File system

Quick Post: Uploading Local Data to Hadoop file system using Hadoop Command Line

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This is a Quick Post, Just want to share a command to upload local data to HDFS using Hadoop Command Line.

The command looks like:

> hadoop fs -copyFromLocal input.txt input/SqrtJob/input.txt

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In the above image, you’ll see that the File Input.txt located at c:hadoopparasdoshidatasets was uploaded to HDFS at input/sqrtjob

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inner workings of HDFS and MapReduce in a nutshell:

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HDFS and MapReduce inner workings in a nutshell.

HDFS MapReduce inner workings

Click on the image to view larger sized image

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Hadoop on Windows: How to Browse the Hadoop Filesystem?

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This Blog post applies to Microsoft® HDInsight Preview for a windows machine. In this Blog Post, we’ll see how you can browse the HDFS (Hadoop Filesystem)?

1. I am assuming Hadoop Services are working without issues on your machine.

2. Now, Can you see the Hadoop Name Node Status Icon on your desktop? Yes? Great! Open it (via Browser)

3. Here’s what you’ll see:

Hadoop File System Browse

4. Can you see the “Browse the filesystem” link? click on it. You’ll see:

hadoop file system name node status windows

5. I’ve used the /user/data lately, so Let me browse to see what’s inside this directory:

user data hadoop sqoop hive mapreduce

6. You can also type in the location in the check box that says Goto

7. If you’re on command line, you can do so via the command:

hadoop fs -ls /

hadoop command line list all files system

And if you want to browse files inside a particular directory:

hadoop command line sqoop mapreduce hdfs file system

Official Resource:

HDFS File System Shell Guide

Conclusion

In this post, we saw how to browse Hadoop File system via Hadoop Command Line & Hadoop Name Node Status

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Microsoft® HDInsight Preview for Windows: How to create a directory in Hadoop File System?

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In this post, we’ll see how to create a directory in the Hadoop File System for HDInsight’s windows version.

Here are the steps:

1. You have the Microsoft® HDInsight Preview for Windows Installed on your machine. Here’s a tutorial: Installing HDInsight (Microsoft’s Hadoop) on windows 7

2. Make sure that the Cluster is up & running! To check this, I click on the “Microsoft HDInsight Dashboard” or open http://localhost:8085/ on my machine

Did you get any “wait for cluster to start..” message? No? Great! Hopefully, all your services are working perfectly and you are good to go now!

3. Let’s start the Hadoop Command Line (can you see the Icon on the Desktop? Yes? Great! Open that!)

4. Here the command to create a directory looks like:

hadoop fs -mkdir /user/data/input

The above command creates /user/data/input

5. Let’s verify that the input directory was created under /user/data

hadoop fs -ls /user/data

hadoop file system list files in a directory create directory

Conclusion:
In this post, we saw how to create a directory in Hadoop (on windows) file system and also we saw how to list files/directory using the -ls command.

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