On Wed, Aug 12, 2009 at 8:58 AM, llpind <sonny_h...@hotmail.com> wrote:
> > Playing with the HBase perfomanceEval Class, but it seems to take a long > time to run “sequentialWrite 2” (~20 minutes). If I simply emulate 1 > clients in a simple program, I can do 1 Million Puts in about 3 minutes > (non > mapred). The sequential write is writing 2 million with 2 clients. Please > help in understanding how to use the performanceEvaluation Class. > If the number of clients is > 1, unless you add the '--nomapred' (sp?) argument, PE launches a mapreduce program of N tasks. Each task puts up a client writing 1M rows (IIRC). Try N where N == number_of_map_slots and see what that does? N == 2 probably won't tell you much. You could also set an N > 1 and use the '--nomapred'. This will run PE clients in a distinct thread. For small numbers of N, this can put up heavier loading than MR with its setup and teardown cost. St.Ack
