What is heartbeat in hdfs? Explain.
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List out Hadoop's three configuration files?
Mention what is the hadoop mapreduce apis contract for a key and value class?
how can you check whether Namenode is working beside using the jps command?
What is Distributed Cache in the MapReduce Framework?
What is the purpose of textinputformat?
Explain how do ‘map’ and ‘reduce’ work?
What does a split do?
Explain slot in Hadoop Map-Reduce v1?
Explain about the partitioning, shuffle and sort phase
Can there be no Reducer?
When should you use a reducer?
Explain what is distributed cache in mapreduce framework?
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