Presence-based availability and P2P systems

The availability of a P2P service is a function of the individual peers' availabilities, and it is often desirable to estimate how available a particular P2P service will be given the availability of its peers. Prior work in this area has widely used the fraction of time the average peer is ava...

Full description

Saved in:
Bibliographic Details
Main Authors: Dunn, R.J., Zahorjan, J., Gribble, S.D., Levy, H.M.
Format: Conference Proceeding
Language:English
Subjects:
Availability
Internet
Parameter estimation
Peer to peer computing
Reflection
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The availability of a P2P service is a function of the individual peers' availabilities, and it is often desirable to estimate how available a particular P2P service will be given the availability of its peers. Prior work in this area has widely used the fraction of time the average peer is available as the basis for this estimate. It is shown that this approach has serious drawbacks. The authors developed a different measure, which is called presence-based availability, which takes into account the availability of the individual peers. Using traces of live P2P systems taken from the literature, the authors demonstrated that presence-based availability is a more reliable indicator of potential performance than prior methods. It is shown that this metrics successfully estimate the availability of a P2P file-sharing system. Then, using presence-based measures to make a better estimate of a parameter in a highly-available system, we achieve a 75% decrease in resource usage relative to an existing technique relying on traditional metrics.
ISSN:2161-3559
DOI:10.1109/P2P.2005.27