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Cache misses and database failure can be detected by the non-database layers and either reported to the user or worked around using replication.
While this architecture works pretty well in general, it isn't as successful in a chat application due to the high volume of long-lived requests, the non-relational nature of the data involved, and the statefulness of each request.
We chose to simulate the impact of many real users hitting many machines by means of a "dark launch" period in which Facebook pages would make connections to the chat servers, query for presence information and simulate message sends without a single UI element drawn on the page.
With the "dark launch" bugs fixed, we hope that you enjoy Facebook Chat now that the UI lights have been turned on.
The request gets reestablished if it's interrupted or times out.
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The way this is typically accomplished in a web application is by separating the model and the view: data is persisted in a database (perhaps with a separate in-memory cache), with each short-lived request retrieving only the parts relevant to that request.
Because the data is persisted, a failed read request can be re-attempted.