Have you ever used counters in hadoop?
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What are the important features of hadoop?
If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?
Explain what is storage and compute nodes?
How can you set an arbitrary number of mappers to be created for a job in Hadoop?
What does the mapred.job.tracker command do?
What is a commodity hardware? Does commodity hardware include RAM?
What does hadoop-metrics.properties file do?
What are the benefits yarn brings in to hadoop?
What is Mapper? How can we compress Mapper output in Hadoop?
Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?
Where is hadoop-env.sh file present?
Give me an example of document database ?
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