Today Microsoft announced the preview of Change feed Support for Azure Cosmos DB, which allows you to build scalable solutions. By default change feed will be enabled in all the accounts.

Change feed provides an output of sorted list of documents that has been changed in the order in which they are modified by client operations. These changes are persisted, can be processed asynchronously and incrementally, they enables developers to write alternative logic to operate upon these change for generation reports, or invoke another operation such as sending email or audit logs etc.

ChangeFeedProcessor

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