Gigi-G/hadoop-quick-start

Docker-Hadoop a fast way to use Hadoop!

Hadoop-Quick-Start

Table of contents

• Start
• Configure Environment
• Use Docker Hadoop
• Scripts
• Example

Start

First of all you have to install docker-hadoop following this guide:
https://clubhouse.io/developer-how-to/how-to-set-up-a-hadoop-cluster-in-docker/

Configure Environment

If you want to configure your environment, you have to follow these steps:

1. Stop the docker containers:

   docker stop historyserver nodemanager1 resourcemanager datanode1 namenode

2. Go to your local big-data-europe/docker-hadoop and modify the docker-compose.yml file adding this two lines under namenode:

   namenode:
   ...                          
         	- <YOUR-LOCAL-PATH>:/home/shared 
   ...

   In you can insert the local directory that contains your hadoop examples.

   An example of docker-compose.yml file is inside ./Examples.

3. Remove the docker containers:

   docker rm historyserver nodemanager1 resourcemanager datanode1 namenode

4. Run this command:

   docker-compose up -d

5. Now you can use your examples with docker!

Use Docker Hadoop

Use this command:

docker exec -it namenode bash

If you are on Ubuntu or you use WSL, you can create an alias of this command adding this line to the file ~/.bashrc:

alias docker-hadoop='docker exec -it namenode bash'

Scripts

• start-docker-hadoop.sh: to start docker hadoop containers;
• stop-docker-hadoop.sh: to start docker hadoop containers.

To use them everywhere follow these steps:

1. Create hadoop-scripts directory in /usr/local:

   sudo mkdir /usr/local/hadoop-scripts

2. Move the Scripts content in /usr/local/hadoop-scripts:

   sudo cp ./Scripts/* /usr/local/hadoop-scripts

3. Change the owner:

   sudo chown -R <your_user>:<your_group> /usr/local/hadoop-scripts

4. Add the execution permission:

   sudo chmod a+x /usr/local/hadoop-scripts/*

5. Add these lines at the end of the file ~/.bashrc:

   export HADOOP_SCRIPTS_HOME=/usr/local/hadoop-scripts
   export PATH=$PATH:$HADOOP_SCRIPTS_HOME

Example

Inside ./handoop directory you can find a simple example called WordCount. First of all, you have to install Maven.

Then you can generate the jar file using the following command:

mvn package

Now you can use it!