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公司需要将应用日志上报到kafka，以供分析与查看。

结合logback可以完成此功能，大致配置如下：

<appender name="KafkaAppender" class="com.github.danielwegener.logback.kafka.KafkaAppender"><encoder class="com.github.danielwegener.logback.kafka.encoding.LayoutKafkaMessageEncoder"><layout class="net.logstash.logback.layout.LogstashLayout" ><includeContext>true</includeContext><includeCallerData>true</includeCallerData><fieldNames class="net.logstash.logback.fieldnames.ShortenedFieldNames"/></layout><charset>UTF-8</charset></encoder><!--kafka topic 需要与配置文件里面的topic一致 否则kafka会沉默并鄙视你--><topic>${topic}</topic><keyingStrategy class="com.github.danielwegener.logback.kafka.keying.HostNameKeyingStrategy" /><deliveryStrategy class="com.github.danielwegener.logback.kafka.delivery.AsynchronousDeliveryStrategy" /><producerConfig>bootstrap.servers=${BOOT_SERVER}</producerConfig></appender>

上述配置有个问题：
当kafka服务异常时，会阻塞业务系统请求。

此时，引入AsyncAppender可以处理上面的问题，让日志系统异步执行，当kafka出现问题时，不阻塞业务系统，大致配置如下：

<appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender"><appender-ref ref="KafkaAppender"/><queueSize>1000</queueSize><discardingThreshold>0</discardingThreshold><!--这里一定要配置--><neverBlock>true</neverBlock></appender>

实际使用时，本地启动，一切正常，当将jar放到服务器上时，日志系统无法启动，最终导致服务启动失败，部分堆栈如下：

Caused by: java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in com.github.danielwegener.logback.kafka.KafkaAppender[KafkaAppender] - Appender [KafkaAppender] failed to append. org.apache.kafka.common.errors.InterruptException: java.lang.InterruptedException
ERROR in com.github.danielwegener.logback.kafka.KafkaAppender[KafkaAppender] - Appender [KafkaAppender] failed to append. org.apache.kafka.common.errors.InterruptException: java.lang.InterruptedException
ERROR in com.github.danielwegener.logback.kafka.KafkaAppender[KafkaAppender] - Appender [KafkaAppender] failed to append. org.apache.kafka.common.errors.InterruptException: java.lang.InterruptedExceptionat org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:169)at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithConventions(AbstractLoggingSystem.java:80)at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:60)at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:118)at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:313)at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:288)at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246)at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223)at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76)at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345)at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)at cn.com.bdo.gateway.BizBdoGatewayApplication.main(BizBdoGatewayApplication.java:16)

经过不断尝试，日志系统添加以下配置即可处理上述问题：

<logger name="org.springframework.boot.context.logging" level="DEBUG"/>

由于只有服务器上有问题，debug比较困难，所以没有继续分析原因。

特此记录。