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https://issues.apache.org/jira/browse/SOLR-5205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13819006#comment-13819006
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Markus Jelsma commented on SOLR-5205:
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Shawn, i hadn't noticed bad performance for distributed MLT before until just
now. It looks like that in a 5 shard cluster it fires about 12 queries of which
most are really slow. Doing MLT on a not distributed node with a large amount
of documents is lightning fast! Many of the queries fired are distrib=true.
> MoreLikeThis doesn't escape shard queries
> -----------------------------------------
>
> Key: SOLR-5205
> URL: https://issues.apache.org/jira/browse/SOLR-5205
> Project: Solr
> Issue Type: Bug
> Components: MoreLikeThis
> Affects Versions: 4.4
> Reporter: Markus Jelsma
> Fix For: 4.6
>
> Attachments: SOLR-5205-trunk.patch, SOLR-5205.patch
>
>
> MoreLikeThis does not support Lucene special characters as ID in distributed
> search. ID's containing special characters such as URL's need to be escaped
> in the first place. They are then unescaped and get sent to shards in an
> unescaped form, causing the org.apache.solr.search.SyntaxError exception.
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