| Author | Kriengsak Kiatsirivatana |
| Call Number | AIT Thesis no.CS-98-13 |
| Subject(s) | World Wide Web (Information retrieval system)
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, Scholl of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Abstract | A system of distributed cache servers connected together hierarchically has been widely
adopted in practice today. At the top of the hierarchy, a large cache server called hub cache
retrieves information from the original source or from some other high-speed caches to feed a
community of somewhat smaller children, here referred to as rim cache. Normally, the rim
cache sends WWW document requests to its parent hub cache. The hub cache retrieves the
requested WWW document from its own cache or from the original WWW server and then
sends the requested documents to the requesting rim caches. To enhance the cache
performance by distributing WWW objects among the member Gaches, we propose to add a
new feature where the hub cache multicasts popular WWW document obtained to all
connecting rim caches regularly, so replicated copies are kept on the member rim caches. In
other words, the hub cache pushes popular documents to all members while less popular
documents are fetched from the hub cache by the rim caches upon demand (pull). Replicated
objects are thus kept closer to the clients improving the cache hit rates and reducing the WWW
access time at the clients.
To multicast web objects continuously over the network, one is risking the fact that
multicasting packets could easily flood the network. Thus a scheduling mechanism is required
to manage the multicasting process taking into consideration the error control, the bandwidth
consumption, traffic congestion control and the scope of the multicast transmission from hub
cache to all connecting rim caches. In this thesis, an adaptive sender based approach is
proposed and implemented. Experimental results have confirmed that this approach
significantly improves the transmission time, consumes low and static bandwidth consumption,
as well as has low retransmission ratio. |
| Year | 1998 |
| Type | Thesis |
| School | School of Advanced Technologies (SAT) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Computer Science (CS) |
| Chairperson(s) | Kanchana Kanchanasut ; |
| Examination Committee(s) | Huynh Ngoc Phien ;Aekavute Sujarae ; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1998 |