HARC: the highly-available resource co-allocator

Authors:
Jon MacLaren
Affiliations:
Centre for Computation & Technology, Louisiana State University, Baton Rouge, LA
Venue:
OTM'07 Proceedings of the 2007 OTM confederated international conference on On the move to meaningful internet systems: CoopIS, DOA, ODBASE, GADA, and IS - Volume Part II
Year:
2007

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Abstract

HARC--the Highly-Available Resource Co-allocator--is an open-source system for reserving multiple resources in a coordinated fashion. HARC can handle different types of resource, and has been used to reserve time on supercomputers across a US-wide testbed, together with dedicated lightpaths connecting the machines. At HARC's core are a distributed set of processes called Acceptors, which provide a coallocation service. HARC functions normally provided a majority of the Acceptors are working; this replication gives HARC its high availability. The Paxos Commit protocol ensures that consistency across all Acceptors is maintained. This paper gives an overview of HARC, and explains both how it works and how it is used. We show that HARC's design makes it easy for the community to contribute new components for co-allocating different types of resource, while the stability of the overall system is maintained.