  Cloud computing has demonstrated that processing very large datasets over
commodity clusters can be done simply given the right programming model and
infrastructure. In this paper, we describe the design and implementation of the
Sector storage cloud and the Sphere compute cloud. In contrast to existing
storage and compute clouds, Sector can manage data not only within a data
center, but also across geographically distributed data centers. Similarly, the
Sphere compute cloud supports User Defined Functions (UDF) over data both
within a data center and across data centers. As a special case, MapReduce
style programming can be implemented in Sphere by using a Map UDF followed by a
Reduce UDF. We describe some experimental studies comparing Sector/Sphere and
Hadoop using the Terasort Benchmark. In these studies, Sector is about twice as
fast as Hadoop. Sector/Sphere is open source.
