[jira] Commented: (SOLR-1580) Solr Configuration ignores 'mergeFactor' parameter, always uses Lucene default

["Mark Miller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780449#action_12780449 ] 

Mark Miller commented on SOLR-1580:
-----------------------------------

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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