Fix GCP Pub/Sub Topic Errors
When working with GCP Pub/Sub, you may encounter a configuration error that prevents your data pipeline or messaging system from working. This guide explains the most common mistake with topic and shows the exact fix.
A Common Mistake
Creating a Pub/Sub topic without specifying message retention or schema, using defaults that may not meet requirements.
The incorrect command:
gcloud pubsub topics create my-topic
Error output:
Created topic [my-topic].
Default message retention: 7 days (cannot be changed after creation to less than 7 days without data loss). Default schema: none (no schema validation). Default kms_key: none (no encryption at rest).
The Correct Approach
The right way to configure topic in GCP Pub/Sub:
gcloud pubsub topics create my-topic --message-retention-duration=3d --schema=my-schema --message-encoding=json --kms-key=projects/my-project/locations/global/keyRings/my-keyring/cryptoKeys/my-key
Successful result:
Created topic [my-topic].
Message retention: 3 days.
Schema validation: enabled (JSON schema).
Encryption: CMEK (customer-managed encryption key).
The topic is configured for production use with appropriate security and retention.
How to Prevent This
Plan topic configuration before creation: retention (1-31 days), schema for validation, CMEK for encryption. Retention can only be extended, never shortened without data loss. Enable schema validation for structured data. Use separate topics for different message types.
FAQ
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