Auto FE Updater: Updates front-end applications in a multi-user environment.
AutoFEUpdater：在多用户环境中升级前端应用。
The front-end(FE) in the cluster distributes the requests to back-ends(BE) according to the layer-4 load balancing policy.
集群前端使用基于第4层的负载平衡策略将用户请求分发给后端；
The front-end(FE) in the cluster distributes the requests to back-ends(BE) according to the layer-4 load balancing policy.
集群前端使用基于第4层的负载平衡策略将用户请求分发给后端；
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