Chris M. Hostetter created SOLR-16203:
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Summary: Using SPI lookups of analysis components results in
factories that don't get ResourceLoaderAware.inform called on them (When using
ClassicIndexSchemaFactory)
Key: SOLR-16203
URL: https://issues.apache.org/jira/browse/SOLR-16203
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 9.0
Reporter: Chris M. Hostetter
Ok ... this is a weird one ...
SOLR-13593 modified {{FieldTypePluginLoader}} to add the ability for analysis
Factories to be resolved by SPI name (ex: {{{}name="stop"{}}}, instead of by
"short class name" (ex: {{{}class="solr.StopFilterFactory"{}}}.
The code that deals with this just calls (for example)
{{TokenFilterFactory.forName(name, params);}} and uses the resulting factory
"as is" – But these means that nothing calls the {{inform(ResourceLoader)}} on
any factories that implement {{ResourceLoaderAware}} (such as
{{StopFilterFactory}} or {{{}SynonymGraphFilterFactory{}}})
In the "short class name" code path (the only option prior to 9.0), the
{{SolrResourceLoader}} is used to initialize the Factory, and
{{SolrResourceLoader..newInstance(...)}} takes responsibility of calling
{{factory.inform(this)}} on everything it instantiates that implements
{{ResourceLoaderAware}} (as well as some other checks: like
{{{}SolrCoreAware{}}})
This discrepancy means that when using the {{name="foo"}} syntax, many
factories won't be fully initialized – or fail on invalid input – during schema
initialization. In the case of things like {{StopFilterFactory}} or
{{SynonymGraphFilterFactory}}) the problem will manifest as some type of
runtime error when the factory's {{create(...)}} method is called as part of
creating a new index or query Analyzer.
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_*...BUT...*_
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This problem only seems to manifest itself when using
{{ClassicIndexSchemaFactory}} -- which is why it's not readily apparent when
using the default configset, or something like {{bin/solr -e techproducts}}
(but is trivial to reproduce in testcases (since almost every "test" solrconfig
uses {{ClassicIndexSchemaFactory}})
I have no idea _why_ using {{ManagedIndexSchemaFactory}} doesn't manifest the
same problem -- it should be using the same {{FieldTypePluginLoader}} under the
covers -- but clearly something specific to {{ManagedIndexSchema}} is taking
responsibility for calling {{ResourceLoaderAware.inform(...)}}
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