cache_policy - Composite topics

Sets the cache policy for the composite topic. Cache policies are defined at the model level using the cache_policies parameter.

Syntax

cache_policy: <policy_name>

Properties

string

The name of a cache policy defined in the model file. Must reference a policy from the model’s cache_policies configuration.

Behavior

When cache_policy is unset, the composite topic resolves its effective cache policy to the shortest max_cache_age among its sub-topics. This ensures the composite is never served staler than its strictest member.

Examples

Explicit cache policy

cache_policy: daily_cache_policy

Default resolution behavior

If cache_policy is unset, the composite uses the shortest max_cache_age from its component topics:

# Composite topic with no explicit cache_policy
topics:
  - orders_topic        # has cache_policy: hourly_cache (max_cache_age: 1 hour)
  - marketing_topic     # has cache_policy: daily_cache (max_cache_age: 24 hours)
  - support_topic       # no cache_policy, falls back to model's default_cache_policy

# The composite resolves to the shortest max_cache_age (1 hour from orders_topic)

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cache_policy - Composite topics

Syntax

Properties

Behavior

Examples

Explicit cache policy

Default resolution behavior

​Syntax

​Properties

​Behavior

​Examples

​Explicit cache policy

​Default resolution behavior

Syntax

Properties

Behavior

Examples

Explicit cache policy

Default resolution behavior