### Abstract

Designing an overlay network for publish/subscribe communication in a system where nodes may subscribe to many different topics of interest is of fundamental importance. For scalability and efficiency, it is important to keep the degree of the nodes in the publish/subscribe system low. It is only natural then to formalize the following problem: Given a collection of nodes and their topic subscriptions connect the nodes into a graph which has least possible maximum degree and in such a way that for each topict, the graph induced by the nodes interested in t is connected. We present the first polynomial time logarithmic approximation algorithm for this problem and prove an almost tight lower bound on the approximation ratio. Our experimental results show that our algorithm drastically improves the maximum degree of publish/subscribe overlay systems. We also propose a variation of the problem by enforcing that each topic-connected overlay network be of constant diameter, while keeping the average degree low. We present a heuristic for this problem which guarantees that each topic-connected overlay network will be of diameter 2 and which aims at keeping the overall average node degree low. Our experimental results validate our algorithm showing that our algorithm is able to achieve very low diameter without increasing the average degree by much.

Original language | English (US) |
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Title of host publication | IEEE INFOCOM 2009 - The 28th Conference on Computer Communications |

Pages | 882-890 |

Number of pages | 9 |

DOIs | |

State | Published - Oct 12 2009 |

Event | 28th Conference on Computer Communications, IEEE INFOCOM 2009 - Rio de Janeiro, Brazil Duration: Apr 19 2009 → Apr 25 2009 |

### Publication series

Name | Proceedings - IEEE INFOCOM |
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ISSN (Print) | 0743-166X |

### Other

Other | 28th Conference on Computer Communications, IEEE INFOCOM 2009 |
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Country | Brazil |

City | Rio de Janeiro |

Period | 4/19/09 → 4/25/09 |

### ASJC Scopus subject areas

- Computer Science(all)
- Electrical and Electronic Engineering

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## Cite this

*IEEE INFOCOM 2009 - The 28th Conference on Computer Communications*(pp. 882-890). [5061998] (Proceedings - IEEE INFOCOM). https://doi.org/10.1109/INFCOM.2009.5061998