By default, Solr Schema's & Configs don't upgrade properly & may cause
instability
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Key: DS-987
URL: https://jira.duraspace.org/browse/DS-987
Project: DSpace
Issue Type: Bug
Components: Solr
Affects Versions: 1.7.2, 1.7.1, 1.7.0
Environment: Any environment
Reporter: Tim Donohue
Priority: Major
Fix For: 1.8.0
By default, if users run simply 'ant update' to upgrade a DSpace instance, the
Solr Configurations & Schemas will NOT upgrade properly. (Note: However, if
you run 'ant -Doverwrite=true update', then Solr will upgrade properly)
The reason, is that DSpace's Solr directory updates it configurations similar
to the [dspace]/config/ directory.
So, if you simply run 'ant update', all your existing, older Solr Schemas &
Configurations will remain in place unchanged (and new configs/schemas will be
suffixed with ".new", e.g. schema.xml.new). This could cause instability in
DSpace if users are accidentally using an old Solr schemas/configurations with
a new DSpace API.
I think we need to always overwrite existing Solr Schemas & Configurations. If
we want to keep around a copy of older Solr Schemas, they should be suffixed
with "-[date].old" (like when running 'ant -Doverwrite=true update'). As
users are less likely to customize Solr Schemas/Configs (without knowing what
they are doing), I think it's better to default to overwriting these files
during an upgrade.
As it stands, most users will not even realize there are Solr configurations
under [dspace]/solr/search/conf/ and [dspace]/solr/statistics/conf/ which may
not have upgraded properly.
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