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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15134365#comment-15134365
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Shai Erera commented on SOLR-8621:
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Thanks [~cpoerschke], I'll review the two commits that you pushed. One quick 
comment/question that I have is about {{SolrIndexConfig}}'s defaultMP class and 
factory names. (1) I think they can be private since they're used only in 
{{SolrIndexConfig}}. Two, I think we can use an instance, rather than class 
name? So that in {{buildMPFromInfo}} we just create a new instance (i.e. {{new 
DefaultMPFactory().getMP()}}). What do you think?

I'll give it another review later.

> solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
> -------------------------------------------------------------------------
>
>                 Key: SOLR-8621
>                 URL: https://issues.apache.org/jira/browse/SOLR-8621
>             Project: Solr
>          Issue Type: Task
>            Reporter: Christine Poerschke
>            Assignee: Christine Poerschke
>
> *<mergePolicyFactory> end-user benefits:*
> * Lucene's UpgradeIndexMergePolicy can be configured in Solr
> * (with SOLR-5730) Lucene's SortingMergePolicy can be configured in Solr
> * customisability: arbitrary merge policies including wrapping/nested merge 
> policies can be created and configured
> *(proposed) roadmap:*
> * solr 5.5 introduces <mergePolicyFactory> support
> * solr 5.5(\?) deprecates (but maintains) <mergePolicy> support
> * solr 6.0(\?) removes <mergePolicy> support 
> +work-in-progress git branch:+ 
> [master-solr-8621|https://github.com/apache/lucene-solr/tree/master-solr-8621]



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