Explain why do we need hadoop?
Mention what are the data components used by Hadoop?
Which command is used for the retrieval of the status of daemons running the hadoop cluster?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
What is the problem with HDFS and streaming data like logs
what should be the ideal replication factor in hadoop?
what are Task Tracker and Job Tracker?
what is meaning Replication factor?
Why do we need a password-less ssh in fully distributed environment?
Knox and Hadoop Development Tools?
What do shuffling do?
What is HDFS Block size? How is it different from traditional file system block size?
Is hadoop the future?