On Nov 28, 2011, at 16:35 PM, Carsten Ziegeler wrote: > 2011/11/27 Marcel Offermans <marcel.offerm...@luminis.nl>: >> >> I guess this is a difference between ACE (or rather deployment packages) and >> the Sling installer. If you have an application installed and there is an >> update for bundles A, B and C (and we assume there is a bug in B) then ACE >> will: >> >> Start a transaction, install A, install B, discover that that fails and >> rollback B and A to end up in the original situation again. >> >> And from what I understand, Sling will: >> >> Install A, install B, discover that that fails, install C, and then keeps >> retrying B. >> >> My concern is that probably, with only A and C installed, the overall >> application will not work that well, whereas if you roll all changes back, >> the chances of ending up with an application that works are a lot better. > > Yes, that's a basic difference - but as long as you're using > deployment packages with the Sling installer, you're fine. So your > deployment package contains bundles A, B and C and if installation of > B fails, the deployment package installation is stopped/rolled back.
True! > The only difference is, Sling tries to reinstall the deployment > package. Actually, I forgot to explicitly mention that, but the default behavior of the ACE management agent is the same, it will periodically keep retrying. > If you're using single bundles which are installed directly, you're right. > >> Yes. As soon as you allow more than one version of a bundle to be installed >> at the same time, you end up with problems because you cannot identify in >> the case of an update, which is an update of which. This, in my opinion, is >> a "bug" in the OSGi specification, especially now that the 4.3 spec will >> even allow you to install the same version multiple times. Luckily, in real >> life, this situation rarely occurs (appearantly). > Yepp, when it comes to bundles, the Sling installer does not allow to > install the same bundle in different versions (based on the symbolic > name of the bundle) Out of interest, did you ever run into issues with this in practice? Greetings, Marcel
