What is the heartbeat used for?
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What is a 'block' in HDFS?
How many instances of tasktracker run on a hadoop cluster?
Is client the end user in HDFS?
What is Rack Awareness in Apache Hadoop?
Why do we use Hadoop?
Explain the Job OutputFormat?
Explain Erasure Coding in Apache Hadoop?
Where is the Mapper Output intermediate kay-value data stored ?
Why do we need a password-less ssh in fully distributed environment?
Why password is needed in ssh localhost?
Name some companies that use Hadoop?
What are the problems with Hadoop 1.0?