How we can change Replication factor when Data is on the fly?
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What stored in HDFS?
What is a Secondary Namenode? Is it a substitute to the Namenode?
What is a checkpoint?
How many maximum jvm can run on a slave node?
What problems have you faced when you are working on Hadoop code?
How is security achieved in Apache Hadoop?
Explain how do ‘map’ and ‘reduce’ works?
What are channel selectors?
What is the port number for NameNode
What is the function of NodeManager?
How does master slave architecture in the hadoop?
What is a block and block scanner in HDFS?