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https://issues.apache.org/jira/browse/SOLR-4910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678913#comment-13678913
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Shawn Heisey commented on SOLR-4910:
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{quote}
corea is renamed coreb. Is coreb the persisted name?
corea and coreb are swapped, what is persisted?
{quote}
I know a little bit about this, as I use core swapping in conjunction with full
index rebuilds. Here's my opinion. Things that should be persisted any time
there's a change:
* Properties whose value has changed. In the case of a rename or swap, that
would be the core name(s).
* Properties that are explicitly stated in solr.xml or the core.properties that
is being overwritten.
* Properties whose default value will be different in a future version of Solr.
Except as described in the list above, I don't think that unspecified defaults
should be written. When I took my solr.xml from 3.5.0 and put it on
4.1-SNAPSHOT, I suddenly had new data in my solr.xml after a core swap, the
settings for LotsOfCores. I don't think that should have been written, because
it wasn't there in the first place.
> solr.xml persistence is completely broken
> -----------------------------------------
>
> Key: SOLR-4910
> URL: https://issues.apache.org/jira/browse/SOLR-4910
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.0, 4.4
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Blocker
>
> I'm working on SOLR-4862 (persisting a created core doesn't preserve some
> values) and at least compared to 4.3 code, persisting to solr.xml is
> completely broken.
> I learned to hate persistence while working on SOLR-4196 & etc. and I'm glad
> it's going away. I frequently got lost in implicit properties (they're easy
> to persist and shouldn't be), what should/shouldn't be persisted (e.g. the
> translated ${var:default} or the original), and it was a monster, so don't
> think I'm nostalgic for the historical behavior.
> Before I dive back in I want to get some idea whether or not the current
> behavior was intentional or not, I don't want to go back into that junk only
> to undo someone else's work.
> Creating a new core (collection2 in my example) with persistence turned on in
> solr.xml for instance changes the original definition for collection1 (stock
> 4.x as of tonight) from this:
> <core name="collection1" instanceDir="collection1" shard="${shard:}"
> collection="${collection:collection1}" config="${solrconfig:solrconfig.xml}"
> schema="${schema:schema.xml}"
> coreNodeName="${coreNodeName:}"/>
> to this:
> <core loadOnStartup="true" shard="${shard:}" instanceDir="collection1/"
> transient="false" name="collection1" dataDir="data/"
> collection="${collection:collection1}">
> <property name="name" value="collection1"/>
> <property name="config" value="solrconfig.xml"/>
> <property name="solr.core.instanceDir" value="solr/collection1/"/>
> <property name="transient" value="false"/>
> <property name="schema" value="schema.xml"/>
> <property name="loadOnStartup" value="true"/>
> <property name="solr.core.schemaName" value="schema.xml"/>
> <property name="solr.core.name" value="collection1"/>
> <property name="solr.core.dataDir" value="data/"/>
> <property name="instanceDir" value="collection1/"/>
> <property name="solr.core.configName" value="solrconfig.xml"/>
> </core>
> So, there are two questions:
> 1> what is correct for 4.x?
> 2> do we care at all about 5.x?
> As much as I hate to say it, I think that we need to go back to the 4.3
> behavior. It might be as simple as not persisting in the <property> tags
> anything already in the original definition. Not quite sure what to put where
> in the newly-created core though, I suspect that the compact <core + attribs>
> would be best (assuming there's no <property> tag already in the definition.
> I really hate the mix of attributes on the <core> tag and <property> tags,
> wish we had one or the other....
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