Improving MapReduce Performance in Heterogeneous Environments Matei Zaharia, Andy Konwinski, Anthony D. Joseph, Randy Katz, Ion Stoica University of California, Berkeley {matei,andyk,adj,randy,stoica}@cs.berkeley.edu Abstract MapReduce is emerging as an important programming model for large-scale data-parallel applications such as web indexing, data mining, and scientific simulation. Hadoo