How does a namenode handle the failure of the data nodes?
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What is a “Distributed Cache” in Apache Hadoop?
What exactly is hadoop?
How is security achieved in Apache Hadoop?
What is structured data?
What do you know about nlineoutputformat?
How many maximum jvm can run on a slave node?
How would you use Map/Reduce to split a very large graph into smaller pieces and parallelize the computation of edges according to the fast/dynamic change of data?
What are the important differences between apache and hadoop?
Can you explain how do ‘map’ and ‘reduce’ work?
Which files are used by the startup and shutdown commands?
What is the full form of fsck?
What are the port numbers of namenode, job tracker and task tracker?