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https://issues.apache.org/jira/browse/SOLR-4414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573815#comment-13573815
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Shawn Heisey commented on SOLR-4414:
------------------------------------
I hope it's user error, not a bug. Here's how I've configured my request
handler. The first one is the broker core, the second one is the config on the
shard cores. I have also tried this with the MoreLikeThisComponent in a
regular search handler.
{code}
<requestHandler name="/mlt" class="solr.MoreLikeThisHandler">
<lst name="defaults">
<str name="mlt">true</str>
<str name="mlt.fl">catchall</str>
<str name="mlt.boost">true</str>
<str
name="shards">bigindy5.REDACTED.com:8982/solr/inclive,bigindy5.REDACTED.com:8982/solr/s0live,bigindy5.REDACTED.com:8982/solr/s1live,bigindy5.REDACTED.com:8982/solr/s2live,bigindy5.REDACTED.com:8982/solr/s3live,bigindy5.REDACTED.com:8982/solr/s4live,bigindy5.REDACTED.com:8982/solr/s5live</str>
<str name="shards.qt">/mlt</str>
<str name="echoParams">all</str>
</lst>
</requestHandler>
<requestHandler name="/mlt" class="solr.MoreLikeThisHandler">
<lst name="defaults">
<str name="mlt">true</str>
<str name="mlt.fl">catchall</str>
<str name="mlt.boost">true</str>
<str name="mlt.count">100</str>
<str name="echoParams">all</str>
</lst>
</requestHandler>
{code}
When I send a query to /mlt on the broker core, I get the following. The same
query to /select returns one document.
{code}
<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">0</int>
<lst name="params">
<str name="echoParams">all</str>
<str
name="shards">bigindy5.REDACTED.com:8982/solr/inclive,bigindy5.REDACTED.com:8982/solr/s0live,bigindy5.REDACTED.com:8982/solr/s1live,bigindy5.REDACTED.com:8982/solr/s2live,bigindy5.REDACTED.com:8982/solr/s3live,bigindy5.REDACTED.com:8982/solr/s4live,bigindy5.REDACTED.com:8982/solr/s5live</str>
<str name="mlt.boost">true</str>
<str name="mlt.fl">catchall</str>
<str name="shards.qt">/mlt</str>
<str name="mlt">true</str>
<str name="indent">true</str>
<str name="q">tag_id:efespphotos531595</str>
<str name="wt">xml</str>
</lst>
</lst>
<result name="match" numFound="0" start="0">
</result>
<null name="response"/>
</response>
{code}
Note that if I send the exact same request to the core that contains the
document, I get results. This just involves changing the part of the URL after
/solr, no other changes. Here's the first part of the response. I've left the
actual results out.
{code}
<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">198</int>
<lst name="params">
<str name="echoParams">all</str>
<str name="mlt.count">100</str>
<str name="mlt.boost">true</str>
<str name="mlt.fl">catchall</str>
<str name="mlt">true</str>
<str name="indent">true</str>
<str name="q">tag_id:efespphotos531595</str>
<str name="wt">xml</str>
</lst>
</lst>
<result name="match" numFound="1" start="0">
<doc>
...
{code}
> 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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