我正在运行一个本地进程，其URL配置为hdfs：// localhost：9000。 HDFS是一个Hadoop文件系统协议。
While I perform a Unix command on Ubuntu 12.0, it gives below error -
Call From localhost/127.0.0.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused;
My /etc/hosts file has below details -
127.0.0.1 localhost
127.0.0.1 ubuntu
/# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
SSH is also in running mode. Not sure how to resolve it. Pleas provide your input.