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Atomic update of artifacts and metadata in p2 repository [message #1833407]

Mon, 12 October 2020 12:57

Thorsten Meinl

Messages: 3
Registered: March 2016

Junior Member

In our build system with ~100 p2 repositories we have frequent cases where installing features fails because the p2 directory claims it cannot find the artifact to a feature or bundle. This happens if the corresponding p2 repository has been updated shortly before the installation request (up to one minute). Our p2 repositories are all composite repositories with ~5 children. The composite.jar files get both updated within a fraction of a second (two move commands with the two files), first the artifacts then the metadata. Still the updated metadata seems to be available to the p2 director while the artifacts are not. Installations that run more than a minute after the repository has been updated are able to find the artifacts.
Is there any way to guarantee an atomic update of p2 repositories so that clients see a consistent state?

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Re: Atomic update of artifacts and metadata in p2 repository [message #1833415 is a reply to message #1833407]

Mon, 12 October 2020 14:58

Ed Merks

Messages: 33224
Registered: July 2009

Senior Member

I believe the content metadata is generally read early in the process while doing the resolution to find a solution. The artifact metadata is read later in the processing, i.e., once installation of the resolution proceeds. As such, I don't believe there is anything you can do on the server to make the changes to the repo on the server appear to be atomic as seen by the client. There will always exist that window of time between when the content metadata is read and when the artifact metadata is read.

Ed Merks
Professional Support: https://www.macromodeling.com/

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