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https://issues.apache.org/jira/browse/LUCENE-1415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638163#action_12638163
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Yonik Seeley commented on LUCENE-1415:
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Good catch Todd, this can be demonstrated in Solr with the example server and
a query of
http://localhost:8983/solr/select/?q=ccc
(ccc has synonyms which end up creating a MultiPhraseQuery)
> MultiPhraseQuery has incorrect hashCode() implementation - Leads to Solr
> Cache misses
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-1415
> URL: https://issues.apache.org/jira/browse/LUCENE-1415
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.4
> Reporter: Todd Feak
>
> I found this while hunting for the cause of Solr Cache misses.
> The MultiPhraseQuery class hashCode() implementation is non-deterministic. It
> uses termArrays.hashCode() in the computation. The contents of that ArrayList
> are actually arrays themselves, which return there reference ID as a hashCode
> instead of returning a hashCode which is based on the contents of the array.
> I would suggest an implementation involving the Arrays.hashCode() method.
> I will try to submit a patch soon, off for today.
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