Which are the two types of 'writes' in HDFS?
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Should we use RAID in Hadoop or not?
What is HDFS Block size? How is it different from traditional file system block size?
What is the default block size in hdfs?
What is zookeeper in hadoop?
Explain why do we need hadoop?
What Mapper does?
What is crontab? Explain with suitable example?
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?
How to keep HDFS cluster balanced?
What are the modes in which Apache Hadoop run?
Explain the Job OutputFormat?
What is a “Distributed Cache” in Apache Hadoop?
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