Multithreading 不一致的Tomcat响应时间

我的Tomcat（8.5.8，落后于apachehttpd）有时（<1%）有很长的等待时间（这是由于）

提供的堆栈跟踪显示Tomcat正在等待闩锁。当时我的Tomcat主机内存、CPU、磁盘IO、垃圾回收看起来不错。 我试图发出相同的请求，但返回了相同的数据（压缩大小为2.5MB，原始大小约为25MB）。大多数时间还行（<2秒），但很少时间过长（>20秒）

等待是因为什么原因？客户端之间的连接问题？慢客户端？Apache HTTPD和Tomcat之间的连接问题？没有足够的文件描述符

这里的闩锁是什么？

检查，看起来与您的问题有关。检查，看起来与您的问题有关。

JVM Thread Stats
CPU time: 422.3 milliseconds
Blocked time: 0.0 milliseconds
Waited time: 26,576.0 milliseconds
Allocated memory: 73.3 MB 

com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeString(UTF8JsonGenerator.java:432)
com.fasterxml.jackson.core.json.UTF8JsonGenerator._writeStringSegments(UTF8JsonGenerator.java:1148)
com.fasterxml.jackson.core.json.UTF8JsonGenerator._flushBuffer(UTF8JsonGenerator.java:2003)
org.springframework.security.web.context.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:540)
org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96)
org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:369)
org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:391)
org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:713)
org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:808)
org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:351)
org.apache.coyote.Response.doWrite(Response.java:517)
org.apache.coyote.ajp.AjpProcessor$SocketOutputBuffer.doWrite(AjpProcessor.java:1469)
org.apache.coyote.ajp.AjpProcessor.access$900(AjpProcessor.java:54)
org.apache.coyote.ajp.AjpProcessor.writeData(AjpProcessor.java:1353)
org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:361)
org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:419)
org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:670)
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1259)
org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:157)
org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:114)
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.awaitWriteLatch(NioEndpoint.java:1109)
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.awaitLatch(NioEndpoint.java:1106)
java.util.concurrent.CountDownLatch.await(CountDownLatch.java:277)
java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
sun.misc.Unsafe.park(Native Method)

TIMED_WAITING