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What is data cleansing?
If DataNode increases, then do we need to upgrade NameNode?
What is CAP Theorem? What aspects does Hadoop support from this theorem?
Explain Erasure Coding in Hadoop?
When should be hadoop archive create?
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?
After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?
Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?
Are there any special requirements for namenode?
What are the hadoop configuration files at present?
List out some common problems faced by data analyst?
Where is hadoop-env.sh file present?
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