What should be done when the provisioned throughput is exceeded?

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Yes.

Every time your application sends a request that exceeds your capacity you get ProvisionedThroughputExceededException message from Dynamo. However your SDK handles this for you and retries. The default Dynamo retry time starts at 50ms, the default number of retries is 10, and backoff is exponential by default.

This means you get retries at:

  • 50ms
  • 100ms
  • 200ms
  • 400ms
  • 800ms
  • 1.6s
  • 3.2s
  • 6.4s
  • 12.8s
  • 25.6s

If after the 10th retry your request has still not succeeded, the SDK passes the ProvisionedThroughputExceededException back to your application and you can handle it how you like.

You could handle it by increasing throughput provision but another option would be to change the default retry times when you create the Dynamo connection. For example

new AWS.DynamoDB({maxRetries: 13, retryDelayOptions: {base: 200}});

This would mean you retry 13 times, with an initial delay of 200ms. This would give your request a total of 819.2s to complete rather than 25.6s.

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