A Hadoop performance model for multi-rack clusters

Hadoop becomes de facto standard framework for big data analysis due to its scalability. Despite of the importance of Hadoop´s scalability, there are a few works have been made on the scalability in multi-rack clusters. In multi-rack clusters of real world, network topology becomes a major scalability bottleneck due to the limited network switch capacity. It is a waste of resources to add servers to a Hadoop cluster in such situation. Therefore, it is helpful for users to save cost by efficiently measuring the network influence to Hadoop before they add a new server to their clusters. In this paper, we describe a Hadoop performance model for the multi-rack clusters. We modeled network influence on Hadoop and achieved about 95% accuracy to the real measurement. Furthermore, we predicted Hadoop scalability in large clusters with our model and show Hadoop scales enough even in multi-rack clusters.