How to merge two or more solr search result?

0
votes

I have multiple instances of my application. each application is pointing to its own solr for document indexing.

I am working on a unified search, where user hit a query in the search bar and the relevant documents from all the instance should be ranked based on relevance.

Right now I have implemented a solution based on Round Robin fashion.

For example, I have 2 instances, Ins-1 with solr-1 and Ins-2 with solr-2. Ins-1 has 1K docs and Ins-2 has 5K docs. when I hit any query, the query will fetch X number of docs from solr-1 and X number of docs from solr-2. I am showing those 2X documents in round robin fashion. But it is not a best way to show the search result. I am looking for a solution where I can re-rank those 2X documents based on relevance to the search.

2
searchsolrluceneranking
Are the schema identical on both instances? Are they single cores, or are they cloud instances with collections? – MatsLindh
yes, schema identical on both instances. They are single cores and they are cloud instances with collections. – Sandeep Joshi
@MatsLindh: Any suggestion? – Sandeep Joshi
The regular approach is to create a dummy core, with the same schema, then use manual sharding through the shards parameter to search both cores at the same time as a unified result set. But if you're using cloud mode, that might be hard to coordinate as the number of nodes grow. – MatsLindh
@MatsLindh: Can we re-rank those 2X documents using Lucene API / Solr API or some other algorithm after fetching from different solr? – Sandeep Joshi

2 Answers

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votes

I think you should merge the two instances into single instance. You can import data from one instance to another. Solr Admin UI has a tab 'DataImport' to import data from one collection to another.

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votes

here doc1 and doc2 are two invidual responses from solr you can do it in JAVA 

  SolrDocumentList appendResponse(SolrDocumentList doc1,SolrDocumentList doc2) {
    SolrDocumentList documentsList=new SolrDocumentList();
    for (SolrDocument solrDocument:doc1) 
    { 
            documentsList.add(solrDocument);
    }
    for (SolrDocument solrDocument:doc2) 
    { 
            documentsList.add(solrDocument);
    }

    return documentsList;
}