Hadoop is Consistent and partition tolerant, i.e. It falls under the CP category of the CAP theoram.
Hadoop is not available because all the nodes are dependent on the name node. If the name node falls the cluster goes down.
But considering the fact that the HDFS cluster has a secondary name node why cant we call hadoop as available. If the name node is down the secondary name node can be used for the writes.
What is the major difference between name node and secondary name node that makes hadoop unavailable.
Thanks in advance.