Mapreduce wordcount program in hadoop(Compile & Run)

HELLO FRIENDS TODAY WE ARE GOING TO LEARN HOW TO COMPILE AND RUN MAPREDUCE WORDCOUNT PROGRAM (IN JAVA) IN HADOOP USING COMMAND LINE :-

WHAT IS WORDCOUNT PROGRAM?

WORDCOUNT IS A SIMPLE APPLICATION THAT DETERMINES HOW MANY TIMES DIFFERENT WORDS APPEAR IN A GIVEN INPUT SET.

GOALS FOR THIS SESSION:
1. UNDERSTAND THE MAPREDUCE PROGRAM FLOW.
2. UNDERSTAND HOW TO WRITE PROGRAMS FOR HADOOP MAPREDUCE.
3. UPLOAD THE INPUT DATA TEXT FILE IN HDFS.
4. CREATE YOUR OWN JAR.
5. RUN A JAR ON HADOOP ARCHITECTURE.
6. VIEW AND DOWNLOAD OUTPUT FILE.
7. VIEW OUTPUT ON COMMAND LINE.

Install Hadoop in ubuntu (Single node cluster)

[bishnuagrawal]

my first MR job in hadoop...thank u from bottom of my heart

[LijoJohnseekmoreexpectless]

Good Explanation of the .java file.
hope to see more interesting and informative video on mapreduce.

[mustaphaskittou]

Very useful and understandable method. thank you for the video..

[ismahenelarbi]

It would've been better if you spoke and explained why we were creating that folder etc... but your video is very helpful, thanks :)

[walidksiaa]

An excellent tutorial, really, it helped a lot :-)

I have a question:
Can the same process be done with any mapReduce Java program, with its appropriate data set ?

Regards

[rashmiri]

Great explanation!!! helped a lot.. thank you.. I have a question. I have problem where my name node is not running even after formatting? tried almost all the possible solution!! what could be the problem ?

[fernandocuichan]

where can I get The Word count program That use un The program.. thanks

[blackswan]

Hi, I have question to you. I have sentence for example: "I like
spaggetti and tomato soup" and I would like split it by two words: "I
like" "like spaggetti" "spaggetti and" "and tomato" "tomato soup". Could
you describe me how to do this? of course in my file i will have more
sentences -not only one.

[rfire]

Hi, Thanks for the tutorial, its great.
I tried to follow it, and got to the end, the problem is that the output seems to go through only the mapper
i.e. the output is something like this:
hello 1
world 1
world 1
...
The code i'm running is exactly the same as the one in the tutorial, any idea what might cause this? thanks.

[fatimezzahrarbib]

Hey! please help me i m having this error :"mkdir: `/user': Input/output error" while typing the command : "bin/hdfs dfs -mkdir /user"

[federicomontealegre]

Hi! Your video is excelent! But I got a problem... I got hadoop 2.7.2 and until I use bin/hadoop jar WordCount /user/inputdata/ outputwc it just doesn't do the map reduce it stays with the terminal blinking... Do you have any idea which is the problem?

[visharthigee]

I followed the exact instructions but when it came to compiling the program I received a lot of errors saying 'cannot find symbol' Mapper, etc. Please help

[iamjameswong]

Hi, there. I followed your great tutorial without a glitch until running the .jar file, and it threw me an error like this:

Exception in thread "main" WordCountpro
at
at
at
at Method)
at
at
at

Could you please help me figure it out what was going on here? Thanks in advance.

[walidksiaa]

Can i ask other questions:

What is the difference when implementing mapReduce in a multi-node cluster?

Is the multi node cluster used when the data set is too large?

[fernandocuichan]

hola amigos una pregunta donde puedo conseguir el programa word cound que se encuentra en el video

[venkatanikhilch]

I don't have "usr/local/hadoop" directory. Please help me.

[flowertje]

Hi, where do I need to put the wordcountf map?

[sadiqluck]

please if you can gave acces to java code it will be helpful