What are active and passive "NameNodes"?
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what is the default replication factor in HDFS?
Explain a simple Map/Reduce problem.
Is secondary namenode a substitute to the namenode?
What will be the consideration while we do Hardware Planning for Master in Hadoop architecture?
What happens to a NameNode that has no data?
What are the modes in which Apache Hadoop run?
what is meaning Replication factor?
What is the problem with small files in Apache Hadoop?
Where is the Mapper Output intermediate kay-value data stored ?
How we can change Replication factor when Data is on the fly?
Can Hadoop be compared to NOSQL database like Cassandra?
How to keep HDFS cluster balanced?