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Top 32 Hadoop Interview Questions

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Hadoop Theoretical Questions

Q1:   

What are the core concepts of the Apache Hadoop framework?

  
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Q2:   

Is Apache Hadoop a Database?

  
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Q3:   

What's the difference between Active and StandBy NameNodes in Apache Hadoop?

  
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Q4:   

What are the most common InputFormats in Hadoop?

  
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Q5:   

How Does Hadoop Work?

  
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Q6:   

What are the Modes in which Hadoop runs?

  
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Q7:   

When would you add Nodes to a running Hadoop cluster?

  
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Q8:   

Can you provide an example of how MapReduce works in Apache Hadoop?

  
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Q9:   

Briefly explain the Hadoop Cluster Architecture

  
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Q10:   

What are some common reasons why a Hadoop job may be pending?

  
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Q11:   

What are the Join Strategies available in Hadoop MapReduce?

  
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Q12:   

What types of Nodes can you have in the HDFS?

  
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Q13:   

What Are Counters in Hadoop?

  
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Q14:   

How does rack awareness work in HDFS?

  
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Q15:   

What is the role of the ResourceManager and NodeManager in YARN?

  
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Q16:   

What's the difference between HDFS and HBase in Hadoop?

  
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Q17:   

What Is the difference between Split Size and Block Size in Hadoop?

  
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Q18:   

What is Hadoop Speculative Task Execution and when would you use it?

  
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Q19:   

How can you fix multiple Hadoop jobs that don't exit?

  
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Q20:   

What is the difference between Map-Side Join and Reduce Side Join in Hadoop?

  
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Q21:   

What are the differences between regular FileSystem and HDFS in Apache Hadoop?

  
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Q22:   

Can you provide a high-level overview of how to develop a MapReduce application in Apache Hadoop?

  
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Q23:   

Can multiple users write a file/files to the same directory in HDFS without having any disturbance to write operations?

  
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Q24:   

How does Hadoop Distributed Cache work?

  
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Q25:   

Why do we use HDFS for files with large data sets but not when there are a lot of small files?

  
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Q26:   

What happens if the NameNode fails in Hadoop?

  
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Q27:   

How HDFS achieves Fault Tolerance?

  
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Q28:   

What is the purpose of Shuffling and Sorting Phase in the reducer in Hadoop MapReduce?

  
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Q29:   

What is the ideal number of nodes in a Hadoop Cluster?

  
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Q30:   

What are some common reasons why parallel Hadoop jobs fail?

  
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Q31:   

What are some best practices for optimizing Hadoop job performance?

  
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Q32:   

Can Hadoop tasks run in Parallel on a single node?

  
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