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Why are the number of splits equal to the number of maps?
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Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?
Define a namenode?
Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?
Explain InputFormat?
On what basis name node distribute blocks across the data nodes?
What is the difference between Hadoop and Traditional RDBMS?
Why is Apache Spark faster than Apache Hadoop?
How many instances of JobTracker can run on a Hadoop Cluser?
Mention what is the number of default partitioner in Hadoop?
What is a block and block scanner in HDFS?
What is the InputFormat ?
Can hbase run without hadoop?
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