The most significant difference between the two, as per my view, is that HA eliminates the problem of 'NN as the single point of failure'. For a detailed info I would suggest you to visit the official web site. You might also find this link<http://blog.cloudera.com/blog/2011/02/hadoop-availability/> useful which talk about HA in great detail.
For your second question you can follow Bejoy sir's answer. Warm Regards, Tariq https://mtariq.jux.com/ cloudfront.blogspot.com On Tue, Jan 22, 2013 at 11:37 PM, <bejoy.had...@gmail.com> wrote: > Hi Savitha > > HA is a new feature n hadoop introduced in Hadoop 2.x releases. So It is a > new feature on top of Hadoop cluster. > > Ganglia is one of the widely used tools to monitor the cluster in detail. > On a basic hdfs and mapreduce level, the JobTracker and NameNode web UI > would give you a good consolidation on hadoop cluster. > Regards > Bejoy KS > > Sent from remote device, Please excuse typos > ------------------------------ > *From: * "Henjarappa, Savitha" <savitha.henjara...@hp.com> > *Date: *Tue, 22 Jan 2013 12:22:21 +0000 > *To: *user@hadoop.apache.org<user@hadoop.apache.org> > *ReplyTo: * user@hadoop.apache.org > *Subject: *Hadoop Cluster > > Hi, > > I am trying to understand the difference between HA cluster and Hadoop > cluster. Can this group help me understand, how differently Hadoop cluster > should be monitored? > > Thanks, > Savitha > > > >
