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https://issues.apache.org/jira/browse/SOLR-4414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13984261#comment-13984261
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Simone Gianni commented on SOLR-4414:
-------------------------------------
Managed to work around this bug using the TermVectorComponent (which is
properly sharded) to fetch term vectors and adapting the query generation code
in Lucene's MoreLikeThis component to create the MLT query client side. It's
two calls (one for the term vectors and then one to perform the MLT query), but
it works and is totally sharded.
Just a hint on how to eventually work it around.
> 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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