NOW AVAILABLE: Fedora 4.7.3 Release

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David Wilcox

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Jun 9, 2017, 9:18:04 AM6/9/17
to Fedora Tech, Fedora Community, Islandora Community, Hydra Community, Fedora Leaders
Release date: June 7, 2017

We are proud to announce the release of Fedora 4.7.3.


NOTE: If you are running a 4.7.1 or 4.7.2 instance of Fedora that had been upgraded from a previous version (4.7.0 or earlier), and you do not believe it has ever been shut down since upgrading to 4.7.1 or 4.7.2,  you MUST make a backup via fcr:backup immediately.  To recover from this bug, take a backup (which will be corrupted in a particular way), fix the backup, and restore into an instance of 4.7.3.  All users should take a backup of their Fedora instance before upgrading to 4.7.3 just to be safe.

Full release notes are included below, and can also be found on the wiki: https://wiki.duraspace.org/display/FF/Fedora+4.7.3+Release+Notes

Resources

Team

Release Manager

Developers

Issue Reporters

Summary

The Fedora 4.7.3 release is a backwards compatible refinement of the previous release, which fixes a namespace-corrupting bug that has the effect of Fedora being unable to successfully start after having been shut down. 

Detailed Bug Remediation Notes

Who is affected

This occurs when all the following conditions are true:

  1. An earlier version of Fedora had been used to create objects, before upgrading to 4.7.1 and 4.7.2
  2. One of the objects created in the repository prior to upgrade to 4.7.1 or 4.7.2 contains a triple using one or more of the following namespaces, and the prefix does NOT match the one shown:
    7. config: info:fedoraconfig/

For example, if an object prior to upgrade to Fedora 4.7.1 or 4.7.2 looked like the following, it would be OK since the prefix matches the above table:

@prefix skos:  <http://www.w3.org/2004/02/skos/core#> .
  
<> skos:prefLabel “foo” .

On the other hand, if an object prior to the upgrade to 4.7.1 or 4.7.2 looked like this, it will cause the namespace corrupting bug:

@prefix ns004:  <http://www.w3.org/2004/02/skos/core#> .
  
<> ns004:prefLabel “foo” .

Viewing the objects in a running 4.7.1 or 4.7.2 instance is insufficient for determining if this bug affects you, as the prefixes that you are shown will not necessarily match the prefixes originally present in the object. If you have any objects containing triples whose predicate or object contains one of the above namespaces, you are at risk.

What is the problem

Fedora 4.7.1 and 4.7.2 added some global, hard-coded namespaces and prefixes to the fedora-node-types.cnd file.  Any existing namespaces that conflict with these new hard-coded namespaces are deleted/overwritten when Fedora exits.  This results in an inconsistent Modeshape database.  The repository will function in this inconsistent state until a re-started is attempted, which will fail.

How to fix the issue

At a high-level you need to: 

  1. Take a backup
  2. Fix the backup manually
  3. Restore the backup into a new repository

Since it is somewhat difficult to determine if your repository is truly affected, a reasonable upgrade plan from 4.7.1 or 4.7.2 to 4.7.3 is:

  1. Take a backup
  2. Try simply upgrading 4.7.3 over the existing repository.  If it starts up successfully, you are not affected by the issue, and are done!
  3. If Fedora 4.7.3 fails to start, then you need to fix the backup manually, and restore into an empty repository

Detailed instructions

Please see the release notes on the wiki for detailed instructions.
Pddd

Changes

Complete Listing of Resolved Tickets

FC

--
David Wilcox
Fedora Product Manager
DuraSpace
dwi...@duraspace.org





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