Title :
A task-based adaptive TTL approach for Web server load balancing
Author :
Chatterjee, Devarshi ; Tari, Zahir ; Zomaya, Albert
Author_Institution :
Sch. of Comput. Sci. & IT, RMIT Univ., Melbourne, Vic., Australia
Abstract :
Web sites attracting a high client-traffic cannot simply rely on either mirrored servers or a single server to balance the client-request generated load. DNS load balancing techniques have shown their advantages in dealing with heavy Web traffic. These techniques use the time-to-live (TTL) value associated with a name-to-address translation. Unfortunately name-to-address translations are cached in intermediate name servers for a period defined by the TTL This results in all requests reaching the same Web server for this TTL period. The proposed adaptive-TTL approach (called DLB-TS - dynamic load balancing based on task size) takes into account the time taken to fetch a document while choosing the least loaded server. To alleviate the problems of client-side caching and non-cooperative intermediate name servers, a server-side redirection is proposed and implemented. Though the algorithm caused degraded performance because of server-side load balancing under a light load, it reduced the client perceived latency by at least 16% when compared to existing size-based algorithms.
Keywords :
Internet; cache storage; client-server systems; file servers; resource allocation; Web server load balancing; Web sites; Web traffic; client-request generated load; client-side caching; dynamic load balancing based on task size; name-to-address translation; noncooperative intermediate name servers; server-side load balancing; server-side redirection; time-to-live; Australia; Bandwidth; Computer science; Degradation; Delay; Information technology; Internet; Load management; Uniform resource locators; Web server;
Conference_Titel :
Computers and Communications, 2005. ISCC 2005. Proceedings. 10th IEEE Symposium on
Print_ISBN :
0-7695-2373-0
DOI :
10.1109/ISCC.2005.19