默认配置的时候，异常堆栈和我们 JFR 中看到的一样，举个例子：
"Thread-0" #27 [13136] prio=5 os_prio=0 cpu=0.00ms elapsed=141.08s tid=0x0000022d6f2fbcc0 nid=0x3350 waiting for monitor entry [0x000000399bcfe000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor.enqueue(AsyncLoggerConfigDisruptor.java:375) - waiting to lock <merged>(a java.lang.Object) at org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor.enqueueEvent(AsyncLoggerConfigDisruptor.java:330) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.logInBackgroundThread(AsyncLoggerConfig.java:159) at org.apache.logging.log4j.core.async.EventRoute$1.logMessage(EventRoute.java:46) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.handleQueueFull(AsyncLoggerConfig.java:149) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.logToAsyncDelegate(AsyncLoggerConfig.java:136) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.log(AsyncLoggerConfig.java:116) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:460) at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:82) at org.apache.logging.log4j.core.Logger.log(Logger.java:162) at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2190) at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2144) at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2127) at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2003) at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1975) at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1312) 省略业务方法堆栈配置为 false 的时候，堆栈是这个样子的：
"Thread-0" #27 [18152] prio=5 os_prio=0 cpu=0.00ms elapsed=5.68s tid=0x000002c1fa120e00 nid=0x46e8 runnable [0x000000eda8efe000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@17-loom/Native Method) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@17-loom/LockSupport.java:410) at com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:136) at com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:105) at com.lmax.disruptor.RingBuffer.publishEvent(RingBuffer.java:524) at org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor.enqueue(AsyncLoggerConfigDisruptor.java:379) at org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor.enqueueEvent(AsyncLoggerConfigDisruptor.java:330) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.logInBackgroundThread(AsyncLoggerConfig.java:159) at org.apache.logging.log4j.core.async.EventRoute$1.logMessage(EventRoute.java:46) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.handleQueueFull(AsyncLoggerConfig.java:149) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.logToAsyncDelegate(AsyncLoggerConfig.java:136) at org.apache.logging.log4j.core.async.AsyncLoggerConfig.log(AsyncLoggerConfig.java:116) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:460) at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:82) at org.apache.logging.log4j.core.Logger.log(Logger.java:162) at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2190) at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2144) at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2127) at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2003) at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1975) at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1312) 5. 为何会满，我们的消费线程当时在干啥？我们来看下当时的消费线程是否有异常，由于当时硬盘 io 看系统监控并没有异常，所以这个线程很大可能是 Runnable 的，不断的在写入日志。同时，我们知道，写入文件 java 底层基于 native 调用，所以我们查看 JFR 的 native 方法采集。使用事件查看器中的 Method Profiling Sample Native，右键点击，并选择“使用所选类型事件创建新页”：