Un-Answered Questions { All }

What is a Backup node in Hadoop?

255


What do you mean by the NameNode High Availability in hadoop?

252


What is the default replication factor in Hadoop and how will you change it?

282


Why Hadoop performs replication, although it results in data redundancy?

1030


What is Balancer in Hadoop?

216


What is active and passive NameNode in Hadoop?

247


How can one check whether NameNode is working or not?

271


How would you restart NameNode?

217


How NameNode tackle Datanode failures in Hadoop?

236


Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

245


If DataNode increases, then do we need to upgrade NameNode in Hadoop?

240


What is meant by streaming access?

282


How to add/delete a Node to the existing cluster?

259


What is Mapper in Hadoop?

251


What is Reducer in Hadoop?

250