What is a namenode? How many instances of namenode run on a hadoop cluster?
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how to share the metastore within multiple users?
How Mapper is instantiated in a running job?
How can one increase replication factor to a desired value in Hadoop?
Can we do online transactions(oltp) using hadoop?
What are combiners and its purpose?
what are Task Tracker and Job Tracker?
Explain the wordcount implementation via hadoop framework ?
Which data storage components are used by hadoop?
What is Rack Awareness in Apache Hadoop?
Should we use RAID in Hadoop or not?
Is hadoop a database?
What do you know about sequencefileinputformat?
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