Abstract
Recent programmable switches allow developers to profoundly optimize network elements. In this study, we introduce a concept of an application switch that supports a network application based on programmable switches. A developer can optimize not only server computers but also application switches to improve the application performance by implementing functions of the network application. We then introduce a method to apply an application switch to a database management system using the transmission control protocol (TCP). The method migrates a TCP connection from a server computer to the application switch when the switch replies to a query. The method reversely migrates it to the server computer again when a query is processed by the server. The application switch manages the TCP sequence and the Ack numbers for these migrations. In the existing work, we implemented a prototype key-value store (KVS) system based on the proposed system without TCP Ack management. We then showed the potential of the method. In this paper, we show the problem of the prototype system of Ack management and propose a method for solving the problem. In addition, we evaluate the resolved method and demonstrate its effectiveness.
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