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Update AWS provider documentation regarding batch size options

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Megum1n 2023-12-21 02:52:48 +01:00
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docs/tutorials/aws.md
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@ -982,3 +982,19 @@ An effective starting point for EKS with an ingress controller might look like:
--domain-filter=example.com
--aws-zones-cache-duration=1h
```
### Batch size options
After external-dns generates all changes, it will perform a task to group those changes into batches. Each change will be validated against batch-change-size limits. If at least one of those parameters out of range - the change will be moved to a separate branch. If the change can't fit into any batch - *it will be skipped.*<br>
There are 3 options to control batch size for AWS provider:
* Maximum amount of changes added to one batch
* `--aws-batch-change-size` (default `1000`)
* Maximum size of changes in bytes added to one batch
* `--aws-batch-change-size-bytes` (default `32000`)
* Maximum value count of changes added to one batch
* `aws-batch-change-size-values` (default `1000`)
`aws-batch-change-size` can be very useful for throttling purposes and can be set to any value.
Default values for flags `aws-batch-change-size-bytes` and `aws-batch-change-size-values` are taken from [AWS documentation](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DNSLimitations.html#limits-api-requests) for Route53 API. **You should not change those values until you really have to.** <br>
Because those limits are in place, `aws-batch-change-size` can be set to any value: Even if your batch size is `4000` records, your change will be split to separate batches due to bytes/values size limits and apply request will be finished without issues.