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Late Join Algorithms for Distributed Interactive Applications

Author(s): Jürgen Vogel, Martin Mauve, Volker Hilt, Wolfgang Effelsberg.
Title: Late Join Algorithms for Distributed Interactive Applications
Published: ACM/Springer Multimedia Systems 9 (4), pp. 327-336, October 2003
Keyword(s): Late Join, Distributed Interactive Applications, Consistency Control, RTP/I
Abstract: Distributed interactive applications such as shared whiteboards andmultiplayer games often support dynamic groups where users mayjoin and leave at any time. A participant joining an ongoing sessionhas missed the data that have previously been exchanged by the othersession members. It is therefore necessaryto initialize the application instance of the latecomer with thecurrent state. In this paper, we propose a late join algorithmfor distributed interactive applications that provides such aninitialization of applications. The algorithm is scalable androbust and can be easily adapted to the needs of different applicationsby means of late join policies. The behavior of the late joinalgorithm and the impact of design alternatives are investigated in detailby means of an extensive simulation study. This study also shows thatan improper handling of the late join problem can cause very highapplication and network load.
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