How does NameNode tackle DataNode failures?
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What is small file problem in hadoop?
How is HDFS fault tolerant?
What do you know about keyvaluetextinputformat?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
How the HDFS Blocks are replicated?
Explain what if rack 2 and datanode fails?
What are the important differences between apache and hadoop?
How to use Apache Zookeeper command line interface?
What is Row Key?
What is inputsplit in hadoop? Explain.
How will you make changes to the default configuration files?
Explain the shuffle?