what is block size in hadoop

 
 

Share on Google+Share on Google+

Java Coder
what is block size in hadoop
1 Answer(s)      18 days ago
Posted in : Big Data
Ads

Hi,

How Hadoop stores files and what is block size in hadoop?

Thanks

Ads
View Answers

November 26, 2017 at 7:33 PM


Hi,

When file is sent to Hadoop for storage the Hadoop system breaks the files into a set of individual blocks. These blocks are storage in different data nodes in the cluster and it makes multiple copies of each blocks depending on the replication factor.

In Hadoop 2.x typical block size is 128MB which is configurable. It can be configured as system default or for a individual file. In previous version of Hadoop, Hadoop 1.x it was 64MB.

Hadoop is distributed system which is designed to provide high throughput to achieve parallel processing of file fast. In Hadoop block size was increased with following reasons:

  • It was done to improve the NameNode performance

  • It also helped to improve the performance of MapReduce job because number of the mapper depends on the Block size.

  • To mange a Hadoop cluster with 1 petabytes and block size is 64 MB was difficult where count of block size was 15+million. And such size was difficult to manage. So, Block size was increased from 64MB to 128MB to ease the handling of large Hadoop clusters.

Check more tutorials at Big Data tutorials.

Thanks


Ads









Related Tutorials/Questions & Answers:
what is block size in hadoop
what is block size in hadoop  Hi, How Hadoop stores files and what is block size in hadoop? Thanks   Hi, When file is sent to Hadoop... throughput to achieve parallel processing of file fast. In Hadoop block size
What skills are required to be a Hadoop developer?
What skills are required to be a Hadoop developer?  Hi, How to become a good Hadoop Developer? What skills are required to be a Hadoop developer? Thanks
Advertisements
What are job role of Hadoop Developer?
What are job role of Hadoop Developer?  Hi, I am planning to get the the job in Hadoop Development as Hadoop Developer. What are the roles of a Hadoop Developer? Thanks
what is the size of java class
what is the size of java class  Could anyone tell me how to find the size of the class given below. public class Sample { private int x; private int y; private char ch; public static void main(String[] args) { Sample
What is Kafka max message size
What is Kafka max message size  Hi, What is Kafka max message size? Thanks   Hi, It is defined in Kafka with the variable: message.max.bytes Its value is: message.max.bytes (default:1000000) ? This is the max size
what is the default buffer size for bufferedreader
what is the default buffer size for bufferedreader  Hi, I am writing a program in Java for reading the big text file. I want to know what is the default buffer size for bufferedreader? Is there any example of reading the big
What are the restriction imposed on a static method or a static block of code?
What are the restriction imposed on a static method or a static block of code?  hi, What are the restriction imposed on a static method or a static block of code? Thanks
What?s the maximum size of a row in SQL table?
What?s the maximum size of a row in SQL table?  What?s the maximum size of a row in SQL table?   Hi, The maximum Row Size is 8060 Bytes in a sql table. Thanks
Statement block
Statement block  What is the purpose of a statement block
Hadoop Interview Questions and Answers
. Interview questions with answers of Hadoop What is Big Data? What is Hadoop? What are the main components of a Hadoop Application... is default? What is InputSplit in Hadoop? How is the splitting of file
JAVA what is different between static block and public static void main(String a[]) method
JAVA what is different between static block and public static void main(String a[]) method  what is different between static block and public static... block) why need of public static void main(String [])?   Static blocks
If elements are added at same bucket location in HashMap then what will be the size of HashMap?
then what will be the size of map...If elements are added at same bucket location in HashMap then what will be the size of HashMap?  I am trying to print the size of HashMap which
What is the maximum size of a file that can be uploaded using PHP and how can we change this?
What is the maximum size of a file that can be uploaded using PHP and how can we change this?  What is the maximum size of a file that can be uploaded using PHP and how can we change
Big Data tools - Hadoop - Why Hadoop as Big Data tool?
Big Data tools - Hadoop - Why Hadoop as Big Data tool?  Hi, How we can say that Hadoop is a Big Data Tool? What are the benefits of Hadoop in Big Data Environment? Thanks
Hadoop mapreduce
Hadoop mapreduce  How to read the Docx file using mapreduce method in hadoop
finally block
finally block  hii, If I am writing return at the end of the try block and some code in finally block, then the finally block will execute??   hello, certainly finally block will execute
Big data hadoop tutorial for beginners
learning Big Data and Hadoop from following tutorials: Big Data tutorials What... shell commands History of Hadoop What is machine learning? Hadoop and Big Data...Big data hadoop tutorial for beginners  Hi, Which is best Big data
How to upload and download file in hadoop?
for learning the process. How to upload and download file in hadoop? What are the commands for uploading file to Hadoop? What is the command for downloading file from...How to upload and download file in hadoop?  Hi, I am trying to learn
Size of commarea
Size of commarea  hii, What is the size of commarea?   hello, Default size of commarea is 65k
What are the prerequisites to learn Big Data and Hadoop?
Big Data and Hadoop - Complete information about the prerequisites to learn Big Data and Hadoop In this guide we will tell you the necessary prerequisites for learning the Big Data and Hadoop technologies. You will be able to select
Best Hadoop Training
to learn Big Data. What are Best Hadoop Training? Thanks   Hi, Hadoop... Big Data and Hadoop: Big Data tutorials What is Big Data? Best way to learn... of Hadoop What is machine learning? Hadoop and Big Data Tutorials Thanks
Java Function for block inside a block
Java Function for block inside a block  Write a function in Java that attempts to place a set of squares of varying widths into another, larger square. If there is no possible layout, return undefined. Otherwise, return
Java Function for block inside a block
Java Function for block inside a block  Write a function in Java that attempts to place a set of squares of varying widths into another, larger square. If there is no possible layout, return undefined. Otherwise, return
Hadoop Data Analytics - Hadoop as a Big Data Analytics Platform
Hadoop Data Analytics - Hadoop as a Big Data Analytics Platform  Hi, How Hadoop can be used a Big Data Analytics platform? What are the tools available for Big Data Analytics which can be used with Hadoop? Thanks   
Size in FLex
Size in FLex  Hi..... What is the difference between width, explicitWidth, measuredMinWidth, measuredWidth, and percentWidth? please tell me about that difference Thanks
Hadoop for Big Data
Hadoop for Big Data  Hi, How Hadoop is important in Big Data? Why developers are learning Hadoop first and other technologies after that? Thanks
Servletoutputstream size limit.
Servletoutputstream size limit.  What is the maximum size of ServletOutputStream
Hadoop Mapreduce Java
Hadoop Mapreduce Java   Do you Guys have/provide Hadoop Mapreduce java examples
Best Hadoop Tutorial
Best Hadoop Tutorial  Hi, Which is best Best Hadoop Tutorial? Thanks
Best Hadoop Tutorial
Best Hadoop Tutorial  Hi, Which is best Best Hadoop Tutorial? Thanks
Size in FLex
Size in FLex  Hi... I just want to know about... What happens in measure()? measuredHeight, measuredWidth, measuredMinHeight, measuredMinWidth are set. please give me an example with description... Thanks

Ads

 
Advertisement null

Ads