Giraph builds upon the graph-oriented nature of Pregel but additionally adds fault-tolerance to the coordinator process with the use of ZooKeeper as its centralized coordination service.
Its implemented a graph-processing framework that is launched as a typical Hadoop job to leverage existing Hadoop infrastructure, such as Amazon's EC2.
Giraph follows the bulk-synchronous parallel model relative to graphs where vertices can send messages to other vertices during a given superstep.
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