Google Cloud PostgreSQL

Google Cloud PostgreSQL is a fully-managed database service that helps you set up, maintain, manage, and administer your PostgreSQL relational databases on the Google Cloud platform.

You can ingest data from your Google Cloud PostgreSQL database using Hevo Pipelines and replicate it to a Destination of your choice.

Note: Google Cloud PostgreSQL does not support logical replication. Read the Google Issue for details.

Prerequisites

• IP address or host name of your PostgreSQL server is available.

• The PostgreSQL version is 9.4 or higher.

• Hevo’s IP addresses are whitelisted.

• SELECT, USAGE, and CONNECT privileges are granted to the database user.

• If the Pipeline mode is Logical Replication:

  • Log-based incremental replication is enabled.
  • PostgreSQL database instance is a master instance.

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Perform the following steps to configure your Google Cloud PostgreSQL Source:

Set up Log-based Incremental Replication (optional)

Note: If you are not using Logical Replication, skip this step.

PostgreSQL (version 9.4 and above) supports logical replication by writing additional information to its Write Ahead Logs (WALs).

To configure logical replication:

1. Go to the Google Cloud SQL instance.

2. Click the More icon next to the PostgreSQL instance and click Edit.

   

3. Scroll down to the Flags section.

   

4. Scroll down to the Flags section.

   

5. Click the drop-down next to Flags and then Add Flag.

6. Select all four flags from the drop-down menu. Specify their values as follows:

   Setting	Value
   cloudsql.enable_pglogical	On
   cloudsql.logical_decoding	On
   max_replication_slots	10
   max_wal_senders	10

7. Click Save. The settings you configured are displayed under the Flags section.

   

Whitelist Hevo’s IP Addresses

You need to whitelist the Hevo IP addresses for your region to enable Hevo to connect to your PostgreSQL database. To do this:

1. Access the Google Cloud console and click on your PostgeSQL instance ID.

   

2. In the left navigation pane, click Connections.

3. Select the Public IP check box to activate access on any custom IP address.

   

4. Click Add Network, and include the list of Hevo IP addresses available for your region.

   

5. Repeat the above step for all the network addresses you want to add.

6. Click Save. You can see Hevo’s IP addresses under Authorized networks.

   

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Create a Replication User and Grant Privileges

While using logical replication in Google Cloud PostgreSQL, the user must have the cloudsqlsuperuser role. This role is needed to run the CREATE EXTENSION command.

Create a PostgreSQL user with REPLICATION privileges as follows:

1. Log in to your PostgreSQL database using any SQL client like DataGrip as a super admin and run the following commands:

    CREATE USER replication_user WITH REPLICATION
    IN ROLE cloudsqlsuperuser LOGIN PASSWORD 'secret';
   

   Alternatively, set this attribute for an existing user as follows:

    ALTER USER existing_user WITH REPLICATION;
   

2. Enter the following commands to provide access to the database user:

    GRANT CONNECT ON DATABASE <database_name> TO <database_username>;
    GRANT USAGE ON SCHEMA <schema_name> TO <database_username>;
    GRANT SELECT ON DATABASE <database_name> TO <database_username>;
   

3. Alter the schema’s default privileges to grant SELECT privileges on tables to the database user:

    ALTER DEFAULT PRIVILEGES IN SCHEMA <schema_name>;
    GRANT SELECT ON TABLES TO <database_username>;
   

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Limitations

• The data type Array in the Source is automatically mapped to Varchar at the Destination. No other mapping is currently supported.

• Any column with the UUID data type is not supported as a primary key.