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What is the purpose of context object?
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Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?
What sorts of actions does the job tracker process perform?
Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?
What is difference between reducer and combiner?
What is the difference between namenode and datanode in hadoop?
What happens if you don?t override the mapper methods and keep them as it is?
Explain what is sequencefileinputformat?
Why slaves limited to 4000 in hadoop version 1?
How namenode handles data node failures?
Have you ever used counters in hadoop?
What is tasktracker in hadoop?
What are the configuration files in Hadoop?
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