答案是:子系统会同步登出。
可以跟踪源码(这里cas版本是4.x)
调用流程如下: terminateSessionAction.terminate(flowRequestContext) centralAuthenticationService.destroyTicketGrantingTicket(tgtId) 实现类CentralAuthenticationServiceImpl.destroyTicketGrantingTicket(tgtId) logoutManager.performLogout(ticket); 实现类LogoutManagerImpl.performLogout(ticket); handleLogoutForSloService((SingleLogoutService) service, entry.getKey()); performBackChannelLogout(logoutRequest) httpClient.sendMessageToEndPoint(msg);
最后调用了httpClient通知子系统,子系统终结本地session。