What is safe mode in Hadoop?
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What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What does /var/hadoop/pids do?
Explain use cases where SequenceFile class can be a good fit?
What is a “Distributed Cache” in Apache Hadoop?
What are the four characteristics of Big Data?
Can we call vms as pseudos?
What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?
Can the balancer be run while Hadoop is in use?
What is a Task instance in Hadoop? Where does it run?1
Is secondary namenode a substitute to the namenode?
What are the functions of NameNode?
Is hadoop open source?