Amazon Interview Question
Software Engineer / DevelopersCountry: United States
Interview Type: In-Person
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The answer is optimistic concurrency control.
- dr.house April 06, 2014Divide the page into multiple segments. Assign each segment a version number which increments on every update. The list of version numbers is communicated to the clients as well. Before updating a segment, the client gets the latest page and its versions from the server. Updates the page and sends it across to the server along with the versions. If any part of the page is updated, the version on the server would change. If so, reject the clients request along with the latest page and the changed versions.