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https://issues.apache.org/jira/browse/SOLR-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780453#action_12780453
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Mark Miller commented on SOLR-1580:
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So the workaround is to use the functionality of SOLR-1447 :)
<mergePolicy class="org.apache.lucene.index.LogByteSizeMergePolicy">
<int name="mergeFactor">3</int>
</mergePolicy>
Possibly why it was taken out? But the example config was not updated to
reflect, so who knows I guess.
> Solr Configuration ignores 'mergeFactor' parameter, always uses Lucene default
> ------------------------------------------------------------------------------
>
> Key: SOLR-1580
> URL: https://issues.apache.org/jira/browse/SOLR-1580
> Project: Solr
> Issue Type: Bug
> Components: update
> Affects Versions: 1.4
> Reporter: Lance Norskog
> Priority: Critical
> Fix For: 1.5
>
> Attachments: SOLR-1580.patch
>
>
> The 'mergeFactor' parameter in solrconfig.xml is parsed by SolrIndexConfig
> but is not consulted by SolrIndexWriter. This parameter controls the number
> of segments that are merged at once and also controls the total number of
> segments allowed to accumulate in the index.
> [IndexWriter.mergeFactor|http://lucene.apache.org/java/2_9_1/api/all/org/apache/lucene/index/IndexWriter.html#getMergeFactor()]
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