Re: [jboss-as7-dev] Graceful Shutdown

The idea is that existing permit holders (which includes already-running requests, already-open transactions, etc.) can still get new permits, but those who do not already have a transaction running or open sessions or whatever cannot and should be redirected to another node. On 09/16/2011 09:12 AM, Scott Marlow wrote: > Is this a fail-fast design? Or should all currently running user > requests succeed? If new transactions cannot be started, I would think > that means some running user requests will fail. > > > On 09/13/2011 10:31 AM, David M. Lloyd wrote: >> We've worked out the rough outline of how graceful shutdown will work in >> AS7. >> >> The process of graceful shutdown actually is reflected by a number of >> states: >> >> 1. Running - all services acting normally >> 2. Suspending - services refuse new "permits" (see below), existing >> permits are allowed to be retained (and threads running under such a >> permit may still acquire new permits) >> 3. Suspended - no permits are present and none may be issued >> 4. Shutting Down - our existing server stop process >> >> The following transitions are allowed: >> >> 1. Running → Suspending: Transition occurs at user request (to suspend >> or gracefully shut down). >> 2. Suspending → Suspended: Transition occurs when all permits are >> cleared. >> 3. Suspending → Running: Transition occurs at user request (to exit >> suspend mode or cancel graceful shutdown before it completes). >> 4. Suspended → Running: Transition occurs at user request (to exit >> suspend mode). >> 5. Suspended → Shutting Down: Transition occurs automatically (if a >> graceful shutdown was requested) or at user request (if a shut down >> request of any kind is entered in the Suspended state). >> 6. Running → Shutting Down: Transition occurs at user request (to shut >> down the server "un-gracefully"). >> >> These "permits" are issued by the "Shutdown Manager", whose job is to >> manage these states. They are issued corresponding to the following >> events: >> >> 1. The invocation of an EJB method >> 2. The creation of a web session >> 3. A creation of a transaction >> 4. Probably some situations involving HQ and/or JCA >> >> When a permit cannot be issued due to the server shutting down, a >> standard exception message should be produced so that the user can see a >> familiar error message regardless of what mechanism is used to access >> the server. >> > -- - DML _______________________________________________ jboss-as7-dev mailing list jboss-as7-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-as7-dev