Azure. Documents. Change Feed Processor. Exceptions Namespace
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Exception occurred when lease is lost, that would typically happen when it is taken by another host. Other cases: communication failure, number of retries reached, lease not found.
Exception occurred when an operation in an IChangeFeedObserver is running and throws by user code
General exception occurred during partition processing.
Exception occurred when partition wasn't found.
Exception occurred during partition split.
Exception occurred when all retries on StatusCode.NotFound/SubStatusCode.ReadSessionNotAvaialable are over.