What is HDFS block size and what did you chose in your project?
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What are the modes in which Apache Hadoop run?
How does NameNode tackle DataNode failures?
Have you ever used Counters in Hadoop. Give us an example scenario?
How to Administering Hadoop?
What is the difference between Apache Hadoop and RDBMS?
How to resolve small file problem in hdfs?
How can one increase replication factor to a desired value in Hadoop?
Is map like a pointer?
Define a metadata?
What is the meaning of speculative execution in Hadoop? Why is it important?
What do masters consist of?
Explain the benefits of block transfer?