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What is a speculative execution in Apache Hadoop MapReduce?


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More Apache Hadoop Interview Questions

What is cloudera and why it is used?

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What is the difference between SQL and NoSQL?

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What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

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What is IdentityMapper?

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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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What is the Use of SSH in Hadoop ?

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How to resolve small file problem in hdfs?

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What is Safemode in Apache Hadoop?

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did you maintain the hadoop cluster in-house or used hadoop in the cloud?

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How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

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What is the difference between a Hadoop and Relational Database and Nosql?

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How can you overwrite the replication factors in HDFS?

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