On Wed, Apr 6, 2011 at 9:30 AM, Tim Allen <screwt...@froup.com> wrote:
> On Wed, Apr 06, 2011 at 10:16:03AM +0300, anatoly techtonik wrote: > > From http://twistedmatrix.com/documents/current/core/howto/udp.html > > > > """As you can see, the protocol is registered with the reactor. This > means it > > may be persisted if it's added to an application...""" > > > > What does 'persisted` here mean? > > At some point in the past, somebody decided it would be a great idea to > have Twisted's "twistd" start applications from Python pickles; you > could start up a server, configure it interactively, and when you shut > it down the entire server state would be persisted in a pickle-file; > when you started it up it would resume exactly as it had been when you > shut it down. > Whoa hang on. Without trying to hijack the thread, this is the entire premise of infobarb, the IRC bot I'm building for #python-*, except s/pickle/sqlite/, so if this is a horrible idea I'd like to know before I build it. > > The idea seems to have fallen from grace, possibly because restarting > a process is often the simplest way to resolve a production problem. > These days, new Twisted users are encouraged to use Python ".tac" files > rather than ".tap" pickles, and I expect that sentence is just a relic > of that bygone era. > I suppose the problem you're suggesting is that the pickle is in a state where running the server is impossible: do you mean like the pickle is corrupted, or pickle has a bunch of settings that just can't work... ? Would this problem be fixed by implementing features like differential snapshots? Maybe a replayable or reverse-replayable event log? cheers lvh
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