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Experimentation suggests Alibaba Cloud API calls are extremely unreliable, with a failure rate around 1%. It is therefore necessary to allow for retrying basically every API call. Some API calls (e.g. DescribeImages or ModifyImageAttribute) are naturally idempotent and so safe to retry. Some non-idempotent API calls (e.g. CopyImage) support explicit idempotence tokens. The remaining API calls may simply fail on a retry, if the original request happened to succeed but failed to return a response. We could write convoluted retry logic around the non-idempotent calls, but this would substantially increase the complexity of the already unnecessarily complex code. For now, we assume that retrying non-idempotent requests is probably more likely to fix transient failures than to cause additional problems. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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