Re: Solr returning same object in different page
Which version of Solr are you on? Are you using SolrCloud or any distributed search? In that case, I think( as already mentioned by Shawn) this could be related [1] . if it is just plain Solr, my shot in the dark is your boost function : {!boost+b=recip(ms(NOW,field1),3.16e-11,1,1)}{!boost+b=recip(ms(NOW,field2),3.16e-11,1,1)} I see you use NOW ( which changes continuosly). it is normally suggested to round it ( for example NOW/HOUR or NOW/DAY). The rounding granularity depends on the use case. Time passing should not bring any change in ranking ( but it brings change in the score). I can imagine that if for any reason of rounding the score, we end up in having different documents with the same score, then the internal ordinal will be used for ranking them, bringing slightly different rankings. This is very unlikely, but if we are using a single Solr, it's the first thing that jumps to my mind. [1] https://issues.apache.org/jira/browse/SOLR-5821 [2] https://github.com/fguery/lucene-solr/tree/replicaChoice - --- Alessandro Benedetti Search Consultant, R Software Engineer, Director Sease Ltd. - www.sease.io -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
Re: Solr returning same object in different page
On Tue, Sep 12, 2017 at 7:42 PM, rubywrote: > I'm running into a issue where an object is appearing twice when we are > paging. My query is gives documents boost based on field values. First query > returns 50 object. Second query is exactly same as first query, except > getting next 50 objects. We are noticing that few objects which were > returned before are being returned again in the second page. Is this a known > issue with Solr? Are you using paging (page=N) or deep paging (cursorMark=*)? Do you have a deterministic sort order (IE, not simply by score)? Cheers Tom
Re: Solr returning same object in different page
On 9/12/2017 1:35 PM, ruby wrote: > No index change is happening in this case. The duplicate document theory that Jason mentioned is one possibility. If you have a uniqueKey defined in your schema, then duplicates would need to have different uniqueKey values. If you index a document where the uniqueKey field has the same as an existing document, the existing document is deleted. If the index is not changing, and you don't have duplicate documents, then the only way I can imagine that happening is if there are multiple replicas of your collection with different numbers of deleted documents. Deleted documents are still part of the index, so their contents can affect the scores in your query results. When different replicas have different numbers of deleted documents, running the same query more than once when there is load balancing can have different score-based ordering on each of those queries. Multiple replicas with different numbers of deletes is common with SolrCloud, but it is also possible to have it with a non-SolrCloud install, though it probably is less likely. Thanks, Shawn
Re: Solr returning same object in different page
Is it possible that your indexed data contains duplicated or nearly-duplicated documents. (See: https://cwiki.apache.org/confluence/display/solr/De-Duplication) Also, I'm curious whether you see the same duplicates when making a single, larger query. Can you run a single query that returns the number of results normally found in two "pages" of results, and check whether you see duplicates with that single query? On Tue, Sep 12, 2017 at 3:35 PM, rubywrote: > Hi Shawn, > No index change is happening in this case. > > > > -- > Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html >
Re: Solr returning same object in different page
Hi Shawn, No index change is happening in this case. -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
Re: Solr returning same object in different page
On 9/12/2017 12:42 PM, ruby wrote: > I'm running into a issue where an object is appearing twice when we are > paging. My query is gives documents boost based on field values. First query > returns 50 object. Second query is exactly same as first query, except > getting next 50 objects. We are noticing that few objects which were > returned before are being returned again in the second page. Is this a known > issue with Solr? Very likely what's happening is that the index is changing between the query for the first page and the query for the second page. This change puts some new items on that first page, pushing some of the items that used to be on page 1 to page 2. The only absolutely certain way to prevent this would be to never make any changes to the index. Thanks, Shawn
Solr returning same object in different page
I'm running into a issue where an object is appearing twice when we are paging. My query is gives documents boost based on field values. First query returns 50 object. Second query is exactly same as first query, except getting next 50 objects. We are noticing that few objects which were returned before are being returned again in the second page. Is this a known issue with Solr? -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
Solr returning same object in different page
I'm running into a issue where an object is appearing twice when we are paging. My query is gives documents boost based on field values. First query returns 50 object. Second query is exactly same as first query, except getting next 50 objects. We are noticing that few objects which were returned before are being returned again in the second page. Is this a known issue with Solr? -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html