我试着在ec2中开始hadoop的工作，就像

$ ./start-yarn.sh

我得到以下信息

starting yarn daemons
starting resourcemanager, logging to /home/ubuntu/library/hadoop/hadoop-2.2.0/logs/yarn-ubuntu-resourcemanager-ip-x-x-x-x.out
localhost: Warning: Permanently added the ECDSA host key for IP address 'x.x.x.x' to the list of known hosts.
localhost: starting nodemanager, logging to /home/ubuntu/library/hadoop/hadoop-2.2.0/logs/yarn-ubuntu-nodemanager-ip-x-x-x-x.out

当我尝试的时候 $ jps 我没有看到resourcemanager正在运行。当我检查 yarn-ubuntu-resourcemanager-ip-x-x-x-x.out 文件，我明白了，

ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 7862
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 7862
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

ps:我已经将ip，x.x.x.x localhost添加到中的主机列表中 /etc/hosts 我应该如何调试这个？