Erick Erickson created SOLR-4910:
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Summary: 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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