Hadoop HDFS Commands and MapReduce with Example: Step-by-Step Guide | Hadoop Tutorial | IvyProSchool
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- Опубликовано: 4 авг 2024
- In this video, we will demonstrate the Hadoop ecosystem and deep dive into the core Hadoop commands, providing clear explanations and practical examples of how to interact with the Hadoop Distributed File System (HDFS) and manage your data effectively.
Next, we will explore MapReduce, a powerful programming model and algorithm that lies at the heart of Hadoop's data processing capabilities. You will learn how to execute MapReduce tasks to process and analyse vast amounts of data in a distributed manner, enabling parallel processing and maximising performance.
Throughout the tutorial, we will walk you through some commands and MapReduce tasks, breaking them down into easy-to-follow steps and explaining the underlying concepts along the way. By the end of this tutorial, you will have a solid understanding of Hadoop commands and MapReduce, empowering you to confidently tackle big data challenges and extract valuable insights from your datasets.
00:00:00 - Introduction
00:00:35 - Launch the hadoop cluster
00:01:26 - Check hadoop cluster from web browser
00:02:00 - Hdfs commands
00:03:04 - Upload a file into hdfs from local
00:04:07 - Upload a folder into hdfs from local
00:04:37 - Run a wordcount program in hadoop
00:05:49 - Java Heap Space Error solve
00:08:23 - copy a file from hdfs to local
00:09:45 - Conclusion
#hadooptutorial #mapreduce #dataengineering #hadoopcommands
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Thank you !!
You're welcome!
Thank you so much, teacher. Please you can dedicated to teach more in Hadoop :) God bless you
More to come!
can you attach files as well
Sir till browse directory its opened but not able find the temp folder or create new folder
I have executed the wordcount successfully, but i am unable to see the application in the cluster , but the output is executed and successfully returned in hdfs path i gave.
what could be the missing element.
Hi, thank you for your tutorial! When I execute the wordcount program, it keeps getting stuck at Map job is 100%, but reduce job is 0%... I installed and configured hadoop from your previous video. Could you please help me with this?
run jps and see the datanode is running or not, if it's not running format namenode and delete all files from tmp file.
++ bhai kase resolve hua???//
Hey, thanks a ton for your videos.
I tried to replicate what you did in this video, but I'm encountering this error when trying to execute wordcount
[2023-07-03 12:20:31.201]Container exited with a non-zero exit code 1. Last 4096 bytes of stderr :
'"C:\Program Files\Java\jdk-11.0.17"' is not recognized as an internal or external command,
operable program or batch file.
Not sure where exactly this is going wrong
java isn't configured properly, install java in different folder where the folder name should not contain any space, try to edit java path with "C:\Program/ Files\Java\jdk-11.0.17" otherwise install java in different folder.
@@IvyProSchool thanks for the response. Didn't expect that to be the issue. Should heed to the warnings from now on.
Also, as of now Map job is 100% done but reduce job is still at 0%, I'm not sure what the exact issue is but I suppose Windows Firewall is not letting the file be transferred from the nodes where the mappers had run to the nodes where the reducer is trying to run.
Hey! I am facing the same issue! Could you please tell me what you did?@@viswanathvankadara4383
sir after running the jar file command i not able to create output file for wordcount it showing map 0% reduce 0% but after that it gave error for exception message '/tmp/hadoop-Ankit' is not recognized as internal or external command not able to found solution I searched it everywhere
Watch the video from 5:50 to solve the memory issue and remove that temporary folder.
when i run start-all.cmd ,the namnode and datanode are not launched
please guide how to resolve this
please format the namenode first then use start-dfs.cmd to start namenodes then start-yarn.cmd to start resource manager.
hey, when i try to run hdfs dfs -ls / command its not showing any tmp file, but my tmp file is creating in the c drive. and even when i check in utilities its not showing any tmp file.
you temporary files isn't created inside of hdfs, it's create on you're local disk drive, so any hdfs command can't show that.
@@IvyProSchool I also fall into this situation ! So is it okay? Is this temporary file important? How can I fix it?
have you fixed it yet ?
where are the practice files
I couldn't find that
Thanks Good Job
they should've provided a link for the files.
These datasets are huge, we can't share them here. If you want some data search in kaggle.com
Hello sir when running mapreduce job it shows error with exception 'tmp/haddop-Rida' is not recognized as intern or extern command, i searched everywhere (stack overflow youtube ...) for solution but no hope
need to see more details go to localhost:8088 then failed job see the error, most probably it's resource issue (CPU, memory), try to run this a simple mapreduce job "hadoop jar C:\hadoop\share\hadoop\mapreduce\hadoop-mapreduce-examples*.jar pi 2 10" if it's still give error delete the tmp folder from c drive and format the namenode again.
Hey was your error solved if it was please tell me how to do it
@@umeranwar8250 sorry nope
Localhost namenode alone is not opening in browser.please help what to do
try to use localhost:50070 or localhost:9870, to access it.
Hi,
First of all thanks for your support.
I followed all the steps as mentioned.
And yes it is working.
But when I execute jps comment it is not returning anything.
Just returning to the comment prompt again with sbin.
Can you plz explain it why?
And my both localhosts are running
Did the problem get solved, or is it still ongoing? Let us know, and we'll be happy to help.
start-yarn.cmd command is not working. what should I do?
Check yarn-site.xml properties from the video.
when i execute the hadoop jar command it show Exception in thread "main" java.lang.UnsupportedOperationException: 'posix:permissions' not supported as initial attribute. is there a solution
Your java path have space, put '\' before space.
@IvyProSchool Where exactly to add '\'before space ? In environment variables in JAVA HOME or in hadoop-env? Can you clarify please ?
@@IvyProSchool Where exactly to add '\'before space ? In environment variables in JAVA HOME or in hadoop-env? Can you clarify please ?
MapReduce jobs get stuck in Accepted state
Please guide how to resolve this
maybe your pc's resource is low, use smaller size of input data.
Bro, when i am running the jps command its showing nothing, and also port 8088 is not running
only local host 9870 is running
Add java jdk bin path in system variable path
Same problem bro
I've added the path , even though it is not working
jar returns me nothing is that normal?
you mean jps. yes, if namenode and datanode working then you're good to go. If you want jps return something Go to Control Panel >> System >> Advanced system settings >> Environment Variables then Click 'Path' from System variables then Click Edit. Now add the path (ex: C:\Java\jdk1.8.0_72\bin) Now open cmd window and write jps. It will work now.
when i execute the hadoop jar command it show Exception in thread "main" java.lang.UnsupportedOperationException: 'posix:permissions' not supported as initial attribute. is there a solution
Hi i am encountering same error. Did you find any solution?
@@vksaisushmitha4203 I changed the version of hadoop 3.2.1 & executed.