What you can do with a tall-and-skinny QR factorization in Hadoop: Principal components and large regressions
Massive MapReduce Matrix Computations & Multicore Graph Algorithms
Hadoop basics
[Harvard CS264] 08b - MapReduce and Hadoop (Zak Stone, Harvard)
Tall-and-skinny Matrix Computations in MapReduce (ICME MR 2013)