Support Document and Search Result clustering
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Key: SOLR-769
URL: https://issues.apache.org/jira/browse/SOLR-769
Project: Solr
Issue Type: New Feature
Reporter: Grant Ingersoll
Assignee: Grant Ingersoll
Priority: Minor
Clustering is a useful tool for working with documents and search results,
similar to the notion of dynamic faceting. Carrot2
(http://project.carrot2.org/) is a nice, BSD-licensed, library for doing search
results clustering. Mahout (http://lucene.apache.org/mahout) is well suited
for whole-corpus clustering.
The patch I lays out a contrib module that starts off w/ an integration of a
SearchComponent for doing clustering and an implementation using Carrot. In
search results mode, it will use the DocList as the input for the cluster.
While Carrot2 comes w/ a Solr input component, it is not the same as the
SearchComponent that I have in that the Carrot example actually submits a query
to Solr, whereas my SearchComponent is just chained into the Component list and
uses the ResponseBuilder to add in the cluster results.
While not fully fleshed out yet, the collection based mode will take in a list
of ids or just use the whole collection and will produce clusters. Since this
is a longer, typically offline task, there will need to be some type of storage
mechanism (and replication??????) for the clusters. I _may_ push this off to a
separate JIRA issue, but I at least want to present the use case as part of the
design of this component/contrib. It may even make sense that we split this
out, such that the building piece is something like an UpdateProcessor and then
the SearchComponent just acts as a lookup mechanism.
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