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https://issues.apache.org/jira/browse/SOLR-4414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573896#comment-13573896
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Mark Miller commented on SOLR-4414:
-----------------------------------
bq. INFO - 2013-02-07 12:51:51.036;
org.apache.solr.handler.component.MoreLikeThisComponent; MLT: results added for
key: efespphotos531595 documents: {numFound=0,start=0,maxScore=0.0,docs=[]}
This means it's not finding matches on each node - either due to the data or
config, I don't know. I do know it can find matches because I've seen that
happen in tests - I've also matched those results against a single node for
some basic queries.
I've only tested that most basic scenario, because I don't really use the
component and no one offered to test at the time. There is likely some work
required to learn all of it's hills and valleys at the moment. I know it works
at a basic level on tiny data - I don't know how smooth the ride is for
anything real.
> 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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