Have you ever used Counters in Hadoop. Give us an example scenario?
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If a data Node is full how it's identified?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
What is MapFile?
What is the meaning of speculative execution in Hadoop? Why is it important?
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?
Does google use hadoop?
What is HDFS - Hadoop Distributed File System?
Define streaming access?
Whats is distributed cache in hadoop?
What is Your Cluster size ?
Can NameNode and DataNode be a commodity hardware?
On what basis Namenode will decide which datanode to write on?
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