Hands-On Exercise 7: debug a multi-node workflow

In this exercise we will see how to debug the workflow described in the exercise a multi-node workflow. To do so, we will be using a specific Web GUI, the “Oozie Web Console”.

Prerequisites

• You have cloned the Hands-On git repository (see Clone the Hands-On repository),
• (Only for python) You have installed the required software (see Prerequisites when using python).

Install the Hands-On

• Install the Hands-On Exercise 7, just type:

cd
cd dcs-hands-on
mvn clean install -D hands.on=7 -P bash

Run the workflow

• Type the following command:

ciop-run

• Press CTRL+C

Warning

The workflow will continue its execution, despite the CTRL+C command.

Debug the workflow

• Open the provided Tracking URL
• Click on the n-node_expression value under the column Name,
• Click on the lens icon,
• Continue debugging as described in Exercice 2: make a robust workflow and debug it,
• Click on the n-node_binning value under the column Name,
• Click on the lens icon,
• Continue debugging as described in Exercice 2: make a robust workflow and debug it.

The following image shows the steps that we have just performed:

Recap

1. We executed a multi-node workflow;
2. We accessed the Oozie Web Console to debug it.