java - Servlet 2.3规范中关于Websphere session 管理策略和 session 相关内容的一些疑问

Question

在文档 Websphere Application Server Information Center - Clustered session support 中，它说

The session management facility requires an affinity mechanism so that all requests for a particular session are directed to the same application server instance in the cluster. This requirement conforms to the Servlet 2.3 specification in that multiple requests for a session cannot coexist in multiple application servers.

是不是说Websphere只能支持粘性 session (session affinity)机制？如果没有，如何在 Websphere 上配置以支持非粘性 session 策略？

在 Servlet 2.3 specification, SRV.7.7.2 Distributed Environments 中

Within an application marked as distributable, all requests that are part of a session must handled by one virtual machine at a time.

根据这个规范，它假设我们应该遵循这个规则，但是我们可以在Apache + Tomcat集群上使用非粘性 session 策略，这不是违反规则吗？

欢迎任何回复。

Answer 1

关于您的第二个问题:如果您在 Apache 服务器后面使用 Tomcat，则您使用的组件(Apache 服务器)不符合 JEE，因此它不必遵循任何 JEE 规则。

关于您的第一个问题，对于 Websphere，您可以在使用代理服务器、HTTP 插件和实现您自己的代理解决方案之间进行选择:

http://pic.dhe.ibm.com/infocenter/clmhelp/v4r0m3/index.jsp?re=1&topic=/com.ibm.jazz.install.doc/topics/t_config_reverse_proxy_ihs.html&scope=null

http://www.ibm.com/developerworks/websphere/techjournal/1010_pape/1010_pape.html

您可以通过 plugin-cfg.xml 文件中的 CloneiD 属性忽略 session 关联

http://pic.dhe.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.nd.multiplatform.doc/info/ae/ae/rwsv_plugincfg.html

CloneID (zero or one attribute for each Server) If this unique ID is present in the HTTP cookie header of a request (or the URL if using URL rewriting), the plug-in routes the request to this particular server, provided all other routing rules are met. If a CloneID is not specified in the Server, then session affinity is not enabled for this server.