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What are the differences between hadoop 1 and hadoop 2?
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If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?
Where is hadoop-env.sh file present?
How can one write custom record reader?
Can hadoop replace relational database?
Which modes can Hadoop be run in? List a few features for each mode?
What are the port numbers of job tracker?
What is a namenode?
What is fsck?
Explain what is hadoop?
Why do we need Hadoop Archives? How is it created?
Why is checkpointing important in hadoop?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?
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