Re: [cross-project-issues-dev] weird MPC versions causing grief

[Ed Merks <ed.merks@xxxxxxxxx>]

Stephan,

Having triaged the  ~635 p2 bugs down to < 270, and looking at each report's details, I can see that this is a recurring theme.  No doubt it's aggravated (made more common) by MPC encouraging an update to their latest release, that release being slightly newer than what's on the release train, and that happening right after the release when the server is likely overloaded making network failures even more likely.   I.e., the users see this:

In any case, there is an interesting related observation in this older bug:

  https://bugs.eclipse.org/bugs/show_bug.cgi?id=410721#c3

Inevitably this problem is caused by an inconsistency between the IUs found in the content metadata versus the corresponding artifacts available in the artifact metadata.   There can be a number of possible causes, including inconsistencies in the repos themselves, but that does not appear to be the case with these MPC repos; I inspected the repos and I tried to reproduce the problem, unsuccessfully (even when removing the profile preference for the artifact repository manually).  Another potential cause is that the download.eclipse.org server will continue to serve old cache versions of files that are actually updated in the file system.   So, it's possible that one updates a repository in the file system, and then a client might see a newer version of the compositeContent.jar/content.jar but an older version of the compositeArtifacts.jar/artifacts.jar.   In the above bug, apparently p2 has not recorded the corresponding artifact repository in the profile-scoped preferences for whatever mysterious reason; perhaps a network failure loading the artifact repository and that apparently leads to this same type of problem.   Unfortunately these are generally all scenarios that are very hard to reproduce, but they leave the user scrambling why they have a problem but their team mates do not...

Regards,
Ed

On 20.02.2020 20:32, Stephan Herrmann wrote:

> We've
>       been getting some desperate bug reports about failing
>       installations, all mentioning that mpc artifacts cannot be found.
>       This already happened with version 1.7.7 but today I found some
>       weirdness regarding version 1.8.1:
>       
>       
>       Eclipse fails to update saying:
>       
>       No repository found containing:
>       osgi.bundle,org.eclipse.epp.mpc.core,1.8.1.v20191107-0507
>       
>       No repository found containing:
>       osgi.bundle,org.eclipse.epp.mpc.ui,1.8.1.v20191119-1757
>       
>       No repository found containing:
>       org.eclipse.update.feature,org.eclipse.epp.mpc,1.8.1.v20191119-1757
>       
>       
>       but the published version is actually 1.8.1.v20191106-1317 for all
>       of the above.
>       
>       
>       How did the above versions leak to users, and what can they do to
>       fix their updating?
>       
>       
>       Stephan
>       
>       
>       https://bugs.eclipse.org/bugs/show_bug.cgi?id=548197
>       
>       https://bugs.eclipse.org/bugs/show_bug.cgi?id=551641
>       
>       https://bugs.eclipse.org/bugs/show_bug.cgi?id=560062
>       
>       https://bugs.eclipse.org/bugs/show_bug.cgi?id=560006 (with
>       duplicate)
>       
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