Can the balancer be run while Hadoop is in use?
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What is speculative execution in Hadoop?
Why do we need a password-less ssh in fully distributed environment?
What is Rack awareness?
How can we look for the namenode in the browser?
What is Schema on Read and Schema on Write?
Why the name ‘hadoop’?
Is client the end user in HDFS?
Explain what is the purpose of RecordReader in Hadoop?
What is the difference between Hadoop and Traditional RDBMS?
Define tasktracker.
What is a heartbeat in HDFS?
How to come out of the insert mode?
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