What is a Secondary Namenode? Is it a substitute to the Namenode?
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Does this lead to security issues?
How Mapper is instantiated in a running job?
What is the problem with small files in Apache Hadoop?
How to exit the vi editor?
In which location Name Node stores its Metadata and why?
What is Your Cluster size ?
How can we change the split size if our commodity hardware has less storage space?
did you maintain the hadoop cluster in-house or used hadoop in the cloud?
What problems can be addressed by using Zookeeper?
What does the command mapred.job.tracker do?
How is HDFS fault tolerant?
What is the function of ApplicationMaster?