This topic describes the NotifyStrategy parameter that is used to specify a retry policy. The retry policy is applied if an error occurs during message delivery from a Message Service (MNS) topic to an endpoint. You can specify one of the following retry policies when you create a subscription to the topic.
| Retry policy | Description | Parameter |
|---|---|---|
| Backoff retry | Retry for 3 times. The retry interval is a random value between 10 seconds and 20 seconds. | BACKOFF_RETRY |
| Exponential decay retry | Retry for 176 times. The retry interval exponentially increases to 512 seconds, and the total retry period is 1 day. The specific interval of each retry is: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 512... 512 seconds, including 167 retry intervals of 512 seconds in total. | EXPONENTIAL_DECAY_RETRY |