"I have a mind like a steel... uh... thingy." Patrick Logan's weblog.

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Monday, March 05, 2007


Dan Creswell writing again, about "state" this time...

Maintenance of state is a shared responsibility for a system. We should seek to place that responsibility in appropriate places at appropriate times and be much more aware of responsibility boundaries and when it’s appropriate, share that responsibility amongst components.

Generally we consider TCP to be responsible for ensuring that state makes it to the other end of the connection. One hands some data to the TCP layer and we expect that it will ensure the data reaches the recipient. But is this true? What happens if we suffer a power outage before TCP transmits the data? When the machine restarts, is TCP going to restart and resend all that unsent data? Clearly not, whoever delegated responsibility to TCP for this data will now need to take steps to recover the situation.

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Portland, Oregon, United States
I'm usually writing from my favorite location on the planet, the pacific northwest of the u.s. I write for myself only and unless otherwise specified my posts here should not be taken as representing an official position of my employer. Contact me at my gee mail account, username patrickdlogan.