Data Forwarding Stack Policies

Overview

If the forwarding target (such as a third-party application server) cannot process data forwarded by IoTDA in a timely manner due to insufficient performance, unprocessed data will be stacked (cached) on IoTDA. By default, the maximum stack (cache) size of data to forward for a single forwarding rule is 1 GB, and the maximum stack duration is 24 hours. If the maximum stack size or stack duration is exceeded, the earliest unprocessed data will be discarded to meet the stack size and duration requirements.

To control data stacking on IoTDA, you can create stack policies based on specific service scenarios and performance of the forwarding target (for example, a third party application server).

If your service has higher requirements on real-time data than integrity and the performance of the forwarding target is insufficient or the service fails to process forwarded data in a timely manner due to an interruption, a large amount of data will be stacked on IoTDA. As a result, the forwarding target always receives delayed data. You can use a stack policy to configure a small stack size and stack duration. In this way, outdated data will be discarded, and real-time data will be received and processed.

Constraints

You can create one stack policy for an IoTDA instance.

Procedure

1. Access the IoTDA service page and click Access Console.
2. In the navigation pane, choose Rules > Data Forwarding, click Configure Policy, and click Stack Policies.
   Figure 1 Policy configuration page
   

3. In the displayed dialog box, set Policy Name, Description, Stack Size, and Stack Time, and click OK.
   Figure 2 Creating a stack policy
   

   Table 1 Parameters

   Parameter	Description
   Policy Name	The value can contain 4 to 256 characters. Only letters, digits, and special characters (_?'#().,&%@!-) are allowed.
   Description	Description of the policy. The value can contain 4 to 256 characters. Only letters, digits, and special characters (_?'#().,&%@!-) are allowed.
   Stack Size	Maximum stack (cache) size of data to forward in a rule on IoTDA. The unit is byte. The maximum value is 1073741823 bytes (1 GB).
   Stack Time	Maximum stack (cache) duration of data to forward in a rule on IoTDA. The unit is second. The maximum value is 86399 seconds (24 hours).