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https://issues.apache.org/jira/browse/SOLR-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780449#action_12780449
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Mark Miller commented on SOLR-1580:
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Looks like this was dropped a commit or two ago:
r817650 SOLR-1447
Should prob just be reverted to what it was - not sure we need to try and cap
it and it needs the LogMergePolicy check. Though the >0 check makes a bit more
sense to me than != -1.
if (config.mergeFactor != -1 && getMergePolicy() instanceof
LogMergePolicy) {
setMergeFactor(config.mergeFactor);
}
> 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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