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https://issues.apache.org/jira/browse/SOLR-4414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586558#comment-13586558
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Colin Bartolome commented on SOLR-4414:
---------------------------------------

By the way, I'm guessing the interesting terms that the query does return, when 
it returns any, are based on the documents contained in that shard only, 
instead of the documents contained in the whole collection. I suppose I can 
live with that, for the time being, but the trick is to query the right shard 
to begin with!
                
> MoreLikeThis on a shard finds no interesting terms if the document queried is 
> not in that shard
> -----------------------------------------------------------------------------------------------
>
>                 Key: SOLR-4414
>                 URL: https://issues.apache.org/jira/browse/SOLR-4414
>             Project: Solr
>          Issue Type: Bug
>          Components: MoreLikeThis, SolrCloud
>    Affects Versions: 4.1
>            Reporter: Colin Bartolome
>
> Running a MoreLikeThis query in a cloud works only when the document being 
> queried exists in whatever shard serves the request. If the document is not 
> present in the shard, no "interesting terms" are found and, consequently, no 
> matches are found.
> h5. Steps to reproduce
> * Edit example/solr/collection1/conf/solrconfig.xml and add this line, with 
> the rest of the request handlers:
> {code:xml}
> <requestHandler name="/mlt" class="solr.MoreLikeThisHandler" />
> {code}
> * Follow the [simplest SolrCloud 
> example|http://wiki.apache.org/solr/SolrCloud#Example_A:_Simple_two_shard_cluster]
>  to get two shards running.
> * Hit this URL: 
> [http://localhost:8983/solr/collection1/mlt?mlt.fl=includes&q=id:3007WFP&mlt.match.include=false&mlt.interestingTerms=list&mlt.mindf=1&mlt.mintf=1]
> * Compare that output to that of this URL: 
> [http://localhost:7574/solr/collection1/mlt?mlt.fl=includes&q=id:3007WFP&mlt.match.include=false&mlt.interestingTerms=list&mlt.mindf=1&mlt.mintf=1]
> The former URL will return a result and list some interesting terms. The 
> latter URL will return no results and list no interesting terms. It will also 
> show this odd XML element:
> {code:xml}
> <null name="response"/>
> {code}

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