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|publisher = Amazon
|author = Yaniv Pessach
|title = Distributed Storage
|edition = Distributed Storage: Concepts, Algorithms, and Implementations
|date = 2013
|ol = 25423189M
}}</ref> Read and write operations on an open file are directed only to the locally cached copy. When a modified file is closed, the changed portions are copied back to the file server. Cache consistency is maintained by [[Callback (computer science)|callback]] mechanism. When a file is cached, the server makes a note of this and promises to inform the client if the file is updated by someone else. Callbacks are discarded and must be re-established after any client, server, or network failure, including a timeout. Re-establishing a callback involves a status check and does not require re-reading the file itself.
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