How can you set an arbitrary number of mappers to be created for a job in Hadoop?
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What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
What is a commodity hardware? Does commodity hardware include RAM?
What is difference between secondary namenode, checkpoint namenode & backupnode?
What is the hadoop-core configuration?
What are the important features of hadoop?
Explain the core methods of the reducer?
Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?
Ideally what should be the replication factor in hadoop?
What do you know about the speculative execution?
Name the most common Input Formats defined in Hadoop? Which one is default?
Define data cleansing?
Do we require two servers for the namenode and the datanodes?
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