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https://issues.apache.org/jira/browse/LUCENE-2602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898657#action_12898657
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Yonik Seeley commented on LUCENE-2602:
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Great - I meant to add this as a default for solr quite some time ago.
REMINDER (to self mainly, or anyone else willing): need to verify that solr
correctly picks up this default (i.e doesn't accidentally override it).
I know there were related issues like SOLR-1444.
> Default merge policy should take deletions into account
> -------------------------------------------------------
>
> Key: LUCENE-2602
> URL: https://issues.apache.org/jira/browse/LUCENE-2602
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 3.1, 4.0
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
>
> LUCENE-1634 added a calibrateSizeByDeletes; we had a TODO to default this to
> true as of 3.0 but we missed it. I'll fix it now for 3.1 and 4.0. While
> this is technically a change in back-compat (for 3.x), I think it's fine to
> make an exception here; this should be a big win for indices that have high
> doc turnover with time.
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