## Abstract

Multiple-choice load balancing has been a topic of intense study since the seminal paper of Azar, Broder, Karlin, and Upfal. Questions in this area can be phrased in terms of orientations of a graph, or more generally a k-uniform random hypergraph. A (d,b)-orientation is an assignment of each edge to d of its vertices, such that no vertex has more than b edges assigned to it. Conditions for the existence of such orientations have been completely documented except for the "extreme" case of (k-1,1)-orientations. We consider this remaining case, and establish:

- The density threshold below which an orientation exists with high probability, and above which it does not exist with high probability.

- An algorithm for finding an orientation that runs in linear time with high probability, with explicit polynomial bounds on the failure probability.

Previously, the only known algorithms for constructing (k-1,1)-orientations worked for k<=3, and were only shown to have expected linear running time.

- The density threshold below which an orientation exists with high probability, and above which it does not exist with high probability.

- An algorithm for finding an orientation that runs in linear time with high probability, with explicit polynomial bounds on the failure probability.

Previously, the only known algorithms for constructing (k-1,1)-orientations worked for k<=3, and were only shown to have expected linear running time.

Original language | English |
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Journal | Algorithmica |

ISSN | 0178-4617 |

Publication status | Published - Jan 2013 |

## Keywords

- Multiple-choice hashing
- , random hypergraphs
- orientations