Google Pub/Sub (Cohort Sync)

Amplitude Data's Google Pub/Sub Cohort integration lets you stream your cohort membership updates straight to a Pub/Sub topic.

Considerations

• This integration is only available for customers who have paid plans with Amplitude.
• You must enable this integration for each Amplitude project you want to use it in.
• You should have an understanding of Amplitude Activation and Behavioral Cohorts before setting up this integration.
• Cohort updates can be sent via all the supported cadences (Daily, Hourly, Real Time).
• All the existing Real Time Cohort Sync limits apply here.

Payload

The payload sent to Pub/Sub is a JSON object. Example:

{
  "cohort_name": "Test Cohort",
  "cohort_id": "gs72ns",
  "in_cohort": true,
  "computed_time": "1685748245",
  "message_id": "some-message-id:54",
  "users": [{
    "user_id": "user1@amplitude.com"
    },
    {
      "user_id": "user2@amplitude.com"
    }]
}

• cohort_name: String. the name of the audience
• cohort_id: String. the unique ID of the audience, which can also be found in URL when viewing it on Amplitude
• in_cohort: Boolean. Indicating this batch of users is “entering” or “exiting” an audience. Each message will only have one of either state but not both.
• compute_time: String. The Epoch timestamp when we re-compute the audience in Amplitude. Due to the nature of Kinesis streaming, it’s impossible to enforce order upon receiving the message. The team can leverage this to resume the order.
  • We kept it as a string rather than a number because depending on the programming language/platform the team is using, a JSON number can be interpreted as a float and lose precision.
• message_id: String. The unique id of each message.
• users: List. The users batch. Each user will be represented as a JSON object
  • user_id: String. the id of the user

Setup

Prerequisites

Before you get started, create a topic in Pub/Sub, and a Google IAM service account.

Amplitude needs two things from Pub/Sub to set up the integration:

• Pub/Sub topic name: The name of the topic, not the full name in the google cloud. See the Google Pub/Sub documentation for help with this step.
• Google service account key: You should create a dedicated service account for Amplitude Pub/Sub integration. See the Google documentation for help with this step.

Google Pub/Sub Setup

After you create your topic and service role, you must add the service account as a principle for the topic you created. For more detailed instructions for this step, see the Google documentation.

1. Open the topic.
2. In the Permissions tab, click Add Principal.
3. Add the service account's name.
4. Select Pub/Sub Publisher as the role.

Now, create a key for the service account. You need this to complete Amplitude setup. See the Google documentation for help with this step.

Amplitude setup

1. In Amplitude Data, click Catalog and select the Destinations tab.
2. In the Cohort section, click on Google Pub/Sub.
3. Click Add another destination.
4. Enter the Display Name for this destination. This is just a name to identify the destination when syncing the cohort.
5. Enter the pub/sub topic id.
6. Upload the service account key in the .json format based on the above setup.
7. Save the destination.

This will create the destination for cohorts to be synced to.

Syncing Cohort Updates

1. In Amplitude, open the cohort you want to export.
2. Click Sync, and choose Google Pub/Sub.
3. Select the destination created above.
4. Select the sync frequency you need.