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https://issues.apache.org/jira/browse/SOLR-5878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940590#comment-13940590
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Erick Erickson commented on SOLR-5878:
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bq: Sorry for not following protocol
NP, we all gotta start somewhere.
You're right, on the surface of it it looks like this is just not working
according to what I would expect from the Wiki page, let's keep this open.
> Solr returns duplicates when using distributed search with group.format=simple
> ------------------------------------------------------------------------------
>
> Key: SOLR-5878
> URL: https://issues.apache.org/jira/browse/SOLR-5878
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.6
> Reporter: J.B. Langston
>
> Solr returns duplicate documents when group.format=simple is supplied on a
> distributed search. This does not happen on the standard group format or when
> not using distributed search.
> For example:
> {code}
> http://localhost:8983/solr/core0/select?shards=localhost:8983/solr/core0,localhost:8983/solr/core1&q=*%3A*&fq=evt_stub%3A(452deed8-c3a2-49a8-878d-8356da315e6a)&start=0&rows=5&fl=cont_stub&wt=xml&indent=true&group=true&group.field=cont_stub&group.format=simple&group.limit=1000
> {code}
> Returns:
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <response>
> <lst name="responseHeader">
> <int name="status">0</int>
> <int name="QTime">253</int>
> </lst>
> <lst name="grouped">
> <lst name="cont_stub">
> <int name="matches">56</int>
> <result name="doclist" numFound="56" start="0" maxScore="1.0">
> <doc>
> <str name="cont_stub">e60eb0f9-bce7-4da9-819c-b356dfc1c4f7</str></doc>
> <doc>
> <str name="cont_stub">e60eb0f9-bce7-4da9-819c-b356dfc1c4f7</str></doc>
> <doc>
> <str name="cont_stub">e60eb0f9-bce7-4da9-819c-b356dfc1c4f7</str></doc>
> <doc>
> <str name="cont_stub">faf0a7ea-4252-4eda-990a-4fcc6b5e63e3</str></doc>
> <doc>
> <str name="cont_stub">faf0a7ea-4252-4eda-990a-4fcc6b5e63e3</str></doc>
> <doc>
> <str name="cont_stub">faf0a7ea-4252-4eda-990a-4fcc6b5e63e3</str></doc>
> <doc>
> <str name="cont_stub">dd94ec0b-f171-441d-8fb8-af6a22ebf168</str></doc>
> <doc>
> <str name="cont_stub">dd94ec0b-f171-441d-8fb8-af6a22ebf168</str></doc>
> <doc>
> <str name="cont_stub">dd94ec0b-f171-441d-8fb8-af6a22ebf168</str></doc>
> <doc>
> <str name="cont_stub">feede138-2fe4-4742-ac63-e7cecfd86c81</str></doc>
> <doc>
> <str name="cont_stub">feede138-2fe4-4742-ac63-e7cecfd86c81</str></doc>
> <doc>
> <str name="cont_stub">feede138-2fe4-4742-ac63-e7cecfd86c81</str></doc>
> <doc>
> <str name="cont_stub">86944a90-033d-4676-9ac3-b59744fc52a5</str></doc>
> <doc>
> <str name="cont_stub">86944a90-033d-4676-9ac3-b59744fc52a5</str></doc>
> <doc>
> <str name="cont_stub">86944a90-033d-4676-9ac3-b59744fc52a5</str></doc>
> <doc>
> <str name="cont_stub">86944a90-033d-4676-9ac3-b59744fc52a5</str></doc>
> </result>
> </lst>
> </lst>
> </response>
> {code}
> It should only return 5 documents. Removing the distributed search and
> searching on either core will return the requested number of rows. Removing
> group.format=simple will also return the requested number of rows.
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