Enable synchronous consistency in Reltio Lightspeed

Learn how to configure Lightspeed for synchronous updates to support immediate data consistency in Predicate API reads.

Attention: This feature is available to limited users through the Reltio Early Access (EA) program. Interested in finding out more about this feature or participating in our EA program? Get details in topic Early Access (EA) features.

Note: Reltio Lightspeed is only available on Amazon Web Services (AWS) and Google Cloud Platform (GCP).

You need ROLE_ADMIN_TENANT Access permissions or a custom role with MDM:config.tenant UPDATE permission.

This task helps you configure Reltio Lightspeed™ Data Delivery Network (Reltio Lightspeed) for synchronous index updates that ensure consistent query behavior immediately after writes.

To enable sync index updates:

Configure the physical tenant settings for synchronous consistency.

Note: If you don't have access to update the physical configuration submit a Support request to apply the change.
1. Access your tenant’s physical configuration using the /reltio/tenants/<tenantId> endpoint.
2. Add the following block to the config under predicateAPIConfig:
```
"predicateAPIConfig": {
  "enabled": true,
  "consistency": "strong"
}
        
```
3. Use the PUT Tenant Configuration API operation to save changes.
Configure the L3 settings for synchronous consistency.
1. Override consistency at entity type level in the layer-3 configuration.
  See Apply an L3 to a tenant to apply this configuration:
```
"indexingConfig": {
  "predicateEnabled": true,
  "consistency": "eventual"
}
        
```
To enable synchronous indexing per API request, add strongDDNConsistency to options:
```
POST /entities?options=strongDDNConsistency
        
```

After this setup, write operations will block until the predicate index confirms availability, ensuring strong consistency on Lightspeed API reads.

For reference JSON and configuration hierarchy, see Configuration options for synchronous consistency in Reltio Lightspeed.

Unify and manage your data

Enable synchronous consistency in Reltio Lightspeed

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