How often DataNode send heartbeat to NameNode in Hadoop?
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Does hadoop follows the unix pattern?
What happen when namenode enters in safemode in hadoop?
What are configuration files in Hadoop?
What is Federation?
Give a brief overview of Hadoop history?
Have you ever used counters in hadoop?
Explain what is webdav in hadoop?
Explain the common input formats in hadoop?
How to do ‘map’ and ‘reduce’ works?
Why do we need Hadoop?
Which operating system(s) are supported for production hadoop deployment?
What is the hadoop-core configuration?
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