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Mention how hadoop is different from other data processing tools?
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Can you explain rack awareness?
Can you explain speculative execution?
What are the actions followed by hadoop?
List out some common problems faced by data analyst?
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?
what happens when namenode goes down during file read operation in hadoop?
Why would nosql be better than using a sql database? And how much better is it?
What is a combiner in hadoop?
Which are the three modes in which hadoop can be run?
What is data cleansing?
Do we need to place 2nd and 3rd data in rack 2 only?
What webdav is in hadoop?
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