Can you give us some more details about ssh communication between masters and the slaves?

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Are Namenode and job tracker on the same host?

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What does ‘jps’ command do?

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What is HDFS ? How it is different from traditional file systems?

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What is difference between regular file system and HDFS?

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shouldn't DFS be able to handle large volumes of data already?

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What do you know by storage and compute node?

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What is the purpose of dfsadmin tool?

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What is the default block size in hdfs?

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how can we change Replication Factor?

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What is a spill factor with respect to the ram?

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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?

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