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

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 image,
  • Continue debugging as described in the exercise make a robust workflow and debug it,
  • Click on the n-node_binning value under the column Name,
  • Click on the lens image,
  • Continue debugging as described in the exercise make a robust workflow and debug it.

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

Browse results
Browse results
Browse results

Recap

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