我已经使用以下配置配置了 tomcat:
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
maxThreads="500"
maxConnections="20000"
acceptCount="150"
etc... />
AJP 连接器的相同数字，maxThreads=500 和 acceptCount="150"。
它大部分时间都运行良好，但在高峰时段，当我收到比平时多得多的请求时，响应时间太长。有时会超过 15 秒，在极少数情况下会超时。它可能看起来没问题，因为 maxThreads=500 并且我有几千个请求，但是，在服务器状态上我看到:
Max threads: 500 Current thread count: 17 Current thread busy: 1 Keep alive sockets count: 1
目前我看到的currentThreadCount的最大数量是27。如果有这么多连接，tomcat不应该创建更多的线程(最多500个)以更快地响应吗？
那么，我做错了什么？我错过了什么？我有 2 核 CPU(高峰时段的最大使用率 ~10%)和 2GB RAM(最大使用率 60%)。
关于网络应用的简短信息:通常，每个用户每次 session 至少发出 2 次请求:静态 JSON 响应和 1 次数据库查询。在高峰时间，我有 15-20k 活跃用户，但我不知道每秒有多少请求。然而，缓慢的响应从 5k 活跃用户开始。
我还增加了应用程序属性的最大 Activity 连接数，性能没有变化，我当前的 application.properties:
spring.jpa.hibernate.ddl-auto=update
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/database_name
spring.datasource.username=$username$
spring.datasource.password=$password$
spring.datasource.tomcat.max-active=200
spring.datasource.tomcat.max-wait=10000
spring.datasource.tomcat.max-idle=50
spring.datasource.tomcat.min-idle=10
spring.datasource.tomcat.initial-size=10
更新
我使用以下配置将默认的 JDBC 连接池更改为 Hikari 并启用了 jta，但是，在高峰时间没有感觉到任何差异:
spring.jta.enabled=true
spring.datasource.hikari.maximum-pool-size=125
spring.datasource.hikari.minimum-idle=5
我在下面添加数据库查询。查询结果稍后添加到另一个对象中并作为 ResponseBody 返回。
@Query("select new ObjectClass(s.id, s.a, s.b, s.c") from TableName s " +
"where s.x > :param order by id desc")
List<ObjectClass> getObjects(@Param("param") long param);
CPU 使用率没有增长，RAM 几乎是一半空闲，如果我有太多请求，我不应该在服务器上重载吗？相反，我的响应时间很慢。因此，我想我有一个配置问题需要解决。
-Xms512M -Xmx1024M
高峰期挂掉的app:
Active sessions: 3243 Session count: 475330 Max active sessions: 4685 Rejected session creations: 0 Expired sessions: 472105 Longest session alive time: 7457 s Average session alive time: 9 s Processing time: 3177 ms JSPs loaded: 0 JSPs reloaded: 0
堆栈跟踪:
"Attach Listener" #502 daemon prio=9 os_prio=0 tid=0x00007fde58007800 nid=0x3ff waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Abandoned connection cleanup thread" #69 daemon prio=5 os_prio=0 tid=0x00007fde6c03e800 nid=0xa44 in Object.wait() [0x00007fde471ba000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x00000000c259e618> (a java.lang.ref.ReferenceQueue$Lock)
at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-exec-25" #68 daemon prio=5 os_prio=0 tid=0x00007fde40016000 nid=0x741 waiting on condition [0x00007fde35fe0000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-exec-11" #54 daemon prio=5 os_prio=0 tid=0x00007fde38041800 nid=0x733 waiting on condition [0x00007fde36fee000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-AsyncTimeout" #52 daemon prio=5 os_prio=0 tid=0x00007fde884e8800 nid=0x732 waiting on condition [0x00007fde370ef000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1211)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-Acceptor-0" #51 daemon prio=5 os_prio=0 tid=0x00007fde884e6800 nid=0x731 runnable [0x00007fde371f0000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
- locked <0x00000000c019d7e8> (a java.lang.Object)
at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:455)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-ClientPoller-1" #50 daemon prio=5 os_prio=0 tid=0x00007fde884e4800 nid=0x730 runnable [0x00007fde372f1000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000000c1da2fa0> (a sun.nio.ch.Util$3)
- locked <0x00000000c1da2f90> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000c1d5b1e0> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:787)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-ClientPoller-0" #49 daemon prio=5 os_prio=0 tid=0x00007fde884d6000 nid=0x72f runnable [0x00007fde373f2000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000000c1d510d8> (a sun.nio.ch.Util$3)
- locked <0x00000000c1d510c8> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000c1ce78c0> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:787)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-exec-10" #48 daemon prio=5 os_prio=0 tid=0x00007fde884c7000 nid=0x72e waiting on condition [0x00007fde374f3000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-exec-2" #40 daemon prio=5 os_prio=0 tid=0x00007fde884b7000 nid=0x726 waiting on condition [0x00007fde37cfb000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"ajp-nio-8009-exec-1" #39 daemon prio=5 os_prio=0 tid=0x00007fde884b5000 nid=0x725 waiting on condition [0x00007fde37dfc000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"http-nio-127.0.0.1-8080-AsyncTimeout" #38 daemon prio=5 os_prio=0 tid=0x00007fde884b3000 nid=0x724 waiting on condition [0x00007fde37efd000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1211)
at java.lang.Thread.run(Thread.java:748)
"http-nio-127.0.0.1-8080-Acceptor-0" #37 daemon prio=5 os_prio=0 tid=0x00007fde884b1800 nid=0x723 runnable [0x00007fde37ffe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
- locked <0x00000000c01a03b8> (a java.lang.Object)
at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:455)
at java.lang.Thread.run(Thread.java:748)
"http-nio-127.0.0.1-8080-exec-1" #25 daemon prio=5 os_prio=0 tid=0x00007fde88324000 nid=0x717 waiting on condition [0x00007fde46db8000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c1d9c4e0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
"ContainerBackgroundProcessor[StandardEngine[Catalina]]" #24 daemon prio=5 os_prio=0 tid=0x00007fde88323000 nid=0x716 waiting on condition [0x00007fde476bb000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1355)
at java.lang.Thread.run(Thread.java:748)
"Abandoned connection cleanup thread" #22 daemon prio=5 os_prio=0 tid=0x00007fde4ca72800 nid=0x6f5 in Object.wait() [0x00007fde45c22000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x00000000c102c4b0> (a java.lang.ref.ReferenceQueue$Lock)
at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
"Tomcat JDBC Pool Cleaner[1595428806:1507838479700]" #21 daemon prio=5 os_prio=0 tid=0x00007fde4ca5b800 nid=0x6f4 in Object.wait() [0x00007fde470b9000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.util.TimerThread.mainLoop(Timer.java:552)
- locked <0x00000000c0f6fe80> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:505)
"NioBlockingSelector.BlockPoller-2" #13 daemon prio=5 os_prio=0 tid=0x00007fde8847e000 nid=0x66f runnable [0x00007fde478bd000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000000c019bd40> (a sun.nio.ch.Util$3)
- locked <0x00000000c019bd30> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000c019bbf8> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:339)
"NioBlockingSelector.BlockPoller-1" #12 daemon prio=5 os_prio=0 tid=0x00007fde8846f800 nid=0x66e runnable [0x00007fde479be000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000000c019ec10> (a sun.nio.ch.Util$3)
- locked <0x00000000c019ec00> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000c019ead8> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:339)
"GC Daemon" #11 daemon prio=2 os_prio=0 tid=0x00007fde883f9000 nid=0x66b in Object.wait() [0x00007fde741c6000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c02f16d8> (a sun.misc.GC$LatencyLock)
at sun.misc.GC$Daemon.run(GC.java:117)
- locked <0x00000000c02f16d8> (a sun.misc.GC$LatencyLock)
"AsyncFileHandlerWriter-1510467688" #10 daemon prio=5 os_prio=0 tid=0x00007fde88168800 nid=0x63e waiting on condition [0x00007fde7475c000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c02f16e8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingDeque.pollFirst(LinkedBlockingDeque.java:522)
at java.util.concurrent.LinkedBlockingDeque.poll(LinkedBlockingDeque.java:684)
at org.apache.juli.AsyncFileHandler$LoggerThread.run(AsyncFileHandler.java:160)
"Service Thread" #7 daemon prio=9 os_prio=0 tid=0x00007fde880af000 nid=0x62e runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fde880ac000 nid=0x62d waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fde880a9000 nid=0x62c waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007fde880a7000 nid=0x62b runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fde88080000 nid=0x625 in Object.wait() [0x00007fde74f33000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x00000000c02f7408> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fde8807b800 nid=0x622 in Object.wait() [0x00007fde75034000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x00000000c02f7490> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
"main" #1 prio=5 os_prio=0 tid=0x00007fde8800a800 nid=0x589 runnable [0x00007fde8f6af000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)
at java.net.ServerSocket.implAccept(ServerSocket.java:545)
at java.net.ServerSocket.accept(ServerSocket.java:513)
at org.apache.catalina.core.StandardServer.await(StandardServer.java:466)
at org.apache.catalina.startup.Catalina.await(Catalina.java:744)
at org.apache.catalina.startup.Catalina.start(Catalina.java:690)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
"VM Thread" os_prio=0 tid=0x00007fde88073800 nid=0x5fd runnable
"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007fde8801f800 nid=0x597 runnable
"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007fde88021000 nid=0x598 runnable
"VM Periodic Task Thread" os_prio=0 tid=0x00007fde880bd800 nid=0x62f waiting on condition
JNI global references: 317
更新: 虽然我还没有解决我的问题，但@Per Huss 的回答将我推向了正确的方向，分别分析每个线程并找到问题所在。我现在必须奖励我的赏金，因此，我将奖励给他。不过，我感谢所有在这里发表评论的人，因为所有评论都帮助我学到了新东西。
更新 2:
看起来问题出在 apache 中。在高峰时段，即使是静态页面的响应时间也很慢，即使是来自其他应用程序的页面也是如此。包括 tomcat 管理器。因此，我将 prefork 更改为 mpm_worker 并且目前正在测试不同的配置。我将很快用结果更新此线程。
最佳答案
您可以允许任意多的线程，但如果查询数量增加，那么 RDBMS 的响应时间将会恶化，这可能是您的根本原因。
您需要确定他的瓶颈在哪里。创建一个虚拟页面并像疯子一样从多台计算机向它发出请求。如果虚拟页面及时响应，那么您的问题与连接数和更多与您的数据库的关系松散相关。很有可能是这种情况。
查看您的数据库，确保您的模式是正常形式。此外，如果您经常按某些列进行搜索，请确保创建正确的索引。查看您的查询并观察它们是否不必要地慢。如果是这样，请优化它们。缓存一些不会太频繁变化的数据并重复使用。
关于java - 在高峰时间，请求在 Tomcat 8 中花费太多时间，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46633637/