There's no currently available method to identify process and machine. Your best bet is random id generated during module initialization.
On Nov 22, 9:46 pm, Andy Freeman <[EMAIL PROTECTED]> wrote: > > os.getpid isn't available > > Thanks. > > > nor unique across processes. > > Huh? During the life of a process A on a machine B, no other process > on B will have the same process id as A. > > Two different processes on a given machine may have the same id if > their lifetimes are disjoint and two processes on different machines > may have the same process id at the same time, but the latter is just > why some sort of machine identifier is important. > > On Nov 22, 5:43 pm, yejun <[EMAIL PROTECTED]> wrote: > > > UUID should be ok, which use system urandom as seed by default. > > os.getpid isn't available nor unique across processes. > > > On Nov 22, 8:07 pm, "David Symonds" <[EMAIL PROTECTED]> wrote: > > > > On Sun, Nov 23, 2008 at 8:50 AM, Andy Freeman <[EMAIL PROTECTED]> wrote: > > > >> > Suppose that I want to atomically create an entity group with two > > > >> > nodes, one the parent of the other. > > > >> But *why* exactly do you want to do this? > > > > > Because I want "a set of one or more entities that can be manipulated > > > > in a single transaction. Entity group relationships tell App Engine to > > > > store several entities in the same part of the distributed network. A > > > > transaction sets up datastore operations for an entity group, and all > > > > of the operations are applied as a group, or not at all if the > > > > transaction fails." > > > > Yes, I understand transactions and entity groups. Why do you need to > > > create an entity group *atomically*? > > > > > The fact that GAE uses many machines and concurrently is why the full > > > > hostname, IP, or MAC address or some other machine identifier is > > > > useful in creating a unique identifier on GAE. (If my application > > > > always ran on the same machine, the process id and time would be > > > > sufficient.) > > > > If you create a new entity, it will automatically be assigned a unique > > > key at the datastore level. What's wrong with just using that? > > > > Dave.- Hide quoted text - > > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
