Answer / Rakesh Vishwakarma

Common types of NoSQL databases include Document-oriented (MongoDB, Couchbase), Key-value stores (Riak, Redis), Column-family stores (Cassandra, HBase), and Graph databases (Neo4j, OrientDB).

Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

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If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

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What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

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How jobtracker assign tasks to the tasktracker?

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What are the major differences between Hadoop 2 and Hadoop 3?

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Clarify what is sequence file input format?

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What is a combiner in hadoop?

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When and how to create hadoop archive?

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How does speculative execution work in Hadoop?

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What do you mean by the NameNode High Availability in hadoop?

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What do you understand by standalone (or local) mode?

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Clarify how job tracker schedules an assignment?

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