请求在高峰时间在Tomcat 8中花费太多时间

时间：2017-10-08 16:53:45

标签： java spring hibernate tomcat spring-boot

我已使用以下配置配置tomcat：

<Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           maxThreads="500"
           maxConnections="20000"
           acceptCount="150"
           etc... />

AJP个连接符，maxThreads=500和acceptCount="150"的相同数字。

大部分时间都可以正常工作，但在高峰时段，当我的请求比平时多得多时，响应时间太长。有时超过15秒，极少数情况下是timeOut。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：

  

最大线程数：500当前线程数：17当前线程忙：1保持   活插座数：1

到目前为止我看到的currentThreadCount的最大数量是27.如果有这么多的连接，tomcat是否应该创建更多的线程（最多500个）来更快地响应？

那么，我做错了什么？我错过了什么？我有 2核心CPU （高峰时段最大使用量~10％）和 2GB内存（最大使用率60％）。

关于网络应用的简短信息：通常，每个用户每个会话至少发出2个请求：静态JSON响应和1个数据库查询。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。但是，慢响应从5k活跃用户开始。

我还增加了app属性上的最大活动连接数，但性能没有变化，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JDBC连接池更改为Hikari并启用了jta，但是，在高峰时间没有任何差异：

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。稍后将查询结果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几乎是一半免费，如果我有太多请求，我不应该在服务器上超载？相反，我的响应时间很慢。因此，我认为我有一个配置问题，我想解决。

  

-Xms512M -Xmx1024M

JVM

高峰期挂起的应用：

  

活动会话：3243会话数：475330最大活动会话数：4685拒绝会话创建数：0过期会话数：472105最长会话活动时间：7457秒平均会话活动时间：9秒处理时间：3177毫秒   加载的JSP：重新加载0个JSP：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的回答让我朝着正确的方向分别分析每个线程并找到问题。我现在必须奖励我的赏金，因此，我将奖励给他。但是，我感谢在此发表评论的所有人，因为所有评论都帮助我学习了一些新东西。

更新2： 看起来这个问题在apache中。在高峰时段，甚至静态页面的响应时间也很慢，甚至是其他应用程序的响应时间。包括 tomcat manager 。因此，我将prefork更改为mpm_worker，目前正在测试不同的配置。我很快就会用结果更新这个帖子。

6 个答案:

答案 0 :(得分：3)

我担心这个问题目前没有足够的信息用于猜测以外的任何事情。 CPU使用率低表示您的java进程正在等待某些事情，这可能是从获取与数据库的连接，等待查询结果或其他任何事情。在尝试修复之前，我会首先查看导致等待的。一种方法是运行

jstack <pid>

（其中<pid>是您在峰值期间的过程＆＃p; pid）。它将列出每个线程的堆栈跟踪。您可以从中发现问题，或者您可以将其粘贴到问题中，也许社区可以帮助您解决问题。祝你好好调整！

答案 1 :(得分：2)

您可以根据需要允许任意数量的线程，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。

你需要确定他的瓶颈在哪里。创建一个虚拟页面并向其发出请求，就像来自多台计算机的疯子一样。如果虚拟页面及时响应，那么您的问题与连接数量和数据库的更多相关性是松散的。这种情况极有可能发生。

查看您的数据库，确保您的架构处于正常状态。此外，如果您经常搜索某些列，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。缓存一些不会过于频繁更改的数据并重复使用。

答案 2 :(得分：1)

使用spring时，默认为Tomcat。您如何使用Netty或Undertow或Jetty获得更好的性能。还要记住，尽管拥有2核CPU，但你并没有500线程。

上述实际模拟应用程序如何响应流量的答案可能是最好的方法。如果使用关系数据库，请记住写入甚至比读取慢十倍（您可以在Cassandra文档中看到一些有趣的统计信息）。如果使用休眠，你可能也想查找n + 1问题。最好的方法是：编写集成测试，将log sql发送到数据库。如果您的测试发送51而不是一个查询，那么您就拥有它。

答案 3 :(得分：1)

  

如果有这么多连接，不应该tomcat创建更多线程   （最多500个）响应更快？

=＆GT;根据Tomcat8文档，如果收到的并发请求多于当前可用的请求处理线程可处理的请求，则将创建其他线程，直到达到配置的最大值（maxThreads属性的值）。如果收到更多并发请求，它们将堆叠在连接器创建的服务器套接字内，最多为配置的最大值（acceptCount属性的值）。

所以你的tomcat必须根据需要创建线程。此外，Tomcat 8默认在NIO模式下工作，这意味着一个线程可以提供多个请求。您可以通过在负载测试期间启动监视工具（如“jvisualvm”）来确认该行为。

enter image description here 实时线程：这显示当前活动/活动线程数，包括守护程序和非守护程序线程（当前正在运行）。

Live Peak ：这表示自Java虚拟机启动或峰值重置以来活动线程的峰值计数。

守护程序线程：这提供了当前活动守护程序线程的数量。

总线程数：这表示自Java虚拟机启动以来创建和启动的线程总数。

  

那么，我做错了什么？我错过了什么？我有2个核心CPU（最大   在高峰时段使用~10％）和2GB RAM（最大使用率60％）.CPU使用率   没有增长，如果我有太多，RAM几乎是半免费的   请求，我不应该在服务器上超载？相反，我得到了   响应时间慢。

=＆gt; IMO，线程在从DB获取数据时阻塞。这可能是由于加载时间内查询性能不佳。我建议启用“hibernate.show_sql”捕获SQL。检查SQL的执行计划，确保正在应用索引。您还可以通过在SQL客户端上执行查询来加载查询期间的性能。

答案 4 :(得分：1)

在这些错误中，首先我们应该确定问题所在。这里给出了调试这些类型问题的行动计划：

例如在您的情况下

请求来自用户到tomcat，然后它会将它提供给您的应用程序。

首先，检查问题所在，即以下地方可能存在问题：

  1. 您的任何应用程序api或所有api都开始花时间，但tomcat线程是免费的
  2. 您的tomcat线程不是免费的，处理这些每个线程都需要时间，因此会发生延迟
  3. 您的数据库开始耗费时间
  4. 当您查询数据库时，可能会出现更多数据被加载到您的应用中并且发生了一些java gc问题

    5. 所以，在第一种情况下，请检查您的应用程序日志，如果日志不存在，请将日志和检查，如果您的任何应用程序花费时间（日志从未说谎）

    在第二种情况中，检查tomcat日志中的条件是什么。

    在第三种情况中，请检查您的数据库日志，查询是否需要更多时间。

    在第四种情况中，您可以监控您的java健康监控，市场上有很多工具，如jfr，jcisualvm等。

    另外，您的问题解释不够，请回答以下内容

    1. 您的申请的样本结构是什么？
    2. 你做了什么来恢复你的应用程序而不是正常状态，例如，重新启动是否解决了你的问题？ 我问这个是因为如果你需要重新启动它，那么可能会出现死锁，所以你可能需要采取jstack并对其进行分析
    3. 应用程序提供了多少XMX？
    4. 您的数据库服务器和应用程序服务器是否在同一台计算机上？ 因为某些机器在高峰时间可能存在一些问题，所以我们需要检查两者

      5. 请首先确定问题所在，然后我们可以继续进行，我们如何识别和解决问题。

      由于

答案 5 :(得分：1)

我终于解决了我的问题。事实上，它是apache，没有足够的连接。首先，我将Oct 23, 2017 3:12:45 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions INFO: Loading XML bean definitions from class path resource [applicationContext.xml] Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'd' defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean 'template' while setting bean property 'template'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'template' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/JDBCException at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1469) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at springhibernate.InsertTest.main(InsertTest.java:15) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'template' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/JDBCException at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1093) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1038) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351) ... 10 more Caused by: java.lang.NoClassDefFoundError: org/hibernate/JDBCException at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) at java.lang.Class.getConstructor0(Unknown Source) at java.lang.Class.getDeclaredConstructor(Unknown Source) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:80) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1086) ... 18 more Caused by: java.lang.ClassNotFoundException: org.hibernate.JDBCException at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 24 more** 更改为prefork。后来，我增加了mpm worker的数量。

MaxRequestWorkers

早些时候，我的响应时间已经很慢，有3000名活跃用户。使用新配置，即使是17000个活跃用户也没有增加响应时间，并且它在正常时间工作。正如预期的那样，CPU使用率和RAM在高峰时间增加，然后恢复正常。

相关问题
最新问题