Python Installation
Installing with Vagrant
To get you up and running quickly with Wallaroo, we have provided a Vagrantfile which includes Wallaroo and related tools needed to run and modify a few example applications. We should warn that this Vagrantfile was created with the intent of getting users started quickly with Wallaroo and is not intended to be suitable for production. Wallaroo in Vagrant runs on Ubuntu Linux Xenial.
Set up Environment for the Wallaroo Tutorial
Linux and MacOS
If you haven’t already done so, create a directory called ~/wallaroo-tutorial and navigate there by running:
cd ~/
mkdir ~/wallaroo-tutorial
cd ~/wallaroo-tutorial
This will be our base directory in what follows. Create a directory for the current Wallaroo version and download the Wallaroo Vagrantfile:
mkdir wallaroo-0.6.1
cd wallaroo-0.6.1
mkdir vagrant
cd vagrant
curl -o Vagrantfile -J -L \
https://raw.githubusercontent.com/WallarooLabs/wallaroo/0.6.1/vagrant/Vagrantfile
Windows via Powershell
Note: This section of the guide assumes you are using Powershell.
If you haven’t already done so, create a directory called ~/wallaroo-tutorial and navigate there by running:
cd ~/
mkdir ~/wallaroo-tutorial
cd ~/wallaroo-tutorial
This will be our base directory in what follows. Create a directory for the current Wallaroo version and download the Wallaroo Vagrantfile:
mkdir wallaroo-0.6.1
cd wallaroo-0.6.1
mkdir vagrant
cd vagrant
Invoke-WebRequest -OutFile Vagrantfile `
https://raw.githubusercontent.com/WallarooLabs/wallaroo/0.6.1/vagrant/Vagrantfile
Installing VirtualBox
The Wallaroo Vagrant environment is dependent on the default provider, VirtualBox. To install VirtualBox, download a installer or package for your OS here. Linux users can also use apt-get as documented below.
Linux
sudo apt-get install virtualbox
Installing Vagrant
Linux Ubuntu, MacOS, and Windows
Download links for the appropriate installer or package for each supported OS can be found on the Vagrant downloads page.
Provision the Vagrant Box
Provisioning should take about 10 to 15 minutes. When it finishes, you will have a complete Wallaroo development environment. You won’t have to go through the provisioning process again unless you destroy the Wallaroo environment by running vagrant destroy.
To provision, run the following commands:
cd ~/wallaroo-tutorial/wallaroo-0.6.1/vagrant
vagrant up
What’s Included in the Wallaroo Vagrant Box
Machida: runs Wallaroo Python applications for Python 2.7.
Machida3: runs Wallaroo Python applications for Python 3.5+.
Giles Sender: supplies data to Wallaroo applications over TCP.
Cluster Shutdown tool: notifies the cluster to shut down cleanly.
Metrics UI: receives and displays metrics for running Wallaroo applications.
Wallaroo Source Code: full Wallaroo source code is provided, including Python example applications.
Shutdown the Vagrant Box
You can shut down the Vagrant Box by running the following on your host machine:
cd ~/wallaroo-tutorial/wallaroo-0.6.1/vagrant
vagrant halt
Restart the Vagrant Box
If you need to restart the Vagrant Box you can run the following command from the same directory:
vagrant up
Awesome! All set. Time to try running your first Wallaroo application in Vagrant.
Validate your installation
In this section, we’re going to run an example Wallaroo application. By the time you are finished, you’ll have validated that your environment is set up and working correctly.
There are a few Wallaroo support applications that you’ll be interacting with for the first time:
- Our Metrics UI allows you to monitor the performance and health of your applications.
- Data receiver is designed to capture TCP output from Wallaroo applications.
- Machida or Machida3, our programs for running Wallaroo Python 2.7 and Python 3.5+ applications, respectively.
You’re going to set up our “Alerts” example application. We will use an internal generator source to generate simulated inputs into the system. The data receiver will receive the output, and our Metrics UI will be running so you can observe the overall performance.
The Metrics UI process will be run in the background. The other two processes (data_receiver and Wallaroo) will run in the foreground. We recommend that you run each process in a separate terminal.
For each shell you’re expected to setup, you’d have to run the following to access the Vagrant box:
cd ~/wallaroo-tutorial/wallaroo-0.6.1/vagrant
vagrant ssh
Let’s get started!
Since Wallaroo is a distributed application, its components need to run separately, and concurrently, so that they may connect to one another to form the application cluster. For this example, you will need 4 separate terminal shells to run the metrics UI, run a sink, run the “Alerts” application, and eventually, to send a cluster shutdown command.
Shell 1: Start the Metrics UI
To start the Metrics UI run:
metrics_reporter_ui start
You can verify it started up correctly by visiting http://localhost:4000.
If you need to restart the UI, run:
metrics_reporter_ui restart
When it’s time to stop the UI, run:
metrics_reporter_ui stop
If you need to start the UI after stopping it, run:
metrics_reporter_ui start
Shell 2: Run Data Receiver
We’ll use Data Receiver to listen for data from our Wallaroo application.
data_receiver --listen 127.0.0.1:5555 --no-write --ponythreads=1 --ponynoblock
Data Receiver will start up and receive data without creating any output. By default, it prints received data to standard out, but we are giving it the --no-write flag which results in no output.
Shell 3: Run the “Alerts” Application
First, we will need to set up the PYTHONPATH environment variable. Machida needs to be able to find the the module that defines the application. In order to do that, set and export the PYTHONPATH environment variable like this:
export PYTHONPATH="$HOME/wallaroo-tutorial/wallaroo-0.6.1/examples/python/alerts_stateless:$PYTHONPATH"
Now that we have Machida set up to run the “Alerts” application, and the metrics UI and something it can send output to up and running, we can run the application itself by executing the following command (remember to use the machida3 executable instead of machida if you are using Python 3.X):
machida --application-module alerts \
--out 127.0.0.1:5555 --metrics 127.0.0.1:5001 --control 127.0.0.1:6000 \
--data 127.0.0.1:6001 --name worker-name --external 127.0.0.1:5050 \
--cluster-initializer --ponythreads=1 --ponynoblock
This tells the “Alerts” application that it should write outgoing data to port 5555, and send metrics data to port 5001.
Check Out Some Metrics
Once the application has successfully initialized, the internal test generator source will begin simulating inputs into the system. If you visit the Metrics UI, the landing page should show you that the “Alerts” application has successfully connected.
If your landing page resembles the one above, the “Alerts” application has successfully connected to the Metrics UI.
Now, let’s have a look at some metrics. By clicking on the “Alerts” link, you’ll be taken to the “Application Dashboard” page. On this page you should see metric stats for the following:
- a single pipeline:
Alerts - a single worker:
Initializer - a single computation:
check transaction total
You’ll see the metric stats update as data continues to be processed in our application.
You can then click into one of the elements within a category to get to a detailed metrics page for that element. If we were to click into the check transaction total computation, we’ll be taken to this page:
Feel free to click around and get a feel for how the Metrics UI is set up and how it is used to monitor a running Wallaroo application. If you’d like a deeper dive into the Metrics UI, have a look at our Monitoring Metrics with the Monitoring Hub section.
Shell 4: Cluster Shutdown
You can shut down the cluster with this command at any time:
cluster_shutdown 127.0.0.1:5050
You can shut down Data Receiver by pressing Ctrl-c from its shell.
You can shut down the Metrics UI with the following command:
metrics_reporter_ui stop