What is output format in hadoop?
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How the HDFS Blocks are replicated?
Mention what are the data components used by Hadoop?
Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
If a data Node is full how it's identified?
how would you modify that solution to only count the number of unique words in all the documents?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
Define tasktracker.
What is the meaning of the term "non-DFS used" in Hadoop web-console?
What is the jobtracker?
What will be the consideration while we do Hardware Planning for Master in Hadoop architecture?
What stored in HDFS?
What if a namenode has no data?
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