Hi Alastair, That's definitely not intended and we'll fix it as soon as possible (it will be available in the next release).
Feel free to create a Jira issue on the Apache Solr project with this details (and I'll be able to link it in the Pull Request) Cheers On Wed, 14 Dec 2022, 04:22 Alastair Porter, <alast...@porter.net.nz> wrote: > Hi there, > I'm using solr 9.1 to implement dense vector search using the documentation > at > > https://solr.apache.org/guide/solr/latest/query-guide/dense-vector-search.html > > According to the guide, a valid fieldType configuration is: > > <fieldType name="knn_vector" class="solr.DenseVectorField" > vectorDimension="4" similarityFunction="cosine"/> > > Using the schema API, I added the following configuration: > $ grep knn_vector managed-schema.xml > <fieldType name="knn_vector" class="solr.DenseVectorField" > vectorDimension="4" similarityFunction="euclidean"/> > <field name="vector" type="knn_vector" multiValued="false" > stored="true"/> > > However, when I try to submit a document containing a vector to the server, > an error occurs: > (truncated traceback): > 2022-12-13 19:10:08.763 ERROR (qtp3540494-54) [ x:fsnn] > o.a.s.s.HttpSolrCall org.apache.solr.common.SolrException: null KNN > algorithm is not supported => org.apache.solr.common.SolrException: null > KNN algorithm is not supported > at > > org.apache.solr.core.SchemaCodecFactory$1.getKnnVectorsFormatForField(SchemaCodecFactory.java:134) > org.apache.solr.common.SolrException: null KNN algorithm is not supported > at > > org.apache.solr.core.SchemaCodecFactory$1.getKnnVectorsFormatForField(SchemaCodecFactory.java:134) > ~[?:?] > at > > org.apache.lucene.codecs.lucene92.Lucene92Codec$3.getKnnVectorsFormatForField(Lucene92Codec.java:101) > ~[?:?] > at > > org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat$FieldsWriter.getInstance(PerFieldKnnVectorsFormat.java:148) > ~[?:?] > at > > org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat$FieldsWriter.writeField(PerFieldKnnVectorsFormat.java:107) > ~[?:?] > at > > org.apache.lucene.index.VectorValuesWriter.flush(VectorValuesWriter.java:145) > ~[?:?] > at > org.apache.lucene.index.IndexingChain.writeVectors(IndexingChain.java:461) > ~[?:?] > > After having a dig through the source, I found > https://github.com/apache/solr/pull/910 which added this check. I note > that > the documentation about dense vector search does describe the knnAlgorithm > parameter, but says that it is optional with a default value of "hnsw". > It seems that the patch changed the behaviour of this check to raise an > error if the knnAlgorithm is null/missing, rather than only if the value > isn't the expected "hnsw". > > If I update the fieldType in the schema to include the knnAlgorithm, > hnswMaxConnections, and hnswBeamWidth parameters then I am able to > successfully index and search on this field. > > Does this appear to be a bug in the code? Or if the parameter is expected > to always be set, perhaps a bug in the documentation. > > Thanks, > Alastair >
