Azure Function & Document DB
Yes, it does currently retry on 429, waiting the suggested amount of time as per the DocDB response. There's currently no absolute timeout so the retries will continue until they get through (I'm double-checking right now if this is the expected behavior).
In your first scenario, if you wait long enough for the throttle to be removed, do all 1000 eventually show up?
I'd like to try replicating this -- are you sticking 1000 items in a queue before enabling your function? Or calling it some other way?
The specific retry code that's running is here if you're curious: https://github.com/Azure/azure-webjobs-sdk-extensions/blob/master/src/WebJobs.Extensions.DocumentDB/DocumentDBUtility.cs#L36