Resiliency policies on Dapr Docs

Timeout resiliency policies

Mon, 01 Jan 0001 00:00:00 +0000

Network calls can fail for many reasons, causing your application to wait indefinitely for responses. By setting a timeout duration, you can cut off those unresponsive services, freeing up resources to handle new requests.

Timeouts are optional policies that can be used to early-terminate long-running operations. Set a realistic timeout duration that reflects actual response times in production. If you’ve exceeded a timeout duration:

The operation in progress is terminated (if possible).
An error is returned.

Timeout policy format

spec:
 policies:
 # Timeouts are simple named durations.
 timeouts:
 timeoutName: timeout1
 general: 5s
 important: 60s
 largeResponse: 10s

Spec metadata

Circuit breaker resiliency policies

Mon, 01 Jan 0001 00:00:00 +0000

Circuit breaker policies are used when other applications/services/components are experiencing elevated failure rates. Circuit breakers reduce load by monitoring the requests and shutting off all traffic to the impacted service when a certain criteria is met.

After a certain number of requests fail, circuit breakers “trip” or open to prevent cascading failures. By doing this, circuit breakers give the service time to recover from their outage instead of flooding it with events.

Default resiliency policies

Mon, 01 Jan 0001 00:00:00 +0000

In resiliency, you can set default policies, which have a broad scope. This is done through reserved keywords that let Dapr know when to apply the policy. There are 3 default policy types:

DefaultRetryPolicy
DefaultTimeoutPolicy
DefaultCircuitBreakerPolicy

If these policies are defined, they are used for every operation to a service, application, or component. They can also be modified to be more specific through the appending of additional keywords. The specific policies follow the following pattern, Default%sRetryPolicy, Default%sTimeoutPolicy, and Default%sCircuitBreakerPolicy. Where the %s is replaced by a target of the policy.