Logback - 重入锁定？

Question

我们使用logback作为我们的日志记录。有这个Reentrant锁导致性能问题。知道为什么会这样吗？

这是一个调用跟踪，我们看到锁定高达9.5秒。请附上完整的跟踪。

FrameworkServlet.service:unknown (160ms self time, 36258 ms total time)
HttpServlet.service:621 (0ms self time, 36098 ms total time)
  DispatcherServlet.doService:838 (0ms self time, 31639 ms total time)
   DispatcherServlet.doDispatch:910 (0ms self time, 30835 ms total time)
    Logger.log:788 (0ms self time, 9485 ms total time)
     Logger.filterAndLog_0_Or3Plus:396 (0ms self time, 9485 ms total time)
      Logger.buildLoggingEventAndAppend:442 (0ms self time, 9485 ms total time)
       Logger.callAppenders:260 (0ms self time, 9485 ms total time)
        Logger.appendLoopOnAppenders:273 (0ms self time, 9485 ms total time)
         AppenderAttachableImpl.appendLoopOnAppenders:48 (0ms self time, 9485 ms total time)
          UnsynchronizedAppenderBase.doAppend:88 (0ms self time, 9485 ms total time)
           OutputStreamAppender.append:103 (0ms self time, 9485 ms total time)
            OutputStreamAppender.subAppend:217 (0ms self time, 9485 ms total time)
             ReentrantLock.lock:290 (9485ms self time, 9485 ms total time)

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