DocumentDB allows the partition go into debt but will throttle any subsequent requests.
If the collection is configured with 100 RU/sec allocated per partition. If a write requires 101 RU’s, then the remaining balance will be -1 RU for the remainder of the second. Any requests during the remainder of the second will be asked to retry in 1 second – when the RU balance will come back up to 99 RU’s.
A burst feature may be provided in the future that allows you to overuse your RU allocation, but it will go into a special pricing tier for that period.
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