Hi everybody, i want to do DFSIO test on my hadoop cluster. I wanna know which parameter, show the number of parallel task on a data node? i mean what is the name of the parameter and where is it? i want to change it , and analyze the results. thank u very much. i have read an article, in this link; https://pdfs.semanticscholar.org/e874/ed1a4b120bb4caf5c2ecb440f49df7819d54.pdf In this article, they use these parameters for DFSIO test: BufferSize: 1000000 bytes Replication factor: 3 Number of tasks in parallel by node: 2 Block size: 64 MB what is the "Number of tasks in parallel by node" , and where can i set it in hortonworks hadoop? ... View more