In shared-nothing database systems, data often needs to be moved whenever there is a join or an aggregation process for which the data requires repartitioning across the segments. As a result, the interconnect serves as one of the most critical components within Greenplum Database. Greenplum’s gNet interconnect (Figure 8m) optimizes the flow of data to allow continuous pipelining of processing without blocking on all nodes of the system. The gNet interconnect is tuned and optimized to scale to tens of thousands of processors and leverages commodity Gigabit Ethernet and 10GigE switch technology. At its core, the gNet software interconnect is.
