我正在使用Websphere 8.5作为我的Web服务器，它是一个集群环境，并且正在使用会话访问大量用户，当用户访问量增加时，我们收到以下关于会话对象的错误
Thread "WebContainer : 10" (00000092) has been active for 779518 milliseconds and may be hung. There is/are 8 thread(s) in total in the server that may be hung.
at com.ibm.ws.session.store.memory.MemorySession.updateLastAccessTime(MemorySession.java:638)
at com.ibm.ws.session.store.memory.MemoryStore.getSession(MemoryStore.java:194)
at com.ibm.ws.session.store.memory.MemoryStore.getSession(MemoryStore.java:712)
at com.ibm.ws.session.SessionManager.getSessionFromStore(SessionManager.java:497)
at com.ibm.ws.session.SessionManager.getSession(SessionManager.java:476)
at com.ibm.ws.session.SessionManager.getSession(SessionManager.java:462)
at com.ibm.ws.session.SessionManager.getSession(SessionManager.java:693)
at com.ibm.ws.session.SessionContext.getIHttpSession(SessionContext.java:473)
at com.ibm.ws.session.SessionContext.sessionPreInvoke(SessionContext.java:630)
at com.ibm.ws.webcontainer.srt.SRTRequestContext.sessionPreInvoke(SRTRequestContext.java:64)
at com.ibm.ws.webcontainer.webapp.WebAppDispatcherContext.sessionPreInvoke(WebAppDispatcherContext.java:281)
at com.ibm.wsspi.webcontainer.collaborator.CollaboratorHelper.preInvokeCollaborators(CollaboratorHelper.java:473)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1086)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:914)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1662)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:463)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:530)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:316)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:287)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture$1.run(AsyncChannelFuture.java:205)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1865)
这导致我的Web服务器挂起，无法处理进一步的请求。作为间歇性解决方案，我要重启节点，这不是一个好习惯，因为有大量用户正在访问系统，希望得到响应。