-
I started by creating a mapper.py file like this, In the mapper i am reading one line from input at a time and then splitting it into pieces and writing it to output in
(word,1)
format. In the mapper whatever i write in output gets passed back to Hadoop, so i could not use standard output for writing debug statements. So i configured file logger that generates debug.log in the current directoryThis file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters#!/usr/bin/env python import sys import logging logging.basicConfig(filename='debug.log',level=logging.DEBUG) logging.debug("Entering mapper.py") for line in sys.stdin: logging.debug("Inside for loop " + line) line = line.strip() for word in line.split(" "): if( len(word) >0 ): print ("%s\t%i" %(word.lower(),1)) -
Next i created a reducer.py program that reads one line at a time and splits it on tab character. In the split first part is word and second is the count. Now one difference between java reducer and streaming reducer is in Java your reduce method gets input like this
(key, [value1, value2,value3]),(key1, [value1, value2,value3])
. In streaming it gets called with one key and value every time like this(key,value1),(key,value2),(key,value3),(key1,value),(key1,value2),(key1,value3)
, so you will have to remember what key your processing and handle the change in key. In my reducer i am keeping track of current key, and for every value of the current key i keep accumulating it, when the key changes i use that opportunity to dump the old key and countThis file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters#!/usr/bin/env python import sys import logging logging.basicConfig(filename='debug.log',level=logging.DEBUG) current_word = None current_count= 0 word = None print "Entering reducer.py" for line in sys.stdin: line = line.strip() parts = line.split('\t', 1) if( len(parts) < 2): continue; word = parts[0] count = parts[1] try: count = int(count) except ValueError: continue if current_word == word: current_count = current_count + count else: if(current_word): print("%s\t%s" %(current_word,current_count)) current_count = count current_word = word if current_word == word: print("%s\t%s" %(current_word, current_count)) -
One good part with developing using scripting is that you can test your code without hadoop as well. In this case once my mapper and reducer are ready i can test it on command line using
data | mapper | sort | reducer
format. In my case the mapper and reducer files are in /home/user/workspace/HadoopPython/streaming/ directory. and i have a sample file in home directory so i could test my program by executing it like thiscat ~/sample.txt | /home/user/workspace/HadoopPython/streaming/mapper.py | sort | /home/user/workspace/HadoopPython/streaming/reducer.py
-
After working through bugs i copied aesop.txt in in root of my HDFS and then i could use following command to execute my map reduce program.
hadoop jar /usr/local/hadoop/share/hadoop/tools/lib/hadoop-streaming-2.4.0.jar -input aesop.txt -output output/wordcount -mapper /home/user/workspace/HadoopPython/streaming/mapper.py -reducer /home/user/workspace/HadoopPython/streaming/reducer.py
-
Once the program is done executing i could see the output generated by it using following command
hdfs dfs -cat output/wordcount/part-00000
WordCount MapReduce program using Hadoop streaming and python
I wanted to learn how to use Hadoop Streaming, which allows us to use scripting language such as Python, Ruby,.. etc for developing Map Reduce program. The idea is instead of writing Java classes for Mapper and Reducer you develop 2 script files (something that can be executed from command line) one for mapper and other for reducer and pass it to Hadoop. Hadoop will communicate to the script files using standard input/output, which means for both mapper and reducer hadoop will pass input on standard input and your script file will read it from standard input. Once your script is done processing the data in either mapper or reducer it will write output to standard output that will get sent back to hadoop.
I decided to create Word Count program that takes a file as input and counts occurrence of every word in the file and writes it in output. I followed these steps
Subscribe to:
Post Comments (Atom)
148 comments:
I am reading your post from the beginning, it was so interesting to read & I feel thanks to you for posting such a good blog, keep updates regularly.
Regards,
Python Training in Chennai|Informatica training in chennai|Python Training Institutes in Chennai
Thanks for sharing this niche useful informative post to our knowledge, Actually SAP is ERP software that can be used in many companies for their day to day business activities it has great scope in future.
Regards,
SAP training|SAP institutes in chennai|SAP Institutes in Chennai|sap training institute in Chennai
I have a hard time describing my on content, but I really felt I should here. Your article is really great. I like the way you wrote this information.
character count tool
Thanks for sharing this information .You may also refer http://www.s4techno.com/hadoop-training-in-pune/
I think this map reduce program is easily implementable and neat code. Thanks man. CPDESK is Online Web Development Tool Company located in Canada. Our main services include : Web based Software designing Tool, Web based Business Application, Web based SQL form designer, Corporate application form designer. For more details please visit our site - Web Development Tools For Business Application | CPDESK
The young boys ended up stimulated to read through them and now
have unquestionably been having fun with these things.
Selenium Training in Chennai
I enjoy what you guys are usually up too. This sort of clever work and coverage! Keep up the wonderful works guys I’ve added you guys to my blog roll.
Java Training in Bangalore|
Hello there! This is my first comment here, so I just wanted to give a quick shout out and say I genuinely enjoy reading your articles. Can you recommend any other blogs/websites/forums that deal with the same subjects? Thanks. DevOps Training in Bangalore
My Besant Technologies offer AWS training with 100% placement. Our AWS training course that includes fundamentals and advance AWS training program with high priority jobs. AWS training with placement having more exposure in most of the industry nowadays in depth manner of AWS.
AWS Training in Bangalore
Very Nice blog: WordCount MapReduce program using Hadoop streaming and python
python, hadoop and mapreduce in same blog.
thank you for sharing the precious knowledge with us
keep blogging more Mr. Sunil I hav red ur other blog also on python.
very useful.
Devops Training in Bangalore
Thanks a lot for explaining practically. Fantastic Post! IOS Training in Chennai. Get more information IOS Training
I’ve bookmarked your site, and I’m adding your RSS feeds to my Google account.
Besant technologies Marathahalli
very helpfull blog it was a pleasure reading your blog
would love to read it more
knowldege is not found but earned through hardwork and good teaching
that being said click here to join us the next best thing in bangalore
devops online training
Devops Training in Bangalore
Good
python training in bangalore
pytjhon online training
Thanks for sharing that valuable post. I really enjoy your post. I will be waiting for your another blog & i want more Inventory Audit |Fixed Assets Audit | Internal Audit
Nice blog thanks for sharing and keep updating
devops training in bangalore
python training in bangalore
aws training in bangalore
Thanks for helping me to understand basic Hadoop Streaming of api using python concepts. As a beginner in Hadoop your post help me a lot.
Hadoop Training in Velachery | Hadoop Training .
Hadoop Training in Chennai | Hadoop .
That is extremely fascinating; you are an exceptionally talented blogger.Thanks for sharing.Keep it up. Daily Transaction Verification
Duplicate Payment Review
AP Vendor Helpdesk
Existing without the answers to the difficulties you’ve sorted out through this guide is a critical case, as well as the kind which could have badly affected my entire career if I had not discovered your website. Best AWS Training in Bangalore
It has been simply incredibly generous with you to provide openly what exactly many individuals would’ve marketed for an eBook to end up making some cash for their end, primarily given that you could have tried it in the event you wanted.
AWS Training in Bangalore
Python Training in Bangalore
Nice post.Thank you so much for sharing.Yiioverflow is a web development company.We have well expert team in Angular JS, Ionic, Yii Framework, Node JS, Laravel, PHP, MySQL, and WordPress.If you want a developer visit.. https://yiioverflow.com/
very informative blog and useful article thank you for sharing with us, keep posting Big data hadoop online Course India
Thanks for providing good information,Thanks for your sharing python Online Course
So informative and useful blog for computer science students. Its very decent article, keep sharing more post like this one. Thanks
Big Data Testing Classes
Hadoop Big Data Classes in Pune
Thankyou for providing the information, I am looking forward for more number of updates from you thank you Best Machine learning training in chennai
machine learning with python course in Chennai
machine learning course in chennai
Your blog information are really creative and useful for the readers.I ever read such kind of nice article yet.hope you will add more innovative ideas on your post.
Android Training in Karapakkam
Android Training in Vadapalani
Android Training in Mogappair
mobile application development course in bangalore
Nice Blog
iot courses in Bangalore
internet of things training course in Bangalore
internet of things course in Bangalore
Nice blog.. keep on sharing
tableau course in bangalore
best tableau training in bangalore
tableau training in bangalore
tableau certification in bangalore
tableau training institutes in bangalore
Very beautiful Nice blog.
best android training center in Marathahalli
best android development institute in Marathahalli
android training institutes in Marathahalli
ios training in Marathahalli
android training in Marathahalli
mobile app development training in Marathahalli
This blog is more effective and it is very much useful for me.
we need more information please keep update more.
Selenium Training in Kelambakkam
Selenium Training in Vadapalani
selenium training in bangalore
selenium training institutes in bangalore
I am really enjoying reading your well-written articles. It looks like you spend a lot of effort and time on your blog. I have bookmarked it and I am looking forward to reading new articles. Keep up the good work.
RPA courses in Chennai
RPA Training Institute in Chennai
Robotic Process Automation training in bangalore
Robotics courses in bangalore
RPA Training in Chennai
Your blog is so inspiring for the young generations.thanks for sharing your information with us and please update more new ideas.
Best devops Training Institute in Anna nagar
devops Certification Training in Anna nagar
devops certification in bangalore
devops training institutes in bangalore
Very Nice Article keep it up...! Thanks for sharing this amazing information with us...! keep sharing
Such a wonderful blog on Machine learning . Your blog almost full information about Machine learning .Your content covered full topics of Machine learning that it cover from basic to higher level content of Machine learning . Requesting you to please keep updating the data about Machine learning in upcoming time if there is some addition.
Thanks and Regards,
Machine learning tuition in chennai
Machine learning workshops in chennai
Machine learning training with certification in chennai
Thanks For Sharing Your Information Please Keep UpDating Us Time Just Went On Reading The article The Information shared Is Very Helpful
Datascience Online Training Aws Online Training Python Online Training Devops Online Training
Thanks For Sharing The Information The Information shared Is Very Valuable Please Keep Updating Us Time Just Went On reading The Article Aws Online Course Python Online Course Data Online Course Hadoop Online Course
Thank you for allowing me to read it, welcome to the next in a recent article. And thanks for sharing the nice article, keep posting or updating news article.
oppo service centre
oppo mobile service center in chennai
oppo mobile service center
I like your blog, I read this blog please update more content on hacking, nice post
Data Science training in bangalore
Attend The Python training in bangalore From ExcelR. Practical Python training in bangalore Sessions With Assured Placement Support From Experienced Faculty. ExcelR Offers The Python training in bangalore.
python training in bangalore
Nice information, valuable and excellent design, as share good stuff with good ideas and concepts, lots of great information and inspiration, both of which I need, thanks to offer such a helpful information here.
machine learning course in bangalore
bon mat xa
máy ngâm chân giải độc
bồn matxa chân
bồn mát xa chân
bồn massage chân
Маълумоте, ки шумо мубодила мекунед, низ хуб ва шавқовар аст. Ман ин мақоларо хонда будам
cửa lưới chống muỗi
lưới chống chuột
cửa lưới dạng xếp
cửa lưới tự cuốn
Hey, Great article! I liked the way you write, Check my articles . You may like itInterior Renovation Ideas on your Budget: 5 MINIMALIST INTERIOR DESIGN IDEAS 11 Ultimate tips for Kitchen Interior DesigningUseful ideas for Apartment home Interior designs:
Data for a Data Scientist is what Oxygen is to Human Beings. business analytics course with placement this is also a profession where statistical adroit works on data – incepting from Data Collection to Data Cleansing to Data Mining to Statistical Analysis and right through Forecasting, Predictive Modeling and finally Data Optimization.
Baby Boy Summer Outfits in 2019
Pattern Type: Cartoon
Dresses Length: Above Knee, Mini
Material Composition: Cotton
Silhouette: A-Line
Collar: Circular collar
Sleeve Length(cm): Short
Sleeve Style: REGULAR
Style: Cute
Material: COTTON
Actual Images: yes
Decoration: Flowers
please visit
Nice blog thanks for sharing and keep updating...
python training in bangalore - eCare Technologies located in Marathahalli - Bangalore, is one of the best Python Training institute with 100% Placement support. Python Training in Bangalore provided by Python
Certified Experts and real-time Working Professionals with handful years of experience in real time Python Projects.
http://www.ecaretechnologies.info/Python-Training-Institutes-in-Bangalore.html
Thanks for Sharing such an useful info...
aws training
This post is very simple to read and appreciate without leaving any details out. Great work!
Please check ExcelR Data Science Courses
I just got to this amazing site not long ago. I was actually captured with the piece of resources you have got here. Big thumbs up for making such wonderful blog page!
data analytics course in mumbai
I am reading your post from the beginning, it was so interesting to read & I feel thanks to you for posting such a good blog, keep updates regularly... Salesforce Training Online
I like viewing web sites which comprehend the price of delivering the excellent useful resource free of charge. I truly adored reading your posting. Thank you!! data science courses in Bangalore
Study Machine Learning Course Bangalore with ExcelR where you get a great experience and better knowledge .
Machine Learning Course Bangalore
Study Data Analytics Course in Bangalore with ExcelR where you get a great experience and better knowledge .
Machine Learning Course Bangalore
Cool stuff you have and you keep overhaul every one of us.
machine learning course in pune
It’s good to check this kind of website. I think I would so much from you. ExcelR Machine Learning Courses
Thanks for the codes and Appreciate it. shall try to implement it.
data science institute in indore
cool stuff you have and you keep overhaul every one of us
"Simple Linear Regression
Correlation vs Covariance
"
I have been checking out a few of your stories and i can state pretty good stuff. I will definitely bookmark your blog this
I am reading your post from the beginning, it was so interesting to read & I feel thanks to you for posting such a good blog, keep updates regularly.
Web Designing Training Course in Chennai | Certification | Online Training Course | Web Designing Training Course in Bangalore | Certification | Online Training Course | Web Designing Training Course in Hyderabad | Certification | Online Training Course | Web Designing Training Course in Coimbatore | Certification | Online Training Course | Web Designing Training Course in Online | Certification | Online Training Course
I appreciate everything you have added to my knowledge base.Admiring the time and effort you put into your blog and detailed information you offer.Thanks. this
I am a regular follower of your blog. Really very informative post you shared here. Kindly keep blogging.
thank you
Python Training in Chennai
Python Training in Training
Python Training in Bangalore
Python Hyderabad
Python Training in Coimbatore
Many thanks for providing this information.
Data Science Training in Noida
Data Science Training institute in Noida
If you are interested in live streaming channels, then create a personal account for using a Roku device at its best.Reading Roku blog at platform can enlighten you in many aspects and you can use your Roku com link. And enjoy Live streaming on television.
Great Post, Thanks for sharing such a informative information.
Python Online Training
Python Online Training in Chennai
Python Online Course in Chennai
I am really enjoying reading your well written articles. It looks like you spend a lot of effort and time on your blog. I have bookmarked it and I am looking forward to reading new articles. Keep up the good work.
online course
Very interesting to read this article.I would like to thank you for the efforts you had made for writing this awesome article. This article inspired me to read more. keep it up.data science courses
Very Great article,this blog looks too good.
thank you for sharing with us.keep updating...
big data hadoop course
hadoop administration online training
This was definitely one of my favorite blogs. Every post published did impress me. ExcelR Data Analytics Courses In Pune
The information that you have shared is really useful for everyone.
Data Science Online Training
python Online Training
I have express a few of the articles on your website now, and I really like your style of blogging. I added it to my favorite’s blog site list and will be checking back soon…
Machine Learning Courses A debt of gratitude is in order for sharing the information, keep doing awesome... I truly delighted in investigating your site. great asset...
I have express a few of the articles on your website now, and I really like your style of blogging. I added it to my favorite’s blog site list and will be checking back soon…
Machine Learning Courses in Pune Personally I think overjoyed I discovered the blogs.
Good job in presenting the correct content with the clear explanation. The content looks real with valid information. Good Work
DevOps is currently a popular model currently organizations all over the world moving towards to it. Your post gave a clear idea about knowing the DevOps model and its importance.
Good to learn about DevOps at this time.
DevOps Training in Chennai
DevOps Course in Chennai
your blog' s design is simple and clean and i like it. Your blog posts about Online writing Help are superb. Please keep them coming. Greets!
Best Tableau Training Institute in Pune
Register now to participate in the intensive AAI Training in Hyderabad program taught by experts at the AI Patasala training center.
A wide network of supported hardware has FuboTV’s back. It is available on most of the android and iOS stores. Apart from this it also has apps for over-the-top boxes and sticks. These include Amazon Fire TV, Android TV, Apple TV. Samsung Smart TVs are available in the beta version. fubo.tv/Connect
Join the Python Course in Hyderabad and participate in free workshops with AI Patasala. Candidates can pursue their dreams and reach the highest level in the field.
Python Institutes in Hyderabad
Python Training at Hyderabad from AI Patasala would be ideal for students who want to develop their technical abilities in Python.
Python Course with Placements in Hyderabad
Take advantage of The AI Patasala career-oriented training in Python Training in Hyderabad and build your expertise regarding Python.
Python Certificate in Hyderabad
Extremely overall quite fascinating post. I was searching for this sort of data and delighted in perusing this one. Continue posting.
A debt of gratitude is in order for sharing.business analytics course in kolhapur
Useful post Thanks for sharing it that’s truly valuable knowledge about similar topic. Amazing. Have a more successful day. Amazing write-up always finds something interesting. digital marketing services in delhi
Software Courses from Infycle Technologies, get DevOps Training in Chennai the best software training Institute in Chennai. And we also come up with other technical courses like Cyber Security, Graphic Design and Animation, Block Security, Java, Cyber Security, Oracle, Python, Big data, Azure, Python, Manual and Automation Testing, DevOps, Medical Coding etc., and we also provide excellent technical trainers with best training 100+ Live Practical Sessions with Real-Time scenarios at the end of the course the freshers, experienced, and Tech professionals will be able to obtain more knowledge of the course and be able to get through the interviews on top MNC’s with an amazing package. For more details approach us on 7504633633, 7502633633.
I wish more writers of this sort of substance would take the time you did to explore and compose so well. I am exceptionally awed with your vision and knowledge.
data science training in lucknow
Learn to build powerful models to solve business problems by generating useful insights and discover the various scientific processes and methods used to transform the information available in huge datasets into meaningful results. master all the tools and techniques in Data Science and gain domain-specific knowledge which will help you to add more value to your profile. Sign up for the Data Science course in Bangalore with Placements and multiple your chances of working across all industries and job functions.
Data Science Course in Jaipur
Logistic regression is used to predict a data value based on previous observations of a data set. It is a vital tool in the ML. It allows an algorithm to be used in an ML application to classify new data based on historical data. It gets better at classification with new data incoming. Logistic regression plays an active role in data preparation activities.
Business Analytics Course in Jodhpur
360DigiTMG offers the best Data Analytics courses in the market with placement assistance. Enroll today and fast forward your career.
Data Science Course in Delhi
Fast forward your career with the best Data Analyst Course offered by 360DigiTMG. Get trained by expert trainers with placement assistance.
Data Scientist Course in Delhi
I can say this has been one of the most interesting blog posts I have ever read on this topic. I have added a bookmark to this post, so that I can refer to it whenever I have any queries on this subject. Thanks for providing us with many inputs from many angles on this subject.
power bi course malaysia
So Nice article https://earningmoneyonlinefirst7.blogspot.com/
Thank you for the detailed walkthrough of creating a WordCount MapReduce program using Hadoop Streaming and Python. It's incredibly informative for those new to this process. Great job!
Data Analytics Courses in Nashik
This article likely guides readers through the creation of a WordCount MapReduce program using Hadoop streaming and Python, a valuable resource for those learning about distributed computing and data processing.
Data Analytics Courses In Kochi
Hi,
This post provides an excellent introduction to using Hadoop Streaming with Python for MapReduce programs. The step-by-step explanation, along with the code snippets, is incredibly helpful for beginners. It's a great resource for learning and testing MapReduce jobs.
Is iim skills fake?
That is incredibly fascinating, and you are a very gifted blogger. I appreciate you sharing. Keep going.
Data Analytics Courses in Agra
This blog post is likely a helpful guide for implementing a WordCount MapReduce program using Hadoop streaming and Python. WordCount is a fundamental example in the world of MapReduce and big data processing. The post is likely to provide step-by-step instructions and code examples, making it a valuable resource for developers and data engineers looking to learn how to work with Hadoop streaming and Python for data processing tasks. A must-read for those aiming to dive into the world of distributed computing and Hadoop.
Data Analytics Courses in Delhi
This post brilliantly explains how to use Hadoop Streaming with Python for a Word Count program. The step-by-step guide, coupled with the clear code snippets, makes it an excellent resource for those learning Hadoop and MapReduce. Thank you for the detailed explanation.
Data Analytics Courses In Dubai
This program efficiently counts the occurrences of each word in a given dataset by breaking it down into key-value pairs, mapping the words, and then reducing them to get the final count.
Well wrritten article.
Data Analytics Courses In Chennai
A WordCount MapReduce program using Hadoop streaming and Python is a powerful approach for processing and analyzing large text datasets efficiently, making it a crucial tool in big data analytics. In the context of data analytics, Glasgow offers Data Analytics courses that cover a wide range of data processing techniques, including Hadoop and MapReduce, preparing professionals for the ever-expanding world of data analysis. Please also read Data Analytics courses in Glasgow .
"I'm impressed by the clarity and efficiency of this WordCount MapReduce program implemented using Hadoop streaming and Python.
Digital Marketing Courses in Hamburg
A very pleasant and intriguing article. I was in search of this type of content and found it enjoyable to read. Please continue to publish more. Appreciations for sharing.
daa Analytics courses in leeds
Great article! I appreciate you sharing this valuable information. Keep up the good work.
daa Analytics courses in leeds
Your demonstration of the WordCount MapReduce program using Hadoop streaming and Python is both informative and practical.
Digital marketing courses in woking
I found the blog incredibly informative the guide on WordCount program with Hadoop streaming and Python is well explained in the blog post .
Digital Marketing Courses in Italy
Creation of WordCount programme is really excellent thanks for sharing detailed and insightful blog post.
data analyst courses in limerick
such an informative blog about the topic WordCount MapReduce program using Hadoop streaming and python, thanks for sharing.
Digital Marketing Courses In port-harcourt
Thank you for providing detailed information on WordCount MapReduce program using Hadoop streaming and python.
Digital Marketing Courses In Bhutan
such an informative blog about the topic WordCount MapReduce program using Hadoop streaming and python, thanks for sharing.
Digital marketing business
In a world where big data processing is becoming increasingly prevalent, your blog post serves as a valuable resource for those seeking hands-on experience with Hadoop streaming and Python. Thank you for sharing your expertise, and I look forward to exploring more of your insights on distributed computing. Digital marketing for business
Hello blogger, it is great read entirely defined, well structured and delivered , continue the good work constantly. Digital marketing roles responsibilities salaries
Thankyou for sharing in depth knowledge and excellent tutorial on WordCount MapReduce program using Hadoop streaming and python.
Adwords marketing
I came across your blog and wanted to tell you that I really enjoyed reading your articles.
Investment banking courses in Hyderabad
Your detailed guide on implementing a WordCount program using Hadoop Streaming and Python is incredibly helpful. Thank you for sharing your expertise.
How Digital marketing is changing business
Thank you for sharing fantastic tutorial and insights on WordCount MapReduce program using Hadoop streaming and python.
Adwords marketing
The blog post provides great and insightful tutorial on WordCount MapReduce program using Hadoop streaming and python.
Investment banking training Programs
Some extremely useful code in this blog post. Thanks for the share.
Investment banking analyst jobs
It always works in your Favour when you have this kind of blog in your list. I am grateful.
Investment banking courses in the world
Fantastic tutorial on implementing the Wordcount program using Hadoop streaming and Python. The step-by-step breakdown makes it easy for beginners and experienced developers to follow the process. Thanks for sharing this valuable resource for Hadoop enthusiasts.
Digital marketing courses in city of Westminster
"Your blog on the WordCount MapReduce program using Hadoop streaming and Python is a coding compass for developers venturing into the world of big data. The detailed step-by-step guide not only demystifies the MapReduce process but also empowers readers to harness the power of Hadoop with Python. Thanks for providing a clear roadmap in big data processing, making the intricacies of WordCount accessible for both beginners and seasoned developers."
Investment banking as a career in India
Really a good information. Please keep on updating about latest innovations in the field of Big Data.
Investment banking courses after 12th
Thank you for sharing insightful and valuable post.
Investment banking courses in Australia
Nice blog post. Thanks for sharing such worth reading blog with us.
Learn Python Course in Pune
thanks for sharing post.
provident east lalbagh
adarsh welkin park
You can now list your property through the holiday rentals management companies and earn monetary perks. All you have to do is explore all the property management companies and pick the one with an excellent market reputation.
Great work! Nice article
UI UX Design School
For the best results, you should go with the best and most reputed Digital Marketing Training Bangladesh - SEO Bangladesh. The services that you'll be offered from the particular company is very beneficial and required by your business if you are planning to take an initial step.If you are interested in learning digital marketing, here is a complete list of the best online digital marketing courses with certifications. In this article, you will learn about digital marketing and its different strategies, the need for doing digital marketing, the scope of digital marketing
After a long tiring day, you can just sit in front of the Coconut Oil and place an order as per your need. You can also do the same thing from your beloved Hair oil. No matter where you are,Online Shopping Bangladesh King Earth will send your product at your doorstep within a certain period of time.
1. Mapper Script (mapper.py):
This script reads lines of text from standard input (STDIN) and emits each word as a key-value pair. Here's an example:
Python
#!/usr/bin/env python
import sys
for line in sys.stdin:
# Clean and split line into words
words = line.strip().lower().split()
# Emit each word with a count of 1
for word in words:
print(f"{word}\t1")
Use code with caution.
Explanation:
#!/usr/bin/env python specifies the interpreter for running the script.
import sys provides access to system features like standard input.
The loop iterates over each line read from STDIN.
Text cleaning:
strip() removes leading and trailing whitespace.
lower() converts all characters to lowercase.
split() splits the line into individual words.
We iterate over each word and print it as the key with a value of 1 (representing its initial count).
The tab (\t) separates the key and value.
2. Reducer Script (reducer.py):
Big Data Projects For Final Year Students
Image Processing Projects For Final Year
This script receives key-value pairs (word and its count) from the mapper and sums the counts for each unique word. Here's an example:
Python
#!/usr/bin/env python
from collections import defaultdict
import sys
# Use a dictionary to store word counts
word_counts = defaultdict(int)
# Read key-value pairs from standard input
for line in sys.stdin:
word, count = line.strip().split('\t', 1)
# Convert count to integer
word_counts[word] += int(count)
# Emit final word counts
for word, count in word_counts.items():
print(f"{word}\t{count}")
Use code with caution.
Explanation:
Similar shebang line for specifying the interpreter.
from collections import defaultdict imports a dictionary that sets default values to 0 when keys are not found.
An empty dictionary word_counts is created.
The loop reads key-value pairs from STDIN.
split('\t', 1) splits the line by the first tab, assigning the first element to word and the second to count (with a maximum of 1 split).
The count is converted from string to integer.
word_counts[word] += int(count) increments the count for the specific word in the dictionary.
Finally, we iterate through the dictionary and print the final word counts.
Deep Learning Projects for Final Year
A Word Count MapReduce program using Hadoop Streaming with Python involves writing two scripts: a mapper to split text into words and emit word counts, and a reducer to aggregate these counts. Hadoop Streaming facilitates Python integration into the Hadoop framework.
Data science courses in Gurgaon
This post on content marketing strategies is so useful! Your focus on providing value rather than just promotion really resonates. Thank you for the guidance!
Data science courses in Gujarat
This is an excellent guide on using Hadoop Streaming with Python for MapReduce! I appreciate how you broke down the process into clear steps, making it easy to follow along. The example of the Word Count program is a fantastic way to illustrate the concept. Thank you for sharing your insights! Data Science Courses In Malviya Nagar
"Great explanation of the WordCount MapReduce program! Your breakdown of the code makes it much easier to understand how MapReduce works.
Data science courses in Bhutan
NIce blog. Keep on sharing more such helpful articles.
Data Science Courses in Hauz Khas
This article on implementing a WordCount program using MapReduce is an excellent resource for anyone looking to understand the basics of Hadoop and distributed computing. The step-by-step breakdown makes it easy to follow, and the provided code snippets are particularly helpful for beginners. Great job simplifying a complex topic!
data analytics courses in dubai
This article provides a clear and practical guide to implementing a Word Count program using Hadoop Streaming with Python. It effectively outlines the step-by-step process of creating both the mapper and reducer scripts, which is especially helpful for those transitioning from Java-based Hadoop development to using scripting languages.
The use of logging for debugging is a smart approach, as it helps track the execution flow without interfering with the output format expected by Hadoop. Additionally, the explanation of how the streaming reducer works differently from the Java reducer is insightful and highlights the importance of managing state across key changes.
The ability to test the scripts locally before deploying them to Hadoop is a valuable tip, allowing for quick iteration and debugging. The command-line examples provided for testing and running the MapReduce job in Hadoop offer practical guidance that readers can easily follow.
Overall, this article serves as an excellent resource for anyone looking to harness the power of Hadoop Streaming with Python. It demystifies the process and empowers users to implement their own MapReduce jobs effectively. Great job!
Data science courses in Mysore
That is extremely fascinating; you are an exceptionally talented blogger.Thanks for sharing.Keep it up.
Data science Courses in Manchester
Thank you for sharing such valuable knowledge! I found your tips practical and applicable to my own life. I’m eager to implement what I’ve learned.
Data science courses in Mumbai
Thank you for this informative article on using Hadoop Streaming with Python for a Word Count MapReduce program. Your clear explanation of how to create and execute mapper and reducer scripts is incredibly helpful for those new to this approach. I appreciate the effort you've put into sharing this knowledge!
Data science Courses in Reading
The WordCount program using Hadoop Streaming and Python is a foundational MapReduce. By splitting the input data into lines and counting occurrences of each word, it efficiently handles large datasets. Hadoop Streaming enables using Python scripts for mapping and reducing, making it accessible for non-Java users. The mapper outputs words with counts, and the reducer aggregates these counts, producing the final word frequency. This program showcases the power of parallelism in big data processing.
Data science Courses in Germany
If you're thinking about pursuing a career in data science in Iraq, this post is a goldmine! The courses listed here can set you on the right path to success. Don’t hesitate—check out the available courses here and take the first step toward a rewarding career.
Such a well-written and insightful post! You really know your stuff, and I appreciate how you shared it in an easy-to-digest way
Data science courses in Bangalore
Fantastic post! The information shared is very insightful and helpful. I appreciate the clear explanations and practical tips. Looking forward to more articles like this!
Data science courses in Bangladesh
Exploring Hadoop Streaming with Python for a WordCount program is a great way to simplify MapReduce development! The blend of scripting ease with big data power is fascinating. 🚀
Data science course in Navi Mumbai
NILANJANA B
NBHUNIA8888@gmail.com
Data science course in Navi Mumbai
https://iimskills.com/data-science-courses-in-navi-mumbai/
Great post! The detailed explanation of WordCount MapReduce program using Hadoop streaming and python is really helpful, especially for python web developers. The step-by-step guidance makes the process clear and easy to understand. Thanks for sharing this valuable info. Investment Banking Course
In This article Iam really enjoying reading your well-written knowledge . It looks like you spend a lot of effort and time on your blog. good work!
IIM SKILLS Data Science Course Reviews
Very detailed explanation on the WordCount MapReduce using Hadoop. Concepts explained in a simple way ,very easy to follow. Thank you for the share.
technical writing course
Great guide on using Hadoop Streaming with Python for a Word Count program! It’s awesome to see how you broke down the process of creating the mapper and reducer scripts, and the use of logging to debug the script execution is a nice touch. digital marketing courses in delhi
Using Hadoop Streaming with Python for a WordCount program simplifies MapReduce development without diving into Java. Testing locally with cat | mapper | sort | reducer is a smart way to debug before deploying to HDFS!
Data science courses in Mumbai
Data science courses in Mumbai
Name: INTERN NEEL
Email ID: internneel@gmail.com
Post a Comment