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Are job tracker and task trackers present in separate machines?
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Mention what daemons run on a master node and slave nodes?
If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?
How does speculative execution work in Hadoop?
Clarify what is sequence file input format?
How often DataNode send heartbeat to NameNode in Hadoop?
Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?
Is it possible to have hadoop job output in multiple directories? If yes, how?
What are the core components of Hadoop?
What is hadoop? Name the main components of a hadoop application?
What is the default replication factor in Hadoop and how will you change it?
Can you give some examples of Big Data?
Explain what is speculative execution?
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