hi，I am in trouble about that I have 3 hadoop node with 3 ceph node, but when i start a mapreduce task, I couldn’t controll the map number.
in a word, there is only one hadoop node runing task.
how can i run a mapreduce task on multi-nodes?
ps: when with hdfs, I can change the dfs.block.size and -D mapreduce.job.maps=30 to change map number, but I can not change map number with ceph
pps: I am not a native speaker of English. I may express a problem with my tone, but I am very sincere. I hope to get your answer. Thank you very much.
/usr/local/hadoop-2.7.7/bin/hadoop jar /usr/local/hadoop-2.7.7/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.7.jar teragen -D mapreduce.job.maps=30 -D mapreduce.job.reduces=0 1073741824 /user/input/terasort/100G-input