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Compare Apache Hadoop and Apache Spark?
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What happens when two clients try to access the same file in the hdfs?
Which scala library is used for functional programming?
List out some common problems faced by data analyst?
Which modes can Hadoop be run in? List a few features for each mode?
Can you explain the common input formats in hadoop?
What is a namenode?
What happens in text format?
Have you ever used counters in hadoop?
Can we create a hadoop cluster from scratch?
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?
Can you explain rack awareness?
What is a commodity hardware? Does commodity hardware include RAM?
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