I modified sbin/hadoop-daemon.sh, where HADOOP_PID_DIR is set. It works! Everything looks fine now.
Seems direct command "hdfs namenode" gives a better sense of control :) Thanks a lot. 在 2013年4月18日星期四，Harsh J 写道： > Yes you can but if you want the scripts to work, you should have them > use a different PID directory (I think its called HADOOP_PID_DIR) > every time you invoke them. > > I instead prefer to start the daemons up via their direct command such > as "hdfs namenode" and so and move them to the background, with a > redirect for logging. > > On Thu, Apr 18, 2013 at 2:34 PM, Lixiang Ao <aolixi...@gmail.com> wrote: > > Hi all, > > > > Can I run mutiple HDFS instances, that is, n seperate namenodes and n > > datanodes, on a single machine? > > > > I've modified core-site.xml and hdfs-site.xml to avoid port and file > > conflicting between HDFSes, but when I started the second HDFS, I got the > > errors: > > > > Starting namenodes on [localhost] > > localhost: namenode running as process 20544. Stop it first. > > localhost: datanode running as process 20786. Stop it first. > > Starting secondary namenodes [0.0.0.0] > > 0.0.0.0: secondarynamenode running as process 21074. Stop it first. > > > > Is there a way to solve this? > > Thank you in advance, > > > > Lixiang Ao > > > > -- > Harsh J >
