then, do not start secondary namenode ( comment the last line of start-dfs.sh # "$bin"/hadoop-daemons.sh --config $HADOOP_CONF_DIR --hosts masters start secondarynamenode )
On Wed, Sep 8, 2010 at 11:36 PM, akhilesh.kumar <akhilesh.ku...@zapak.co.in> wrote: > Hi , > Can any one help me in disabling secondary namenode feature of hdfs . > > Regards > Akhilesh > > -----Original Message----- > From: ChingShen [mailto:chingshenc...@gmail.com] > Sent: Thursday, September 09, 2010 12:07 PM > To: common-user@hadoop.apache.org > Subject: Questions about BN and CN > > Hi all, > > I got the Backup node(BN) that includes all the checkpoint > responsibilities, > and it maintains an up-to-date namespace state, which is always in > sync with the active NN. > > Q1. In which situation do we need a CN? > > Q2. If the NameNode machine fails, which different manual > intervention between BN and CN? > > Thanks. > > Shen > > -- Best Regards Jeff Zhang
