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技术文章 - CS321821

如果关联队列在 ThingWorx Platform 上已满，则更新 Remote Things 的 lastConnectionTime 属性可能会造成死锁情况

已修改: 22-Nov-2022   


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适用于

  • ThingWorx Platform 8.1 to 8.5

说明

  • 当许多远程事物同时连接时，ThingWorx 平台会变得不稳定
  • lastConnectionTime属性更新似乎与 ThingWorx 性能有关
  • ThingWorx Platform 性能不佳
  • ThingWorx Platform 已停止工作并且无法再访问 Composer
  • 线程转储显示大量线程在 java.util.concurrent.locks.ReentrantLock$NonfairSync 上等待：
    • 阻塞线程
      "https-jsse-nio-8443-exec-85" tid=0x7746d in WAITINGBlocked: 2696[-1ms], Waited: 879194[-1ms]
User CPU: 35m26s
    - synchronizer <0x143fa594> (a java.util.concurrent.ThreadPoolExecutor$Worker)
    at sun.misc.Unsafe.park(Native Method)
    - waiting on <0x37c62d09> (a java.util.concurrent.locks.ReentrantLock$NonfairSync), held by https-jsse-nio-8443-exec-84
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
    at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
    at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
    at com.thingworx.communications.platform.modules.DispatchingServerCommunicationModule.processBindMessage(DispatchingServerCommunicationModule.java:471)
    at com.thingworx.communications.platform.modules.DispatchingServerCommunicationModule.processCompletedBindMessage(DispatchingServerCommunicationModule.java:348)
    at com.thingworx.communications.platform.modules.DispatchingServerCommunicationModule.processBindRequestMessage(DispatchingServerCommunicationModule.java:267)
    at com.thingworx.communications.platform.modules.DispatchingServerCommunicationModule.process(DispatchingServerCommunicationModule.java:146)
    at com.thingworx.communications.server.endpoints.DispatchingServerEndpoint.messageReceived(DispatchingServerEndpoint.java:116)
    at com.thingworx.communications.server.connection.jsr356.Jsr356ServerConnection.onMessage(Jsr356ServerConnection.java:338)
    at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43
      • 锁定线程：
        "https-jsse-nio-8443-exec-84" tid=0x77467 in WAITINGBlocked: 2755[-1ms], Waited: 881187[-1ms]
User CPU: 38m20s
    - synchronizer <0x37c62d09> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
    - synchronizer <0x3f476c55> (a java.util.concurrent.ThreadPoolExecutor$Worker)
    at sun.misc.Unsafe.park(Native Method)
    - waiting on <0x6f66f64> (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.LinkedBlockingDeque.putLast(LinkedBlockingDeque.java:396)
    at java.util.concurrent.LinkedBlockingDeque.put(LinkedBlockingDeque.java:649)
    at com.thingworx.persistence.provider.StreamEntryProcessor.queueEntry(StreamEntryProcessor.java:142)
    at com.thingworx.system.managers.ThingManager$PersistentPropertyCache.put(ThingManager.java:796)
    at com.thingworx.things.Thing.rawSetPropertyVTQ(Thing.java:4103)
    at com.thingworx.things.Thing.rawSetPropertyVTQ(Thing.java:4063)
    at com.thingworx.things.connected.RemoteThing.updateLastConnection(RemoteThing.java:322)
    at com.thingworx.things.connected.RemoteThing.setConnected(RemoteThing.java:291)
    at com.thingworx.things.connected.RemoteThing.setCommunicationEndpoint(RemoteThing.java:359)
    at com.thingworx.things.connected.RemoteThing.bindEndpoint(RemoteThing.java:419)
	...
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