>true</neverBlock>
<appender-ref ref="mqAppender1"/>
</appender>
<root>
<level value="debug"/>
<appender-ref ref="mqAppender1"/>
</root>
<logger name="testLogger" level="debug" additivity="true">
<appender-ref ref="mqAppender1"/>
</logger>
</configuration>
```
Once I added this, it will work properly.
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