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Topic :: Apache Hadoop





Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Think that I am using tableau desktop & have a live connection to cloudera hadoop data. I need to press f5 to refresh the visualization. Is there anyway to automatically refresh visualization every ‘x’ seconds instead of pressing f5?

653

How can apache spark be used alongside hadoop?

1821

What is a namenode in hadoop?

59

Define hadoop archives?

39

Suppose there is file of size 514 mb stored in hdfs (hadoop 2.x) using default block size configuration and default replication factor. Then, how many blocks will be created in total and what will be the size of each block?

131

What is a rack awareness algorithm and why is it used in hadoop?

46

Define hadoop archives? What is the command for archiving a group of files in hdfs.

54

Why rack awareness algorithm is used in hadoop?

53

What are the advantages of using mapreduce with hadoop?

643

What is the role of recordreader in hadoop mapreduce?

795

What are the benefits yarn brings in to hadoop?

471

Define “speculative execution” in hadoop?

482

How can we create a hadoop cluster from scratch?

469

What is the job tracker role in hadoop?

486

Define a sequence file in hadoop?

586




Un-Answered Questions { Apache Hadoop }

What is Apache Hadoop YARN?

1499


What are the modules that constitute the Apache Hadoop 2.0 framework?

1048


What is Apache Hadoop? Why is Hadoop essential for every Big Data application?

969


What are the core components of Apache Hadoop?

829


What is the difference between Apache Hadoop and RDBMS?

856


How is security achieved in Apache Hadoop?

965


What is Apache Hadoop?

900


What is a “Distributed Cache” in Apache Hadoop?

824


What is the problem with small files in Apache Hadoop?

839


What is Rack Awareness in Apache Hadoop?

859


Explain Erasure Coding in Apache Hadoop?

803


What is Disk Balancer in Apache Hadoop?

953


What is a speculative execution in Apache Hadoop MapReduce?

834


What are the modes in which Apache Hadoop run?

840


What is Safemode in Apache Hadoop?

781