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From "n. alex rupp" <>
Subject Re: [Deployment] Directories
Date Fri, 03 Oct 2003 16:47:25 GMT
I'm not certain we're moving in the right direction with this, Aaron.


> Next, if we want to support the best-case deployment behavior,
> where old requests finish against the old code and new requests go against
> the new code, we need to be able to maintain multiple versions of the same
> application, at least temporarily.

Two questions.
1.  Does the CMP engine already perform version handling for the persistence
2.  Is, therefore, this problem limited to the servlet layer in the

If both of these are true, then I suggest we leave servlet versioning to the
servlet container and associated servlet framework providers.

> Finally, if a JSR-88 application is distributed and deployed
> (without ever going through the normal "deploy" directory routine), and
> the server is restarted, ideally we'd start that application too, even
> though it's not in the deploy dir.
> So all this leads me to the question of what directories do we set
> up for deployments, and how do we populate them?
> I'm thinking that our authoritative location for deployable
> applications should not be the same as the auto-deploy directory.  For
> example, we create the dir "applications", and every time a new app is
> placed in the normal "deploy"  dir, it gets copied to "applications" (with
> a timestamp in the name or something) and unpacked if necessary, and then
> deployed from there.  The JSR-88 logic can dump things directly into
> "applications" when a "distribute" command is received.  When you update
> the copy in the "deploy" dir, it creates a new entry in the "applications"
> dir and kicks off a deployment against that, removing the old one once old
> requests have finished or whatever.  If we have to, we can put a token
> file in the unpacked directory under "applications" indicating the current
> state (distributed, running, stopping, etc.).  When you restart the
> server, we first process all the files in the "deploy" directory, and then
> go on and process everything in the "applications" directory, so we catch
> both the user-updated files and the previous JSR-88 deployments.
> How does that all sound?  Anyone have a better alternative?

I'm not sure we should be copying and shuffling entire archives around.  It
seems like it would be very resource intensive and confusing for the end
user.  Is there another way we could be thinking about this other than
directories in the file system?  I believe the deploy directory is really
just another part of the user interface and that the problems of
classification and deployment should be separated from that UI and handled
under the covers by the server.

N. Alex Rupp

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