SCBL008

Overview

In this lab, you use Dataflow and Apache Beam to migrate data into Spanner.

Objectives

In this lab, you learn how to:

• Write ETL pipelines using Apache Beam.
• Run Apache Beam piplines using Google Cloud Dataflow.

Setup and Requirements

Before you click the Start Lab button

Read these instructions. Labs are timed and you cannot pause them. The timer, which starts when you click Start Lab, shows how long Google Cloud resources will be made available to you.

This hands-on lab lets you do the lab activities yourself in a real cloud environment, not in a simulation or demo environment. It does so by giving you new, temporary credentials that you use to sign in and access Google Cloud for the duration of the lab.

To complete this lab, you need:

• Access to a standard internet browser (Chrome browser recommended).

• Time to complete the lab. Remember, once you start, you cannot pause a lab.

Activate Cloud Shell

Cloud Shell is a virtual machine that is loaded with development tools. It offers a persistent 5GB home directory and runs on the Google Cloud. Cloud Shell provides command-line access to your Google Cloud resources.

1. Click Activate Cloud Shell at the top of the Google Cloud console.

When you are connected, you are already authenticated, and the project is set to your PROJECT_ID. The output contains a line that declares the PROJECT_ID for this session:

gcloud is the command-line tool for Google Cloud. It comes pre-installed on Cloud Shell and supports tab-completion.

2. (Optional) You can list the active account name with this command:

3. Click Authorize.

4. Your output should now look like this:

Output:

4. (Optional) You can list the project ID with this command:

Output:

Example output:

Task 1. Creating an Apache Beam pipeline to import data into Spanner

1. On the Google Cloud Console title bar, click Activate Cloud Shell (). If prompted, click Continue.

2. Run the following command to set your project ID:

3. Run the following commands to download the files that we will need for this lab:

4. Run the following script to create a Spanner database.

5. Run the following command to see the Schema. In this lab, there is just one table and the PetID and OwnerID fields are both intergers not strings.

6. Run the following command to see the data you import. Notice the primary and foreign keys use counters. As you learned earlier in the course, this is an anti-pattern when using Spanner.
   To solve this, you use a Dataflow pipeline written in Apache Beam to reverse the bits of the intergers prior to importing the data into Spanner.
   This solves the problem of the integers while maintaining the relationships.

7. Click the Open Editor button and open the training-data-analyst/courses/understanding_spanner/dataflow/csv-to-spanner.py code file. Notice the pipeline is created in the main function (lines 53 to 72).

   The pipeline reads from the CSV file, then reverses the bits on the PetID and OwnerID fields, before writing the data to Spanner.
   The reverse_bits function begins at line 21.

8. Return to the terminal. Let's try to run this pipeline. First, you must install the Python prerequisites with the following commands.

9. Run the pipeline. (This code runs the pipeline locally in Cloud Shell. There is no need to navigate to Dataflow. Ignore any deprecation warning if shown.)

10. When the pipeline completes, run the followng query to see the results:

11. Run the following command to remove the data you just added:

Output:

Task 2. Running a Dataflow job

Next, you run the code using the Dataflow service.

1. To run the job using Dataflow, you need a Cloud Storage bucket for inputs, staging, and outputs. Use the command below to create a bucket that contains your Project ID (this should guarantee a unique name for the bucket). Also, copy the pets.csv file into the bucket. Run each of these individually, not together.

2. Navigate to Cloud Storage in the Console and verify that the bucket was created and the file was copied.

3. Run the following commands to ensure that the Dataflow API is enabled cleanly in your project.

4. Run the pipeline using Dataflow with the following command.

5. Use the Navigation menu to go to Dataflow Jobs. It may take a few moments to see the job show up, so click the Refresh button until you see it. Then you can click the job and see the job details. It takes several minutes to run the job in the Dataflow service since it creates a cluster or one or more VMs to submit the job to.

6. As you did before, verify the data was added to your Spanner database. Run the followng query to see the data that was loaded:

7. Delete the Spanner instance so you are no longer being charged for it.

Congratulations! You used Dataflow and Apache Beam to migrate data into Spanner.

End your lab

When you have completed your lab, click End Lab. Your account and the resources you've used are removed from the lab platform.

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