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https://issues.apache.org/jira/browse/SOLR-2567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042426#comment-13042426
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Yonik Seeley commented on SOLR-2567:
------------------------------------

bq. the patch currently adjusts the default based on luceneMatchVersion, but 
this is confusing if we release 3.2 that "disagrees" with lucene's actual 3.2 
defaults.

I don't think all of Solr's defaults need to match Lucene's defaults in general 
- we can take it on a case-by-case basis.  In this case, a TieredMergePolicy 
default certainly does make sense.  I'm not even sure it needed to be linked to 
luceneMatchVersion... it's a rare solr user that would depend on the specifics 
of merging or docid behavioral changes.

> Solr should default to TieredMergePolicy
> ----------------------------------------
>
>                 Key: SOLR-2567
>                 URL: https://issues.apache.org/jira/browse/SOLR-2567
>             Project: Solr
>          Issue Type: Bug
>          Components: update
>            Reporter: Robert Muir
>             Fix For: 3.3, 4.0
>
>         Attachments: SOLR-2567.patch, SOLR-2567.patch
>
>
> even if we set a luceneMatchVersion to >= 3.2 (SOLR-2557),
> Solr still defaults to LogByte

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