本文選題：智慧協(xié)同網(wǎng)絡(luò) + 映射系統(tǒng)�。� 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：隨著網(wǎng)絡(luò)的迅猛發(fā)展,互聯(lián)網(wǎng)原始設(shè)計的弊端日益體現(xiàn)。北京交通大學(xué)下一代互聯(lián)網(wǎng)互聯(lián)設(shè)備國家工程實驗室提出了智慧協(xié)同網(wǎng)絡(luò)模型,通過“三層”、“兩域”的范圍劃分,將多種信息所攜帶的雙重含義分離開,有效地解決了現(xiàn)有網(wǎng)絡(luò)體系的問題。作為智慧協(xié)同網(wǎng)絡(luò)的核心部分,映射系統(tǒng)將用戶的身份信息與位置信息予以映射分離,并為映射關(guān)系條目提供了存儲管理以及解析查詢服務(wù)。在使用該網(wǎng)絡(luò)通信時,接入交換路由器得到通信對端的映射關(guān)系后,會把該映射關(guān)系緩存至本地,以便再次使用時無需向服務(wù)器發(fā)起重復(fù)查詢,從而減小時延。當(dāng)通信對端映射關(guān)系發(fā)生改變時,接入交換路由器無法及時與服務(wù)器端同步,之前所緩存的映射條目便會過期失效,從而產(chǎn)生一致性問題。由于當(dāng)前系統(tǒng)使用弱一致性機制,發(fā)送方會使用已過期的映射關(guān)系,該行為會使數(shù)據(jù)發(fā)往錯誤終端,導(dǎo)致通信過程受到影響。因此,映射系統(tǒng)中的一致性問題亟待解決。針對該問題,本文設(shè)計了一種適用于智慧協(xié)同網(wǎng)絡(luò)分布式映射系統(tǒng)的強一致性方案。首先,對映射服務(wù)器與接入交換路由器之間的通信流程和交互模塊進行重新設(shè)計,引入租約機制,通過在映射服務(wù)器與接入交換路由器之間建立租約關(guān)系,實現(xiàn)對映射條目租約的授予、維持與無效化,防止失效的映射關(guān)系被繼續(xù)使用,達到映射系統(tǒng)的強一致性。然后,在服務(wù)器端,記錄下使用過映射關(guān)系的接入交換路由器信息,當(dāng)映射關(guān)系發(fā)生改變后,服務(wù)器會主動向相應(yīng)的接入交換路由器列表通告其無效化。其次,在接入交換路由器端,對服務(wù)器返回的映射條目進行時長為租約期限的計時,當(dāng)租約到期后,接入交換路由器若想使用該映射條目需向服務(wù)器端驗證該條目的有效性;在收到服務(wù)器發(fā)送的無效通告后刪除過期映射條目,從而有效保證了緩存的映射信息在失效后不會被再次使用。最后,根據(jù)以上設(shè)計思路,對映射系統(tǒng)相關(guān)模塊進行編程實現(xiàn)。本文對上述方案進行了測試。功能測試結(jié)果表明,使用租約機制的映射系統(tǒng)能夠防止過期的映射關(guān)系被繼續(xù)使用,從而實現(xiàn)了映射系統(tǒng)的強一致性;性能測試結(jié)果表明,隨著映射關(guān)系改變頻率的降低或通信對端距離的減小,強一致性較弱一致性的性能提升會更顯著。論文結(jié)尾對全文工作予以總結(jié),并對后續(xù)工作進行了展望。
[Abstract]:With the rapid development of the network, the drawbacks of the original design of the Internet are increasingly reflected. The National Engineering Laboratory of next Generation Internet Interconnection equipment of Beijing Jiaotong University has put forward a intelligent cooperative network model, which separates the double meanings carried by various kinds of information by dividing the scope of "three layers" and "two domains". It effectively solves the problem of the existing network system. As the core of intelligent cooperative network, the mapping system separates the user's identity information from the location information, and provides storage management and parse query services for mapping relational items. When using the network communication, the access switching router will cache the mapping relation to the local area after obtaining the mapping relation of the communication end, so that the repeated query to the server is not necessary when used again, thus reducing the delay. When the communication to end mapping relationship changes, the access switch router can not synchronize with the server in time, and the previously cached mapping items will expire, resulting in consistency problem. Due to the weak consistency mechanism used in the current system, the sender will use the expired mapping relationship, which will cause the data to be sent to the wrong terminal, which will affect the communication process. Therefore, the consistency problem in the mapping system needs to be solved urgently. To solve this problem, this paper designs a strong consistency scheme for intelligent collaborative network distributed mapping system. Firstly, the communication flow and interaction module between the mapping server and the access switching router are redesigned, and the lease mechanism is introduced to establish the lease relationship between the mapping server and the access switching router. In order to achieve the strong consistency of the mapping system, the lease of mapping items is granted, maintained and invalidated, and the invalid mapping relationship is prevented from being used again. Then, on the server side, the information of the access switch router that used the mapping relation is recorded. When the mapping relation changes, the server will announce the invalidation to the corresponding list of access switch routers. Secondly, in the access switch router, the length of the mapping item returned by the server is the timing of the lease term. When the lease expires, the access switch router needs to verify the validity of the item to the server if it wants to use the mapping entry. After receiving an invalid notification from the server, the expired mapping entries are deleted, which effectively ensures that the cached mapping information will not be used again after failure. Finally, according to the above design ideas, the mapping system modules are programmed. The above scheme is tested in this paper. The functional test results show that the mapping system using the lease mechanism can prevent the expired mapping relationship from being used again, thus realizing the strong consistency of the mapping system, and the performance test results show that, With the decrease of the frequency of the mapping relationship or the decrease of the communication distance, the performance improvement of strong consistency is more significant than that of weak consistency. At the end of the paper, the paper summarizes the work of the paper, and looks forward to the follow-up work.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP393.0

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