Because for large clusters we have to run namenode in a single node, datanode in another nodes So we can start namenode and jobtracker in master node and datanode n tasktracker in slave nodes
For getting more clarity You can check the service status after starting Verify these: dfs.name.dir hdfs:hadoop drwx------ dfs.data.dir hdfs:hadoop drwx------ mapred.local.dir mapred:hadoop drwxr-xr-x Please follow each steps in this link https://ccp.cloudera.com/display/CDHDOC/CDH3+Deployment+on+a+Cluster On Mar 15, 2012 9:52 PM, "Manish Bhoge" <manishbh...@rocketmail.com> wrote: > Ys, I understand the order and I formatted namenode before starting > services. As I suspect there may be ownership and an access issue. Not able > to nail down issue exactly. I also have question why there are 2 routes to > start services. When we have start-all.sh script then why need to go to > init.d to start services?? > > > Thank you, > Manish > Sent from my BlackBerry, pls excuse typo > > -----Original Message----- > From: Manu S <manupk...@gmail.com> > Date: Thu, 15 Mar 2012 21:43:26 > To: <common-user@hadoop.apache.org>; <manishbh...@rocketmail.com> > Reply-To: common-user@hadoop.apache.org > Subject: Re: Issue when starting services on CDH3 > > Did you check the service status? > Is it like "dead, but pid exist"? > > Did you check the ownership and permissions for the > dfs.name.dir,dfs.data.dir,mapped.local.dir etc ? > > The order for starting daemons are like this: > 1 namenode > 2 datanode > 3 jobtracker > 4 tasktracker > > Did you format the namenode before starting? > On Mar 15, 2012 9:31 PM, "Manu S" <manupk...@gmail.com> wrote: > > > Dear manish > > Which daemons are not starting? > > > > On Mar 15, 2012 9:21 PM, "Manish Bhoge" <manishbh...@rocketmail.com> > > wrote: > > > > > > I have CDH3 installed in standalone mode. I have install all hadoop > > components. Now when I start services (namenode,secondary namenode,job > > tracker,task tracker) I can start gracefully from /usr/lib/hadoop/ > > ./bin/start-all.sh. But when start the same servises from > > /etc/init.d/hadoop-0.20-* then I unable to start. Why? Now I want to > start > > Hue also which is in init.d that also I couldn't start. Here I suspect > > authentication issue. Because all the services in init.d are under root > > user and root group. Please suggest I am stuck here. I tried hive and it > > seems it running fine. > > > Thanks > > > Manish. > > > Sent from my BlackBerry, pls excuse typo > > > > > > >
