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AWS Serverless Client Polling Pattern


Client Polling Pattern

Client polling is a standard method for obtaining status information on a long-running transaction.

It allows the client to use message ID to determine if the process is finished or not.


How Client Polling Works

When the process is finished, the step function updates the DynamoDB database with the data and the process state.

When the status "complete" is returned to the client, the client requests the results from the results endpoint.

If nothing changes in the process, the service must answer the client's request every 30 seconds.

It makes this method inefficient.


Advantages and Disadvantages

The table below shows the advantages and disadvantages of the Client Polling Pattern:

Advantages Disadvantages
Synchronous flow is replaced easily Creates additional latency
Adds unnecessary work
Creates a higher cost

Client Polling Pattern Video

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AWS Serverless Exercises

Test Yourself With Exercises

Exercise:

What is Client polling?

Client polling is a standard method for obtaining  information on a long-running transaction.

Start the Exercise