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Hadoop Interview questions


Total available count: 27
Subject - Apache
Subsubject - Hadoop
1
Why Spark, even Hadoop exists?
2
Why both Spark and Hadoop needed?
3
How do you define SparkContext?
4
How can you define SparkConf?
5
How do you define RDD?
6
What are the possible operations on RDD?
7
What is the transformation?
8
How do you define actions?
9
What is Preferred Locations?
10
How many type of transformations exist?
11
What is Narrow Transformations?
12
What is wide Transformations?
13
Data is spread in all the nodes of cluster, how spark tries to process this data?
14
What is Shuffling?
15
What is checkpointing?
16
Define Spark architecture?
17
What is the purpose of Driver in Spark Architecture?
18
What are the workers?
19
Please explain, how workers work, when a new Job submitted to them?
20
Please define executors in detail?
21
What is DAGSchedular and how it performs?
22
What is Task, with regards to Spark Job execution?
23
What is Speculative Execution of a tasks?
24
What is a BlockManager?
25
Who uses Cassandra?
26
What do you understand by Snitches?
27
What is Hector?