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https://jira.duraspace.org/browse/DS-987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21660#comment-21660
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Mark Diggory commented on DS-987:
---------------------------------
Ok, well, I understand part of the issue. Your perceiving that we can do
something like solr.bak for the whole solr directory, but this is not the case
becaus, for statistics the data is more like your database and baking it up is
both expensive and will leave the user wondering where their statistics are,
the backup is just for solr/[core]/conf files, not for the solr/[core]/data
directories, which remain untouched.
Using the same algorithm as is used in config for conf directories in solr
assures the config is backed up when the update is run, while the datanis left
in place. It's not always the case that the solr index needs to be rebuilt, and
for the statistics, this rebuilding is very expensive.
> By default, Solr Schemas & Configs don't upgrade properly & may cause
> instability
> ---------------------------------------------------------------------------------
>
> Key: DS-987
> URL: https://jira.duraspace.org/browse/DS-987
> Project: DSpace
> Issue Type: Bug
> Components: Solr
> Affects Versions: 1.7.0, 1.7.1, 1.7.2
> 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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