[SOLR-12676] Improve details on ModelException when the feature of a model has not been defined

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: contrib - LTR
• Assignee: Unassigned
• Reporter: Steven Spasbo
• Created: 17/Aug/18 12:51
• Updated: 15/Feb/21 17:22

Description

While trying to create a model definition, I was getting back the response:

{
  "responseHeader":{
  [...]
  "error":{
    [...]
    "msg":"org.apache.solr.ltr.model.ModelException: Model type does not exist org.apache.solr.ltr.model.LinearModel",
    "code":400}
    }
}

I initially thought this was related to the library, but after a while figured out that I had forgotten to create a feature in my feature store. After creating that the model was created as expected.

To recreate this:

curl -XPOST -H 'Content-Type: application/json' \
-d '{
  "store" : "myStore",
  "name" : "myModel",
  "class" : "org.apache.solr.ltr.model.LinearModel",
  "features" : [{
    "name" : "nonExistentFeature"
  }],
  "params" : {
    "nonExistentFeature" : 1.0
  }
}' http://localhost:8983/solr/$CORE/schema/model-store

Issue Links

• relates to: SOLR-11137 LTR: misleading error message when loading a model
• relates to: SOLR-15149 Learning To Rank model upload fails generically
• relates to: SOLR-12367 When adding a model referencing a non-existent feature the error message is very ambiguous