What is HDFS Block size? How is it different from traditional file system block size?
What stored in HDFS?
Explain the Job OutputFormat?
What is a Task instance in Hadoop? Where does it run?1
Define a commodity hardware? Does commodity hardware include ram?
How is the option in Hadoop to skip the bad records?
How will you make changes to the default configuration files?
Which data storage components are used by hadoop?
what are the steps involved in decommissioning removing
Are Namenode and job tracker on the same host?
What is a heartbeat in HDFS?
How does a namenode handle the failure of the data nodes?
Can you explain how do ‘map’ and ‘reduce’ work?
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