What is a checkpoint?
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How can I restart namenode?
How does NameNode tackle DataNode failures?
What is a Combiner?
What are the four characteristics of Big Data?
What is zookeeper in hadoop?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
What are the additional benefits YARN brings in to Hadoop?
What is the meaning of speculative execution in Hadoop? Why is it important?
What is InputSplit and RecordReader?
Which data storage components are used by hadoop?
Why the name ‘hadoop’?
What is a secondary namenode?