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https://issues.apache.org/jira/browse/SOLR-6259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14553507#comment-14553507
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Shingo Sasaki commented on SOLR-6259:
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I think that the bug in multivalue field happened by this fix.
Please read that issue SOLR-7335.
> Performance issue with large number of fields and values when using copyFields
> ------------------------------------------------------------------------------
>
> Key: SOLR-6259
> URL: https://issues.apache.org/jira/browse/SOLR-6259
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.8.1
> Reporter: Steven Bower
> Assignee: Shalin Shekhar Mangar
> Priority: Critical
> Fix For: 4.10, Trunk
>
> Attachments: SOLR-6259.patch
>
>
> When you have schema with a large enough number of fields (in my case around
> 250 fields) and you use copyFields to populate a number of fields (very few
> in my case 3-4) you see a severe degradation in the performance of ingestion.
> Tracking this down using a profiler found that in the lucene
> Document.getField() was using 87% of all CPU time. As it turns out getField()
> does an iteration over the list of fields in the Document returning the field
> if the name matches.. Anyway in the case of copyFields with lots of values
> getField() gets called alot...
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